| OBD-11 code | Fault location | Probable cause |
| PO, P2,UO | Refer to OBD-11 trouble code tables | – |
| P1031 | Heated oxygen sensor (H02S) 1 – malfunction | Wiring, connector, H02S |
| P1146 | Mass air flow (MAF) sensor(s)- malfunction | Wiring, intake leak, MAF sensor(s) |
| P1147 | Engine coolant temperature (ECT) sensor(s)- malfunction | Wiring, ECT sensor(s) |
| P1148 | Intake air temperature (IAT) sensor(s)- malfunction | Wiring, IAT sensor(s) |
| P1149 | Manifold absolute pressure (MAP) sensor(s)- malfunction | Wiring, hose(s), MAP sensor(s), ECM |
| P1162 | Throttle position (TP) sensor(s)- malfunction | Wiring, TP sensor(s) |
| P1163 | Engine oil level switch – malfunction | Wiring, engine oil level switch, ECM |
| P1177 | Engine oil sensor, quality/level/temperature – malfunction | Wiring, engine oil sensor |
| P1178 | Engine oil sensor, level – implausible signal | Wiring, oil level, engine oil sensor |
| P1179 | Engine oil sensor, quality – implausible signal | Wiring, engine oil sensor |
| P1180 | Engine oil sensor, temperature too high | Wiring, engine oil sensor |
| P1181 | Engine coolant blower motoriNG condenser blower motor – malfunction | Wiring, engine coolant blower motor/AIC
condenser blower motor, ECM |
| P1182 | C-Ciass 06/97 – : Starter motor relay – defective | Wiring, starter motor relay, ignition switch, ECM |
| P1185 | Engine oil sensor, quality – water in oil | Engine oil |
| P1186 | Fuel shut-off- recognised | Wiring, cruise control actuator, mechanical fault, ECM |
| P1225 | Intake manifold air control solenoid – malfunction | Wiring, intake manifold air control solenoid, ECM |
| P1233 | Throttle actuator – mechanical fault | Throttle actuator tight/sticking |
| P1300 | Crankshaft position (CKP) sensor(s) – m;: lfunction | Wiring, flywheel ring gear damaged, CKP
sensor(s) |
| P1384 | Knock sensor (KS) 1, bank 2 – malfunction | Wiring, KS |
| P1385 | Knock sensor (KS) 2, bank 2 – malfunction | Wiring, KS |
| P1386 | Engine control module (ECM), knock control – defective | Fuel contamination, mechanical fault, ECM |
| P1386 | Engine control module (ECM), bank 1, knock control – defective | Fuel contamination, mechanical fault, ECM |
| P1397 | Camshaft position (CMP) sensor(s)- malfunction | Wiring, CMP sensor(s) |
| P1400 | Exhaust gas recirculation (EGR) solenoid- circuit malfunction | Wiring, EGR solenoid, hose(s), ECM |
| P1420 | Secondary air injection (AIR} valve/solenoid – defective | Wiring, fuse, AIR valve/solenoid, ECM |
| P1443 | Evaporative emission (EVAP) canister purge valve(s)- defective | Wiring, hoses, EVAP canister purge valve(s) |
| P1453 | Secondary air injection (AIR) pump relay – defective | Wiring, fuse, AIR pump relay, ECM |
| P1463 | Secondary air injection (AIR) system – defective | Wiring, hoses, AIR pump relay, AIR valve/
solenoid |
| P1490 | Evaporative emission (EVAP) canister purge valve(s)- defective | Wiring, hoses, EVAP canister purge valve(s) |
| P1491 | NC system – pressure too high | A/C control module trouble code(s) stored |
| P1519 | Camshaft position (CMP) control, bank 1 – mechanical fault | Camshaft position control system |
| P1522 | Camshaft position (CMP) control, bank 2 – mechanical fault | Camshaft position control system |
| P1525 | Camshaft position (CMP) actuator, bank 1 – defective | Wiring, CMP actuator, ECM |
| P1533 | Camshaft position (CMP) actuator, bank 2 – defective | Wiring, CMP actuator, ECM |
| P1542 | Accelerator pedal position (APP) sensor – signal | Wiring, APP sensor, ECM |
| P1570 | Ignition switch control module/ECM – attempted theft/data bus/not compatible | Wiring, trouble code(s) stored in other system(s), ignition switch control module, ECM |
| P1580 | Throttle motor, bank 1, TPM/ISC – circuit malfunction | Wiring, throttle motor, ECM |
| P1581 | Throttle motor, bank 2, TPM/ISC – circuit malfunction | Wiring, throttle motor, ECM |
| P1584 | Brake pedal position (BPP) switch – malfunction | Wiring, BPP switch, trouble code(s) stored in other system(s) |
| P1587 | Engine control module (ECM), bank 1 & 2 – supply voltage | Wiring, connectors, ECM |
| P1588 | CAN data bus, central locking control module – malfunction | Wiring |
| P1589 | Engine control module (ECM), bank 2, knock control – defective | Fuel contamination, mechanical fault, ECM |
| P1603 | CAN data bus, ignition switch control module – malfunction | Wiring |
| P1605 | Acceleration sensor, ESP/ASR system – rough road signal, comparison of wheel speeds | Trouble code(s) stored in other system(s) |
| P1632 | Engine control module (ECM), bank 2 – internal fault | ECM |
| P1641 | Engine control module (ECM), bank 1 & 2 – TP
signal | Wiring, ECM |
| P1642 | Engine control module (ECM) – incorrectly coded | ECM coded for MT with AT fitted |
| P1643 | Engine control module (ECM) – incorrectly coded/data bus | ECM coded for AT with MT fitted, wiring |
| P1644 | Transmission control module (TCM) – supply voltage low | Wiring, TCM trouble code(s) stored |
| P1681 | Engine control module (ECM), crash signal – plausibility | Wiring, connectors, SRS control module trouble code(s) stored, ECM |
| P1747 | CAN data bus, TCM/instrument panel – malfunction | Wiring, trouble code(s) stored in other system(s) |
