Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1997 Land Rover Defender 90 AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Identification
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Definition | (1) Test Drive | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| P0101 | Mass Airflow (MAF) Sensor Circuit Out Of Range | "B" | ||||||||
| P0102 | Mass Airflow (MAF) Sensor Circuit Low Input | "A" | ||||||||
| P0103 | Mass Airflow (MAF) Sensor Circuit High Input | "A" | ||||||||
| P0111 | Intake Air Temp. (IAT) Sensor Reading Not Changing As Expected | "C" | ||||||||
| P0112 | Intake Air Temp. (IAT) Sensor Circuit Low Range Fault | "A" | ||||||||
| P0113 | Intake Air Temp. (IAT) Sensor Circuit High Range Fault | "A" | ||||||||
| P0116 | Coolant Temp. (ECT) Sensor Falling Temp. Fault | "A" | ||||||||
| P0117 | Coolant Temp. (ECT) Sensor Circuit Low Range Fault | "A" | ||||||||
| P0118 | Coolant Temp. (ECT) Sensor Circuit High Range Fault | "A" | ||||||||
| P0121 | TP Sensor Signal Inconsistent With MAF, IAC, IAT Sensors & Engine Speed Signals | "B" | ||||||||
| P0122 | Throttle Position (TP) Sensor Circuit Low Input | "A" | ||||||||
| P0123 | Throttle Position (TP) Sensor Circuit High Input | "A" | ||||||||
| P0125 | Coolant Temp. (ECT) Sensor Excessive Time To Closed Loop/No Warm-Up Fault | "B" | ||||||||
| P0130 | HO2S Circuit Slow Response, Front Bank "A" (2) | "C" | ||||||||
| P0131 | HO2S Circuit Low Voltage, Front Bank "A" (2) | "C" | ||||||||
| P0132 | HO2S Circuit High Voltage, Front Bank "A" (2) | "C" | ||||||||
| P0133 | HO2S Circuit Slow Response, Front Bank "A" (2) | "C" | ||||||||
| P0136 | HO2S Circuit Slow Response, Front Bank "B" (2) | "C" | ||||||||
| P0137 | HO2S Circuit Low Voltage, Rear Bank "A" (2) | "C" | ||||||||
| P0138 | HO2S Circuit High Voltage, Rear Bank "A" (2) | "C" | ||||||||
| P0139 | HO2S Circuit Slow Response, Rear Bank "A" (2) | "C" | ||||||||
| P0150 | HO2S Circuit Slow Response, Rear Bank "A" (2) | "C" | ||||||||
| P0151 | HO2S Circuit Low Voltage, Front Bank "B" (2) | "C" | ||||||||
| P0152 | HO2S Circuit High Voltage, Front Bank "B" (2) | "C" | ||||||||
| P0153 | HO2S Circuit Slow Response, Front Bank "B" (2) | "C" | ||||||||
| P0156 | HO2S Circuit Slow Response, Rear Bank "B" (2) | "C" | ||||||||
| P0157 | HO2S Circuit Low Voltage, Rear Bank "B" (2) | "C" | ||||||||
| P0158 | HO2S Circuit High Voltage, Rear Bank "B" (2) | "C" | ||||||||
| P0159 | HO2S Circuit Slow Response, Rear Bank "B" (2) | "C" | ||||||||
| P0171 | System Too Lean Bank "A" (2) | "C" | ||||||||
| P0172 | System Too Rich Bank "A" (2) | "C" | ||||||||
| P0174 | System Too Lean Bank "B" (2) | "C" | ||||||||
| P0175 | System Too Rich Bank "B" (2) | "C" | ||||||||
| P0181 | Fuel Temp. Sensor Fault, Invalid Reading When Compared With Coolant Temp. | "A" | ||||||||
| P0182 | Fuel Temp. Sensor Circuit Low Range Fault | "A" | ||||||||
| P0183 | Fuel Temp. Sensor Circuit High Range Fault | "A" | ||||||||
| P0201 | Fuel Injector Circuit Fault, Cylinder No. 1 | "A" | ||||||||
| P0202 | Fuel Injector Circuit Fault, Cylinder No. 2 | "A" | ||||||||
| P0203 | Fuel Injector Circuit Fault, Cylinder No. 3 | "A" | ||||||||
| P0204 | Fuel Injector Circuit Fault, Cylinder No. 4 | "A" | ||||||||
| P0205 | Fuel Injector Circuit Fault, Cylinder No. 5 | "A" | ||||||||
| P0206 | Fuel Injector Circuit Fault, Cylinder No. 6 | "A" | ||||||||
| P0207 | Fuel Injector Circuit Fault, Cylinder No. 7 | "A" | ||||||||
| P0208 | Fuel Injector Circuit Fault, Cylinder No. 8 | "A" | ||||||||
| P0300 | Misfire On Multiple Cylinders | "C" | ||||||||
| P0301 | Misfire On Cylinder No. 1 | "C" | ||||||||
| P0302 | Misfire On Cylinder No. 2 | "C" | ||||||||
| P0303 | Misfire On Cylinder No. 3 | "C" | ||||||||
| P0304 | Misfire On Cylinder No. 4 | "C" | ||||||||
| P0305 | Misfire On Cylinder No. 5 | "C" | ||||||||
| P0306 | Misfire On Cylinder No. 6 | "C" | ||||||||
| P0307 | Misfire On Cylinder No. 7 | "C" | ||||||||
| P0308 | Misfire On Cylinder No. 8 | "C" | ||||||||
