| Flash code | OBD·II code | Fault location | Probable cause |
| – | PO, P2,
uo | Refer to OBD-11 trouble code tables | – |
| 1 | – | Heated oxygen sensor (H02S) – front – circuit/voltage high/low | Wiring short/open circuit, H02S, fuel system, ECM |
| 3 | – | Manifold absolute pressure (MAP) sensor – circuit/voltage low/high | Wiring, MAP sensor, ECM |
| 4 | – | Crankshaft position (CKP) sensor – circuit malfunction/range/performance problem | Wiring, CKP sensor, ECM |
| 5 | – | Manifold absolute pressure (MAP) sensor – range/performance problem | Hose leak/blockage, MAP sensor |
| 5 | P1128 | Manifold absolute pressure (MAP) sensor – pressure lower than expected | MAP sensor |
| 5 | P1129 | Manifold absolute pressure (MAP) sensor – pressure higher than expected | MAP sensor |
| 6 | – | Engine coolant temperature (ECT) sensor- circuit/voltage low/high | Wiring short/open circuit, ECT sensor, ECM |
| 7 | – | Throttle position (TP) sensor – circuit/
voltage low/high | Wiring, TP sensor, ECM |
| 7 | P1121 | Throttle position (TP) sensor – position lower than expected | TP sensor |
| 7 | P1122 | Throttle position (TP) sensor – position higher than expected | TP sensor |
| 8 | – | Camshaft position (CMP) sensor 1 – no signal/intermittent signal | Wiring, CMP sensor, ECM |
| 9 | – | Output shaft speed (OSS) sensor – circuit malfunction | Wiring, OSS sensor, ECM |
| 10 | – | Intake air temperature (IAT) sensor- circuit/
voltage low/high | Wiring short/open circuit, IAT sensor, ECM |
| 12 | P1491 | Exhaust gas recirculation (EGR) system – valve lift insufficient | Wiring, EGR valve/position sensor, EGR solenoid, hose leak/blockage, ECM
|
| 12 | P1498 | Exhaust gas recirculation (EGR) valve position sensor – voltage high | Wiring, EGR valve/position sensor, ECM |
| 13 | P1106 | Barometric pressure (BARO) sensor- range/performance problem | ECM |
| 13 | P1107 | Barometric pressure (BARO) sensor- circuit/voltage low | Wiring, ECM |
| 13 | P1108 | Barometric pressure (BARO) sensor- circuit/voltage high | ECM |
| 14 | – | Idle control system – malfunction | lAC valve, fast idle thermo valve, throttle body |
| 14 | P1519 | Idle air control (lAC) valve – circuit malfunction | Wiring, lAC valve, ECM |
| 15 | – | Turbine shaft speed (TSS) sensor- circuit malfunction | Wiring, TSS sensor, ECM |
| 20 | P1297 | Electrical load sensor – circuit/voltage low | Wiring, electrical load sensor, ECM |
| 20 | P1298 | Electrical load sensor – circuit/voltage high | Wiring, electrical load sensor, ECM |
| 22 | P1259 | VTEC system malfunction | Wiring, VTEC solenoid/pressure switch, ECM |
| 23 | – | Knock sensor (KS) – circuit malfunction | Wiring, KS, ECM |
| 26 | – | 3rd clutch pressure switch – circuit malfunction | Wiring, poor connection, 3rd clutch pressure switch, ECM |
| 28 | – | Transmission fluid temperature (TFT)
sensor – circuit malfunction | Wiring, TFT sensor, ECM |
| 40 | – | Torque converter clutch (TCC) solenoid – circuit malfunction | Wiring, TCC solenoid, ECM |
| 41 | – | Heated oxygen sensor (H02S) -front- heater circuit malfunction | Wiring, ECM |
| 45 | – | Mixture too lean/rich | Fuel system, front H025, MAP sensor, mechanical fault |
| 58 | – | Camshaft position (CMP) sensor 2 – no signal/intermittent signal | Wiring, CMP sensor, ECM |
| 61 | – | Heated oxygen sensor (H02S)- front – slow response | H02S, exhaust system |
| 63 | – | Heated oxygen sensor (H02S) – rear- slow response/circuit/voltage low/high | Wiring, H02S, ECM |
| 65 | – | Heated oxygen sensor (H02S) – rear- circuit malfunction | Wiring, ECM |
| 67 | – | Catalytic converter – efficiency below limit | Catalytic converter, rear H02S |
| 70 | – | AT- lock-up clutch not engaging/no gear shift | Wiring, mainshaft speed sensor, countershaft speed sensor, lock-up control system, shift solenoid (55) AlB, ECM |
| 70 | P1656 | Electronic stability programme (ESP) control module – communication malfunction | Wiring, ESP control module, ECM |
| 70 | P1705 | AT- gear shift malfunction | Wiring, range position switch, ECM |
| 70 | P1706 | AT – gear shift malfunction | Wiring, range position switch, ECM |
| 70 | P1739 | AT – 3rd clutch pressure switch | Wiring, 3rd clutch pressure switch, ECM |
| 70 | P1740 | AT -4th clutch pressure switch | Wiring, range position switch, ECM |
| 70 | P1750 | AT – hydraulic system mechanical malfunction | Wiring, range position switch, ECM |
| 70 | P1751 | AT – hydraulic system mechanical malfunction | Wiring, range position switch, ECM |
| 71 | – | Cylinder No.1 – misfire | Wiring, injector, ignition system, mechanical fault |
| 72 | – | Cylinder No.2 – misfire | Wiring, injector, ignition system, mechanical fault |
| 73 | – | Cylinder No.3 – misfire | Wiring, injector, ignition system, mechanical fault |
| 74 | – | Cylinder No.4 – misfire | Wiring, injector, ignition system, mechanical fault |
| 75 | – | Cylinder No.5 – misfire | Wiring, injector, ignition system, mechanical fault |
| 76 | – | Cylinder No.6 – misfire | Wiring, injector, ignition system, mechanical fault |
| – | P1399 | Random misfire | Fuel/ignition system, MAP sensor, lAC valve |
| 80 | – | Exhaust gas recirculation (EGR) solenoid – insufficient flow | EGR solenoid, hose/pipe leak or blockage |
| 86 | – | Engine coolant temperature (ECT) sensor – range/performance problem | ECT sensor, cooling system |
| 87 | – | Thermostat – range/performance problem | Thermostat, cooling system |
| 90 | P1456 | Evaporative emission (EVAP) canister purge system (fuel tank system) – leak detected | Hose, fuel tank/pressure sensor, fuel filler cap, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve |
| 90 | P1457 | Evaporative emission (EVAP) canister purge system (canister system) – leak detected | Hose, fuel tank/pressure sensor, EVAP valve/bypass solenoid, EVAP two way valve, EVAP canister/vent valve |
| 91 | – | Fuel tank pressure sensor- circuit/voltage low/high | Wiring, pressure sensor, ECM |
| – | P1607 | Engine control module (ECM) – internal circuit failure | ECM |
| 121 | – | Fuel tank level sensor- range/performance problem | Wiring, fuel tank level sensor |
| 121 | – | Fuel tank level sensor- low input | Wiring short to ground, fuel tank level sensor, ECM |
| 121 | – | Fuel tank level sensor- high input | Wiring short to positive, fuel tank level sensor, ECM |
