Mercedes C220/280 (202) – E280/320 (124) – S320 (140) – SL320 (129) (1993 – 2000) OBD1 Codes

Model:	C220/280 (202) E280/320 (124) S320 (140) SL320 (129)
Year:	1993-00
Engine identification:	104.941/942/943/944/945/991/994/995, 111.920/921/940/941/9421944/945/946/960/961/970/974/975
System:	Bosch HFM Bosch HFM-SFI Siemens PMS

General information

Trouble codes are displayed by using an LED connected to the data link connector (DLC).
The ECM fault memory can also be checked using diagnostic equipment connected to the data link connector (DLC).
Diagnostic equipment can also be used to erase data from ECM fault memory.
More detailed fault diagnosis information can be obtained using diagnostic equipment connected to the data link connector (DLC).

Accessing – flash codes ->02/95

Ensure ignition switched OFF.
Jump data link connector (DLC) terminals 1 and 4 or 1 and 8 with a switched lead – contacts normally open [1] or [2].
Connect LED test lamp between terminals 3 and 4 or 8 and 16 [1] or [2]

NOTE: Connect LED test lamp positive connection to terminal 3 or 16.

Switch ignition ON.
Operate switch for 2-4 seconds.
Count LED flashes. Note trouble code.
Trouble codes consist of short flashes [3].
For example: Trouble code 3 displayed [3].
Repeat operation. Note trouble codes. Compare with trouble code table.
Switch ignition OFF.

Erasing – flash codes

Ensure ignition switched OFF.
Jump data link connector (DLC) terminals 1 and 4 or 1 and 8 with a switched lead – contacts normally open [1] or [2].
Connect LED test lamp between terminals 3 and 4 or 8 and 16 [1] or [2].

NOTE: Connect LED test lamp positive connection to terminal 3 or 16.

Switch ignition ON.
Operate switch for 2-4 seconds.
Operate switch for 5-6 seconds – Bosch ECM –>08/93.
Allow LED to display trouble code.
Operate switch for 6-8 seconds.
Operate switch for 8-9 seconds – Bosch ECM –>08/93.
Repeat operation to erase all stored trouble codes.
After erasing trouble code 1: Switch ignition OFF.
Wait 2 seconds.
Switch ignition ON.
Wait 10 seconds minimum.
Start engine.

Trouble code identification

Flash code	Fault location	Probable cause
1	No fault found	–
2	Engine coolant temperature (ECT) sensor – electrical fault	Wiring, connector, ECT sensor, ECM
3	Intake air temperature (IAT) sensor – electrical fault	Wiring, connector, IAT sensor, ECM
4	Bosch HFM: Mass air flow (MAF) sensor- range/performance problem	Wiring, connector, intake leak, MAF sensor, ECM
4	Siemens PMS: Manifold absolute pressure (MAP) sensor – vacuum leak	Hoses, ECM
5	Idle speed control (ISC) actuator – malfunction	Wiring, connector, ISC actuator
6	Throttle position (TP) sensor – range/ performance problem	Wiring, connector, TP sensor, ECM
7	Idle speed control (ISC) actuator- malfunction	Wiring, connector, ISC actuator, ECM
8	Idle speed control (ISC) – malfunction	Wiring, connector, intake leak, MAF sensor, throttle valve tight/sticking
90	Heated oxygen sensor (H02S) 1 – range/ performance problem	Wiring, connector, H02S
10	Heated oxygen sensor (H02S) 2- range/ performance problem	Wiring, connector, H02S
11	Oxygen sensor heater 1 – electrical fault	Wiring, connector, H02S, ECM
12	Oxygen sensor heater 2 – electrical fault	Wiring, connector, H02S, ECM
13	Lambda regulation – system too lean/rich	Wiring, intake/exhaust leak, MAF sensor, fuel pressure, injector(s}, ECM
14	Bosch HFM: Injector 1 – circuit malfunction	Wiring, injector, ECM
14	Siemens PMS: Injector 1 & 4 – circuit malfunction	Wiring, injector, ECM
15	Bosch HFM: Injector 2 – circuit malfunction	Wiring, injector, ECM
15	Siemens PMS: Injector 2 & 3 – circuit malfunction	Wiring, injector, ECM
16	Injector 3 – circuit malfunction	Wiring, injector, ECM
17	Injector 4 – circuit malfunction	Wiring, injector, ECM
18	Injector 5 – circuit malfunction	Wiring, injector, ECM
19	Injector 6 – circuit malfunction	Wiring, injector, ECM
20	Bosch HFM: Fuel trim (FT), idle speed -range/ performance problem	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
20	Siemens PMS: Fuel trim (FT) – range/ performance problem	Intake/exhaust leak, injector(s), fuel pressure, H02S, EVAP system, ECM
21	111: Ignition amplifier/ignition coil, cylinder 1 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
21	104: Ignition amplifier/ignition coil, cylinder 1 & 6 – defective	Wiring, ignition amplifier, ignition coil, ECM
22	Bosch HFM: Ignition amplifier 1/ignition coil, cylinder 1 – defective	Wiring, ignition amplifier, ignition coil, ECM
22	Siemens PMS: Ignition amplifier/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
22	104: Ignition amplifier/ignition coil, cylinder 2 & 5 – defective	Wiring, ignition amplifier, ignition coil, ECM
23	111: Ignition amplifier 2/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
23	104: Ignition amplifier/ignition coil, cylinder 3 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
24	Crankshaft position (CKP) sensor – malfunction	Wiring, air gap, flywheel ring gear damaged, CKP sensor
25	Camshaft position (CMP) sensor – incorrect signal	Wiring, CMP sensor
26	Engine control module (ECM) coding plug – electrical fault	Wiring, ECM
27	Engine control module (ECM), RPM signal – output	Wiring, RPM sensor, ECM
28	ABS control module/engine control module (ECM) communication – VSS signal	Wiring, VSS, ABS control module trouble code(s) stored
29 f)	Intake manifold heater relay – malfunction	Wiring, intake manifold heater relay, ECM
30	Fuel pump relay- defective	Wiring, fuel pump relay
31	Without cat: CO adjustment resistor – malfunction	Wiring, CO adjustment resistor, ECM
32	Knock sensor(s) (KS)- defective	Wiring, KS
33	Ignition timing, knocking – maximum retardation reached	Fuel contamination, mechanical fault
34	Engine control module (ECM), knock control – internal fault	ECM
35	Secondary air injection (AIR) pump/relay – malfunction	Wiring, AIR pump/relay, ECM
36	Evaporative emission (EVAP) canister purge valve – electrical fault	Wiring, EVAP canister purge valve, hose(s), ECM
37	Transmission shift control valve – electrical fault	Wiring, transmission shift control valve
38	Camshaft position (CMP) actuator – malfunction	Wiring, mechanical fault, CMP actuator, ECM
39	Exhaust gas recirculation (EGR) solenoid – malfunction	Wiring, EGR solenoid, hose(s)
40	Transmission overload protection switch – malfunction	Wiring, transmission overload protection switch
41	CAN data bus, ECM – malfunction	Wiring, ECM
42	111: CAN data bus, diagnostic module – malfunction	Wiring
42	104: CAN data bus – malfunction	Wiring
43	Engine control module (ECM), pin 50 – starter signal	Wiring
45	With cruise control system: Cruise control, inertia fuel shut-off (IFS) switch -active	Wiring, TP sensor, idle speed control (ISC) actuator
46	Intake manifold air control solenoid – malfunction	Wiring, intake manifold air control solenoid, ECM
48	Oxygen sensor heater relay 2 – electrical fault	Wiring, oxygen sensor heater relay, ECM
49	Engine control module (ECM) – supply voltage	Wiring, ignition switch, overvoltage protection relay
50	Engine control module (ECM) – internal fault	ECM

Accessing and erasing – scanner codes

The engine control module (ECM) fault memory can only be accessed and erased using diagnostic equipment connected to the data link connector (DLC).

Trouble code identification

Scan code	Fault location	Probable cause
–	No fault found	–
2	Engine coolant temperature (ECT) sensor – short circuit	Wiring, connector, ECT sensor, ECM
3	Engine coolant temperature (ECT) sensor – open circuit	Wiring, connector, ECT sensor, ECM
4	Engine coolant temperature (ECT) sensor- range/performance problem	–
5	Engine coolant temperature (ECT) sensor – plug connection(s)	Multi-plug(s)
6	Intake air temperature (IAT) sensor- short circuit	Wiring, connector, IAT sensor, ECM
7	Intake air temperature (IAT) sensor- open circuit	Wiring, connector, IAT sensor, ECM
8	Intake air temperature (IAT) sensor- plug connection(s)	Multi-plug(s)
9	Bosch HFM: Mass air flow (MAF) sensor- range/performance problem	Wiring, connector, intake leak, MAF sensor
9	Siemens PMS: Manifold absolute pressure (MAP) sensor – vacuum leak	Hoses, ECM
10	Bosch HFM: Mass air flow (MAF) sensor- open circuit	Wiring, connector, MAF sensor, ECM
10	Siemens PMS: Manifold absolute pressure (MAP) sensor – vacuum leak	Hoses, ECM
11	Idle speed control (ISC) actuator- range/ performance problem	Wiring, connector, ISC actuator
12	Idle speed control (ISC) actuator- circuit malfunction	Wiring, connector, ISC actuator
13	Bosch HFM: Idle speed control (ISC) actuator- plug connection(s)	Multi-plug(s)
13	Siemens PMS: Throttle position (TP) sensor- range/performance problem	Wiring, connector, TP sensor, ECM
14	Throttle position (TP) sensor – signal high	Wiring, connector, TP sensor, ECM
15	Throttle position (TP) sensor – signal low	Wiring, connector, TP sensor, ECM
16	Bosch HFM: Throttle position (TP) sensor – plug connection(s)	Multi-plug(s)
16	Siemens PMS: Idle speed control (ISC) actuator – malfunction	Wiring, connector, ISC actuator, ECM
17	Idle speed control (ISC) actuator – signal high	Wiring, connector, ISC actuator, ECM
18	Idle speed control (ISC) actuator – signal low	Wiring, connector, ISC actuator, ECM
19	Bosch HFM: Idle speed control (ISC) actuator – plug connection(s)	Multi-plug(s)
19	Siemens PMS: Idle speed control (ISC) – malfunction	Wiring, connector, intake leak, MAF sensor, throttle valve tight/sticking
20	Idle speed control (ISC) – lower limit reached	Wiring, connector, intake leak, MAF sensor, throttle valve tight/sticking
21	Idle speed control (ISC) – upper limit reached	Wiring, connector, intake leak, MAF sensor, throttle valve tight/sticking
22	Cruise control/idle speed control (ISC) actuator – limp-home mode	Wiring, ISC actuator, throttle valve tight/ sticking
22	Siemens PMS: Heated oxygen sensor (H02S) 1 – range/performance problem	Wiring, connector, H025
23	Heated oxygen sensor (H02S) 1 -voltage high	Wiring, connector, H02S
24	Heated oxygen sensor (H02S) 1 – open circuit	Wiring, connector, H02S
25	Bosch HFM: Heated oxygen sensor (H02S) 1 – range/performance problem	Wiring, connector, H02S
25	Siemens PMS: Oxygen sensor heater 1 – electrical fault	Wiring, connector, H02S, ECM
26	Bosch HFM: Heated oxygen sensor (H02S) 2 – voltage high	Wiring, connector, H02S
26	Siemens PMS: Oxygen sensor heater 1 – electrical fault	Wiring, connector, H025, ECM
27	Bosch HFM: Heated oxygen sensor (H02S) 2 – open circuit	Wiring, connector, H02S
27	Siemens PMS: Oxygen sensor heater 1 – electrical fault	Wiring, connector, H02S, ECM
28	Bosch HFM: Heated oxygen sensor (H02S) 2 – range/performance problem	Wiring, connector, H02S
28	Siemens PMS: Lambda regulation – system too lean	Wiring, intake/exhaust leak, MAF sensor, fuel pressure, injector(s), ECM
29	Bosch HFM: Oxygen sensor heater- current low	Wiring, connector, H02S, ECM
29	Siemens PMS: Lambda regulation – system too rich	Wiring, intake/exhaust leak, MAF sensor, fuel pressure, injector(s), ECM
30	Bosch HFM: Oxygen sensor heater- current high	Wiring, connector, H02S, ECM
30	Siemens PMS: Injector 1 & 4 – circuit malfunction	Wiring, injector, ECM
31	Bosch HFM: Oxygen sensor heater – short circuit	Wiring, connector, H02S, ECM
31	Siemens PMS: Injector 1 & 4 – circuit malfunction	Wiring, injector, ECM
32	Bosch HFM: Oxygen sensor heater 2 – current low	Wiring, connector, H02S, ECM
32	Siemens PMS: Injector 2 & 3 – circuit malfunction	Wiring, injector, ECM
33	Bosch HFM: Oxygen sensor heater 2 -current high	Wiring, connector, H02S, ECM
33	Siemens PMS: Injector 2 & 3 – circuit malfunction	Wiring, injector, ECM
34	Bosch HFM: Oxygen sensor heater 2 – short circuit	Wiring, connector, H02S, ECM
34	Siemens PMS: Fuel trim {FT) – range/ performance problem	Intake/exhaust leak, injector(s), fuel pressure, H02S, EVAP system, ECM
35	Lambda regulation – system too lean	Wiring, intake/exhaust leak, MAF sensor, fuel pressure, injector(s), ECM
36	Lambda regulation – system too rich	Wiring, intake/exhaust leak, MAF sensor, fuel pressure, injector(s), ECM
37	Injector 1 – short to positive	Wiring short to positive, injector, ECM
38	Bosch HFM: Injector 1 – open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
38	Siemens PMS: Ignition amplifier/ignition coil, cylinder 1 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
39	Bosch HFM: Injector 2 – short to positive	Wiring short to positive, injector, ECM
39	Siemens PMS: Ignition amplifier/ignition coil, cylinder 1 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
40	Bosch HFM: Injector 2 – open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
40	Siemens PMS: Ignition amplifier/ignition coil, cylinder 1 & 4 – defective	Wiring, ignition amplifier, ignition ;oil, ECM
41	Bosch HFM: Injector 3- short to positive	Wiring short to positive, injector, ECM
41	Siemens PMS: Ignition amplifier/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
42	Bosch HFM: Injector 3 – open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
42	Siemens PMS: Ignition amplifier/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
43	Bosch HFM: Injector 4 – short to positive	Wiring short to positive, injector, ECM
43	Siemens PMS: Ignition amplifier/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
44	Bosch HFM: Injector 4 – open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
44	Siemens PMS: Crankshaft position (CKP) sensor – malfunction	Wiring, air gap, flywheel ring gear damaged, CKP sensor
45	111: Crankshaft position (CKP) sensor- malfunction	Wiring, air gap, flywheel ring gear damaged, CKP sensor
45	104: Injector 5- short to positive	Wiring short to positive, injector, ECM
46	111: Crankshaft position (CKP) sensor – malfunction	Wiring, air gap, flywheel ring gear damaged, CKP sensor
46	104: Injector 5- open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
47	111: Engine control module (ECM) coding plug – electrical fault	Wiring, ECM
47	104: Injector 6- short to positive	Wiring short to positive, injector, ECM
48	111: Engine control module (ECM) coding plug – electrical fault	Wiring, ECM
48	104: Injector 6- open circuit/short to ground	Wiring open circuit/short to ground, injector, ECM
49	Bosch HFM: Fuel trim (FT), idle speed – mixture rich	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
49	Siemens PMS: Engine control module (ECM), RPM signal – output/short to ground	Wiring short to ground, RPM sensor
50	Bosch HFM: Fuel trim (FT), idle speed – mixture lean	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
50	Siemens PMS: Engine control module (ECM), RPM signal – output/short to positive	Wiring short to positive, RPM sensor
51	Bosch HFM: Fuel trim (FT), lower part load – mixture rich	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
51	Siemens PMS: ABS control module/engine control module (ECM) communication – VSS signal	Wiring, VSS, ABS control module trouble code(s) stored
52	Bosch HFM: Fuel trim (FT), lower part load – mixture lean	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
52	Siemens PMS: ABS control module/engine control module (ECM) communication – VSS signal	Wiring, VSS, ABS control module trouble code(s) stored
53	Fuel trim (FT), upper part load – mixture rich	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
053 0	Intake manifold heater relay – malfunction	Wiring, intake manifold heater relay, ECM
54	Fuel trim (FT), upper part load – mixture lean	Intake/exhaust leak, injector(s), fuel pressure, H02S, ECM
054 0	Intake manifold heater relay – malfunction	Wiring, intake manifold heater relay, ECM
55	Bosch HFM: Ignition amplifier 1/ignition coil, cylinder 1 – misfire	Wiring, ignition amplifier, ignition coil, ECM
55	Siemens PMS: Fuel pump relay – defective	Wiring, fuel pump relay
55	104: Ignition amplifier 1/ignition coil, cylinder 2 – misfire	Wiring, ignition amplifier, ignition coil, ECM
56	Bosch HFM: Ignition amplifier 1/ignition coil, cylinder 4 – misfire	Wiring, ignition amplifier, ignition coil, ECM
56	Siemens PMS: Fuel pump relay – defective	Wiring, fuel pump relay
56	104: Ignition amplifier 1/ignition coil, cylinder 5 – misfire	Wiring, ignition amplifier, ignition coil, ECM
57	Bosch HFM: Ignition amplifier 1/ignition coil, cylinder 1 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
57	Siemens PMS: CO adjustment resistor – malfunction	Wiring, CO adjustment resistor, ECM
57	104: Ignition amplifier 3/ignition coil, cylinder 2 & 5 – defective	Wiring, ignition amplifier, ignition coil, ECM
58	Bosch HFM: Ignition amplifier 2/ignition coil, cylinder 2 – misfire	Wiring, ignition amplifier, ignition coil, ECM
58	Siemens PMS: CO adjustment resistor – malfunction	Wiring, CO adjustment resistor, ECM
58	104: Ignition amplifier 2/ignition coil, cylinder 3 – misfire	Wiring, ignition amplifier, ignition coil, ECM
59	Bosch HFM: Ignition amplifier 2/ignition coil, cylinder 3 – misfire	Wiring, ignition amplifier, ignition coil, ECM
59	Siemens PMS: Evaporative emission (EVAP) canister purge valve – electrical fault	Wiring, EVAP canister purge valve, hose(s), ECM
59	104: Ignition amplifier 2/ignition coil, cylinder 4 – misfire	Wiring, ignition amplifier, ignition coil, ECM
60	Bosch HFM: Ignition amplifier 2/ignition coil, cylinder 2 & 3 – defective	Wiring, ignition amplifier, ignition coil, ECM
60	Siemens PMS: Evaporative emission (EVAP) canister purge valve – electrical fault	Wiring, EVAP canister purge valve, hose(s), ECM
60	104: Ignition amplifier 2/ignition coil, cylinder 3 & 4 – defective	Wiring, ignition amplifier, ignition coil, ECM
61	111: Short term fuel trim (FT), idle speed/part load – malfunction	Fuel system
61	104: Ignition amplifier 3/ignition coil, cylinder 1 – misfire	Wiring, ignition amplifier, ignition coil, ECM
62	111: Transmission shift control valve- electrical fault	Wiring, transmission shift control valve
62	104: Ignition amplifier 3/ignition coil, cylinder 6 – misfire	Wiring, ignition amplifier, ignition coil, ECM
63	111: Engine control module (ECM) – supply voltage	Wiring, connector, fuse, ignition switch, central locking control module, engine control relay
63	104: Ignition amplifier 3/ignition coil, cylinder 1 & 6 – defective	Wiring, ignition amplifier, ignition coil, ECM
64	Bosch HFM: Crankshaft position (CKP) sensor – signal	Wiring, air gap, flywheel ring gear damaged, CKP sensor
64	Siemens PMS: Central locking control module, immobilizer signal – open circuit/short to positive	Wiring, central locking control module, trouble code(s) stored in other system(s)
65	Bosch HFM: Crankshaft position (CKP) sensor – defective	Wiring, air gap, flywheel ring gear damaged, CKP sensor
65	Siemens PMS: Central locking control module, immobilizer signal – open circuit/short to ground	Wiring, central locking control module, trouble code(s) stored in other system(s)
66	Bosch HFM: Crankshaft position (CKP) sensor – range/performance problem	Wiring, air gap, flywheel ring gear damaged, CKP sensor
66	Siemens PMS: Attempt to start engine while central locking still activated	Erase fault memory, trouble code(s) stored in other system(s)
67	Bosch HFM: Camshaft position (CMP) sensor – incorrect signal	Wiring, CMP sensor
67	Siemens PMS: Central locking control module, immobilizer signal – plausibility	Wrong central locking control module
68	Engine control module (ECM) coding plug – short to ground	Wiring short to ground, ECM
69	Engine control module (ECM) coding plug – open circuit/short to positive	Wiring open circuit/short to positive, ECM
70	Engine control module (ECM), RPM signal – output/short to ground	Wiring short to ground, RPM sensor
71	Engine control module (ECM), RPM signal – output/short to positive	Wiring short to positive, RPM sensor
72	ASS control module/engine control module (ECM) communication, VSS signal – signal not recognised	Wiring, VSS, ABS control module trouble code(s) stored
73	ABS control module/engine control module (ECM) communication, VSS signal – signal high	Wiring, VSS, ABS control module trouble code(s) stored
074 fJ	Intake manifold heater relay – short to positive	Wiring short to positive, intake manifold heater relay, ECM
075 fJ	Intake manifold heater relay – open circuit/short to ground	Wiring open circuit/short to ground, intake manifold heater relay, ECM
76	Fuel pump relay – defective	Wiring, fuel pump relay
77	Without cat: CO adjustment resistor – short to positive	Wiring short to positive, CO adjustment resistor, ECM
78	Without cat: CO adjustment resistor – malfunction	Wiring, connector(s), CO adjustment resistor, ECM
79	Knock sensor(s) (KS) 1 -open circuit	Wiring, KS
80	Knock sensor(s) (KS) 2- open circuit	Wiring, KS
81	Ignition timing, knocking – maximum retardation reached	Fuel contamination, mechanical fault
82	Ignition timing, knocking – firing angle between cylinders	Fuel contamination, mechanical fault
83	111: Secondary air injection (AIR) pump/relay – malfunction	Wiring, AIR pump/relay, ECM
83	104: Engine control module (ECM), knock control – internal fault	ECM
84	Short term fuel trim (FT), max. value – idle speed/part load	Fuel system, ECM
85	Secondary air injection (AIR) pump/relay – malfunction	Wiring, AIR pump/relay, ECM
86	Evaporative emission (EVAP) canister purge valve – open/short circuit	Wiring, AIR pump/relay, ECM
87	Evaporative emission (EVAP) canister purge valve – short to positive	Wiring short to positive, AIR pump/relay, ECM
88	Transmission shift control valve – electrical fault	Wiring, transmission shift control valve
89	Camshaft position (CMP) actuator – short to positive	Wiring, CMP actuator, ECM
90	Camshaft position (CMP) actuator- open circuit/short to ground	Wiring, CMP actuator, ECM
91	Exhaust gas recirculation (EGR) solenoid – short to positive	Wiring short to positive, EGR solenoid, hose(s)
92	Exhaust gas recirculation (EGR) solenoid – open circuit/short to ground	Wiring open circuit/short to ground, EGR solenoid, hose(s)
93	Transmission overload protection switch – short to ground	Wiring short to ground, transmission overload protection switch
94	Transmission overload protection switch – switch closed	Wiring, transmission overload protection switch
95	Transmission overload protection switch – switch open	Wiring, transmission overload protection switch
96	Transmission overload protection switch – plausibility	Wiring, transmission overload protection switch
97	CAN data bus, ECM – malfunction	Wiring, ECM
98	CAN data bus, ASR system – malfunction	Wiring
99	CAN data bus, cruise control system/TP control module – malfunction	Wiring
100	CAN data bus, diagnostic module – malfunction	Wiring
101	Engine control module (ECM), pin 50 – starter signal	Wiring
104	With AT/cruise control system: Cruise control, inertia fuel shut-off (IFS) switch – active	Wiring, TP sensor, idle speed control (ISC) actuator
105	Intake manifold air control solenoid – short to positive	Wiring, intake manifold air control solenoid, ECM
106	Intake manifold air control solenoid – open circuit/short to ground	Wiring, intake manifold air control solenoid, ECM
107	Ignition amplifier – malfunction	Wiring, ignition amplifier, ignition coil(s), ECM
108	Oxygen sensor heater relay 2 – short to positive	Wiring short to positive, oxygen sensor heater relay, ECM