| P0326 | Continuous Knock on Bank "A" (2) | "B" | ||||||||
| P0327 | Knock Sensor Background Noise Low, Bank "A" (2) | "B" | ||||||||
| P0328 | Knock Sensor Background Noise High, Bank "A" (2) | "B" | ||||||||
| P0331 | Continuous Knock Sensor on Bank "B" (2) | "B" | ||||||||
| P0332 | Knock Sensor Background Noise Low, Bank "B" (2) | "B" | ||||||||
| P0333 | Knock Sensor Background Noise High, Bank "B" (2) | "B" | ||||||||
| P0335 | Crankshaft Position (CKP) Sensor Circuit, No Signal | "A" | ||||||||
| P0336 | Crankshaft Position (CKP) Sensor Generating Poor Quality Signal | "A" | ||||||||
| P0340 | Camshaft Position Sensor Circuit Fault Or Signal Timing Different From Crankshaft Position Signal | "A" | ||||||||
| P0420 | Catalyst Efficiency Low, Bank "A" (2) | "C" | ||||||||
| P0430 | Catalyst Efficiency Low, Bank "B" (2) | "C" | ||||||||
| P0441 | EVAP Purge Control Valve Flow Fault | "C" | ||||||||
| P0442 | EVAP Loss Control System, Small Leak (3) | "D" | ||||||||
| P0443 | EVAP Purge Control Valve Circuit Open Or Short | "A" | ||||||||
| P0446 | EVAP Canister Close Valve Malfunction (3) | "A" | ||||||||
| P0451 | Fuel Tank Pressure Sensor Poor Performance (3) | "A" | ||||||||
| P0452 | Fuel Tank Pressure Sensor Low Range Fault (3) | "A" | ||||||||
| P0453 | Fuel Tank Pressure Sensor High Range Fault | "A" | ||||||||
| P0460 | Fuel Level Sensor Circuit Fault | "A" | ||||||||
| P0461 | Fuel Level Sensor Not Changing As Expected | "C" | ||||||||
| P0500 | Vehicle Speed Sensor (VSS) Signal Out Of Range | "B" | ||||||||
| P0506 | Idle Air Control (IAC) Low Idle Speed | "A" | ||||||||
| P0507 | Idle Air Control (IAC) High Idle Speed | "A" | ||||||||
| P0560 | ECM Reads Low Battery Voltage At Engine Speeds Where Generator Should Be Operating | "A" | ||||||||
| P0562 | Battery Volts Read By ECM Too Low To Be Possible | "A" | ||||||||
| P0563 | Battery Volts Read By ECM Too High To Be Possible | "A" | ||||||||
| P0605 | ECM Self-Check Fault (Adaptation & Fault Record Memory Corrupted) | "A" | ||||||||
| P1137 | HO2S Problem Switching To Rich, Sensor(s) Bank "A" (2) | "C" | ||||||||
| P1138 | HO2S Problem Switching To Lean, Sensor(s) Bank "A" (2) | "C" | ||||||||
| P1139 | HO2S Switching Period Too Long, Sensor(s) Bank "A" (2) | "C" | ||||||||
| P1157 | HO2S Problem Switching Rich, Sensor(s) Bank "B" (2) | "C" | ||||||||
| P1158 | HO2S Problem Switching Lean, Sensor(s) Bank "B" (2) | "C" | ||||||||
| P1159 | HO2S Switching Period Too Long, Sensor(s) Bank "B" (2) | "C" | ||||||||
| P1171 | System Too Lean Bank "A" & Bank "B" (2) | "C" | ||||||||
| P1172 | System Too Rich Bank "A" & Bank "B" (2) | "C" | ||||||||
| P1176 | Long Term Fuel Trim Too Lean, Banks 1 & 2, Fuel Mass Flow Rate (FMFR) | "C" | ||||||||
| P1177 | Long Term Fuel Trim Too Rich, Banks 1 & 2, Fuel Mass Flow Rate (FMFR) | "C" | ||||||||
| P1178 | Long Term Fuel Trim Too Lean, Banks 1 & 2, Air Mass Flow Rate (AMFR) | "C" | ||||||||
| P1179 | Long Term Fuel Trim Too Rich, Banks 1 & 2, Air Mass Flow Rate (AMFR) | "C" | ||||||||
| P1185 | HO2S Heater Circuit Open, Front Sensors | "C" | ||||||||
| P1186 | HO2S Heater Circuit Short, Front Sensors | "C" | ||||||||
| P1187 | HO2S Heater Circuit Inferred Open Circuit, Front Sensors | "C" | ||||||||
| P1188 | HO2S Heater Circuit High Resistance, Front Sensors | "C" | ||||||||
| P1189 | HO2S Heater Circuit Inferred Low Resistance, Front Sensors | "C" | ||||||||
| P1190 | Oxygen Sensor (HO2S) Heater Circuit Low Resistance, Front Sensors | "C" | ||||||||
| P1191 | HO2S Heater Circuit Open, Rear Sensors | "C" | ||||||||
| P1192 | HO2S Heater Circuit Short, Rear Sensors | "C" | ||||||||
| P1193 | HO2S Heater Circuit Inferred Open Circuit, Rear Sensors | "C" | ||||||||
| P1194 | HO2S Heater Circuit High Resistance, Rear Sensors | "C" | ||||||||
| P1195 | HO2S Heater Circuit Inferred Low Resistance, Rear Sensors | "C" | ||||||||
| P1196 | HO2S Heater Circuit Low Resistance, Rear Sensors | "C" | ||||||||
| P1201 | