| Code: | Item: |
Fault: |
| 12 | Initiation of diagnosis. | n/a |
| 13 | Oxygen sensor | No change in voltage/open circuit. |
| 14 | Coolant Temperature Sensor (CTS) | Low voltage |
| 15 | Coolant Temperature Sensor (CTS) | High voltage |
| 16 | Knock sensor 1 | No change in voltage |
| 17 | Knock sensor 2 | No change in voltage |
| 18 | Knock control unit | No signal, Engine Control Unit (ECU) fault |
| 19 | RPM signal (crankshaft sensor) | Incorrect signal |
| 21 | Throttle position sensor | High voltage |
| 22 | Throttle position sensor | Low voltage |
| 23 | Knock sensor module | n/a |
| 24 | Vehicle speed sensor (VSS) | No signal |
| 25 | Injector valve 1 | High voltage |
| 26 | Injector valve 2 | High voltage |
| 27 | Injector valve 3 | High voltage |
| 28 | Injector valve 4 | High voltage |
| 28 | Fuel pump relay | Low voltage |
| 29 | Injector valve 5 | High voltage |
| 31 | Engine RPM signal (crankshaft sensor) | No signal |
| 32 | Injector valve 6 | High voltage |
| 32 | Fuel pump relay | High voltage |
| 33 | Inlet manifold pressure sensor | Voltage too high |
| 34 | Exhaust Gas Re-circulation (EGR) valve | Voltage too high |
| 34 | Manifold Absolute Pressure (MAP) sensor | Low voltage |
| 35 | Idle Speed Control Valve (ISCV) | Poor or no idle speed control |
| 36 | Incorrect RON/Octane setting | Damaged RON plug or bad connection. |
| 37 | Engine self-diagnosis (fault code light) | Low voltage |
| 38 | Oxygen sensor | Voltage low (1990 model year on) |
| 39 | Oxygen sensor | Voltage high (1990 model year on) |
| 41 | Vehicle speed sensor (VSS) | Low voltage |
| 41 | 1 gear ident switch (C20LET systems) | Low voltage |
| 41 | EST Line coil cylinder 2&3 (M2.8/XEV systems) | High voltage |
| 42 | Vehicle speed sensor (VSS) | High voltage |
| 42 | 1 gear ident switch (C20LET systems) | High voltage |
| 42 | EST Line coil cylinder 2&3 (M2.8 / XEV systems) | High voltage |
| 43 | Linear EGR system (XEV systems) | Faulty |
| 44 | Oxygen sensor | Air/fuel mixture too lean (weak) |
| 45 | Oxygen sensor | Air/fuel mixture too rich |
| 46 | Air pump relay | High voltage |
| 47 | Air pump relay | Low voltage |
| 47 | Linear EGR Position (XEV systems) | Faulty |
| 48 | Battery voltage | Low voltage |
| 49 | Battery voltage | High voltage |
| 51 | ECU Programmable memory | PROM error, hardware failure |
| 52 | Engine check light; final stage (fault code light) | High voltage |
| 53 | Fuel pump relay | Low voltage |
| 54 | Fuel pump relay | High voltage |
| 55 | Engine Control Unit (ECU) fault | Renew Engine Control Unit (ECU) |
| 56 | Idle Speed Control Valve (ISCV) | Short to earth |
| 57 | Idle Speed Control Valve (ISCV) | Interruption |
| 59 | Inlet manifold valve 1 | Low voltage |
| 61 | Fuel Tank Vent Valve (FTVV) | Low voltage |
| 62 | Fuel Tank Vent Valve (FTVV) | High voltage |
| 63 | Inlet manifold valve 1 | High voltage |
| 63 | EST Line coil cylinder 2&3 (M2.8 / XEV systems) | Low voltage |
| 64 | EST Line coil cylinder 1&4 (M2.8 / XEV systems) | Low voltage |
| 65 | Carbon Monoxide (CO) potentiometer | Low voltage |
| 66 | Carbon Monoxide (CO) potentiometer | High voltage |
| 67 | Throttle valve switch - idle position switch | Low voltage - switch not opening |
| 68 | Throttle Switch (TS) - idle contact | Idle switch not opening |
| 69 | Air Temperature Sensor (ATS) | Low voltage |
| 71 | Air Temperature Sensor (ATS) | High voltage |
| 72 | Throttle Switch (TS) - full load contact | High voltage - Full load switch not running |
| 73 | Air Flow Sensor (AFS) | Low voltage |
| 74 | Air Flow Sensor (AFS) | High voltage |
| 75 | Transmission switch - torque control | Low voltage |
| 76 | Automatic Transmission (AT) torque control | Engaged long, ignition retard long |
| 79 | Traction control unit | Incorrect ignition/injector cut-off |
| 81 | Injector valve 1 | Low voltage |
| 82 | Injector valve 2 | Low voltage |
| 83 | Injector valve 3 | Low voltage |
| 84 | Injector valve 4 | Low voltage |
| 85 | Injector valve 5 | Low voltage |
| 86 | Injector valve 6 | Low voltage |
| 87 | Air Conditioning (AC) cut off relay | Low voltage |
| 88 | Air Conditioning (AC) cut off relay | High voltage |
| 89 | Oxygen sensor heater | Low voltage |
| 91 | Oxygen sensor heater | High voltage |
| 92 | Camshaft sensor failure (XEV systems) | Faulty |
| 93 | Hall Effect Switch (HES) | Low voltage |
| 94 | Hall Effect Switch (HES) | High voltage |
| 95 | Hot start valve | Low voltage |
| 96 | Hot start valve | High voltage |
| 97 | Traction control unit - ignition/injection cut off | Incorrect signal - high voltage |
| 98 | Oxygen sensor | Open circuit, wiring break |
| 99 | Code unknown | n/a |
| 113 | Turbo boost control | Boost presure high, out of range |
| 114 | Idle boost valve | Above upper limit |
| 115 | Full boost pressure | Below lower limit |
| 116 | Boost pressure | Above upper limit |
| 117 | Wastegate valve | Low voltage |
| 118 | Wastegate valve | High voltage |
| 121 | Oxygen sensor 2 | Lean exhaust, weak mixture |
| 122 | Oxygen sensor 2 | Rich mixture/exhaust |
| 123 | Inlet manifold valve 1 | Blocked |
| 124 | Inlet manifold valve 2 | Blocked |
| 132 | Exhaust Gas Re-circulation (EGR) valve | Incorrect signal |
| 133 | Exhaust Gas Re-circulation (EGR) valve 2 | High voltage |
| 134 | Exhaust Gas Re-circulation (EGR) valve 2 | Low voltage |
| 135 | 'Check engine' lamp (fault code lamp) | Low voltage |
| 136 | Engine Control Unit (ECU) | n/a |
| 137 | Engine Control Unit (ECU) box | High temperature |
| 141 | Secondary air pump | Not enough air |
| 142 | Secondary air pump | Air without pump |
| 143 | Immobiliser function in ECU | No or incorrect signal |
| 144 | No immobiliser signal recived | Faulty unit or break in wiring |
| 145 | Incorrect immobiliser signal received | Faulty unit or break in wiring |