109	Oxygen sensor heater relay 2 – open circuit/ short to ground	Wiring open circuit/short to ground, oxygen sensor heater relay, ECM
110	Engine control module (ECM) -supply voltage, plausibility	Wiring, ignition switch, overvoltage protection relay
111	Engine control module (ECM)- supply voltage low	Wiring, ignition switch, overvoltage protection relay
112	Engine control module (ECM) – internal fault	ECM
113	Engine control module (ECM) – coding	Not coded
114	Engine control module (ECM) – identification	ECM not coded, ECM
115	Engine control module (ECM) – coding	Not coded, ECM
116	CAN data bus, remote central locking – malfunction	Wiring
116	Bosch HFM 06/93 -+: Engine control module (ECM) – supply voltage low	Wiring, connector, fuse, overvoltage protection relay
117	Attempt to start engine while central locking still activated	Erase fault memory, trouble code{s) stored in other system(s)
118	Supercharger (SC) – malfunction	Wiring, mechanical fault, hose(s), intake air flap control actuator, ECM
119	Supercharger (SC) clutch – open circuit/short to ground	Wiring open circuit/short to ground, SC clutch, ECM
120	Electronic traction control (ETC) – signal	Wiring short to ground, ETC module
123	Intake air flap control actuator, supercharger (SC) – malfunction	Wiring open circuit/short to ground, intake air flap control actuator, ECM
124	Intake air flap control actuator, supercharger (SC) – malfunction	Wiring short to positive, intake air flap control actuator, ECM
125	Engine control module (ECM) – internal fault	ECM
126	Engine control module (ECM) – internal fault	ECM
127	Idle speed control (ISC) actuator/ISC actuator, cruise control system – malfunction	Wiring, ISC actuator, ISC actuator – cruise control system
128	Engine control module (ECM) – internal fault	ECM
129	Engine control module (ECM) – internal fault	ECM
130	Throttle position (TP) sensor – malfunction	Wiring, TP sensor, ECM
131	Engine control module (ECM) – internal fault	ECM
132	Engine control module (ECM) – internal fault	ECM
133	Idle speed control (ISC) actuator – defective	Wiring, ISC actuator
134	Engine control module (ECM) – internal fault	ECM
135	Idle speed control (ISC) actuator – supply voltage	Wiring, ECM
136	Idle speed control (ISC) actuator – defective	Wiring, ISC actuator, ECM
137	Engine control module (ECM) – internal fault	ECM
138	Idle speed control (ISC) actuator – defective	Wiring, ISC actuator
139	Cruise control selector switch – defective	Wiring, cruise control selector switch
140	Engine control module (ECM) – internal fault	ECM
141	Engine control module (ECM) – internal fault	ECM
142	Engine control module (ECM) – internal fault	ECM
143	Brake pedal position (BPP) switch, cruise control system – defective	Wiring, BPP switch
144	Engine control module (ECM) – internal fault	ECM
145	CAN data bus, VSS signal, rear axle – malfunction	Wiring, trouble code(s) stored in other system(s)
146	CAN data bus, VSS signal, front axle – malfunction	Wiring, trouble code(s) stored in other system(s)
147	CAN data bus, AIC – malfunction	Wiring, A/C control module trouble code(s) stored
148	Starter motor relay – short to positive	Wiring, ignition switch, ECM
149	Starter motor relay – short to ground	Wiring, ignition switch, ECM
150	CAN data bus, AT – malfunction	Wiring, TCM trouble code(s) stored
151	CAN data bus, AIC – malfunction	Wiring, AIC control module trouble code(s) stored
152	CAN data bus – malfunction	Wiring
153	Engine coolant blower motor/A/C condenser blower motor – short to positive	Wiring, ECT sensor, A/C control module, ECM
154	Engine coolant blower motor/AIC condenser blower motor – short to ground	Wiring, ECT sensor, AJC control module, ECM
155	Transmission control module (TCM) – coding	Incorrectly coded
156	CAN data bus, ABS/ETC – plausibility	Wiring, trouble code(s) stored in other system(s)
157	CAN data bus, ABS/ETC – plausibility	Wiring, trouble code(s) stored in other system(s)
158	CAN data bus, ABS – plausibility	Wiring, ABS control module trouble code(s) stored

Accessing and erasing – OBO-II codes

The engine control module (ECM) fault memory can only be accessed and erased using diagnostic equipment connected to the data link connector (DLC).

Trouble code identification

OBD-11 code	Fault location	Probable cause
PO,P2,UO	Refer to OBD-11 trouble code tables	–
P1131	Heated oxygen sensor (H02S) 1 – signal/ electrical fault	Wiring, H02S
P1132	Heated oxygen sensor (H02S) control 1 – system too rich	Intake/exhaust leak, H02S
P1137	Heated oxygen sensor (H02S) 2 – signal/ electrical fault	Wiring, H02S
P1138	Heated oxygen sensor (H02S) 2 – range/ performance problem	Wiring, H02S
P1170	Short term fuel trim (FT) – malfunction	Intake/exhaust leak, injector(s), fuel pressure, MAF sensor
P1335	Engine speed (RPM) sensor – signal	Wiring, ECM
P1336	Crankshaft position (CKP) sensor – signal	Wiring, air gap, flywheel ring gear damaged, CKP sensor
P1337	Engine control module (ECM), RPM signal – output	Wiring, RPM sensor, ECM
P1340	Camshaft position (CMP) sensor – signal	Wiring, CMP sensor, ECM
P1341	Camshaft position (CMP) actuator- mechanical fault	Camshaft timing mechanism, CMP actuator
P1342	Camshaft position (CMP) actuator- electrical fault	Wiring, connector, CMP actuator, ECM
P1400	Exhaust gas recirculation (EGR) valve/ solenoid – circuit malfunction	Wiring, connector, EGR valve/solenoid, ECM
P1411	Secondary air injection (AIR) system – malfunction	Wiring, connector, hoses, AIR pump, AIR solenoid
P1443	Evaporative emission (EVAP) canister purge valve – malfunction	Wiring, connector, EVAP canister purge valve
P1444	Evaporative emission (EVAP) system – malfunction	Wiring, connector, hose(s), EVAP canister purge valve, ECM
P1700	Transmission shift control – malfunction	Wiring, transmission shift control valve, TCM trouble code{s) stored
P1701	Transmission shift control valve – electrical fault	Wiring, transmission shift control valve
P1711	Intake manifold air control solenoid – malfunction	Wiring, connectors, intake manifold air control solenoid, ECM
P1740	Engine control module (ECM), load signal – plausibility	Wiring, electronic throttle system (ETS), MAF sensor, TP sensor, ECM
P1741	Throttle position (TP) sensor, load signal – plausibility	Wiring, electronic throttle system (ETS), MAF sensor, TP sensor, ECM
P1750	Diagnostic module, pin 30 – supply voltage low	Wiring, connector(s), fuse(s)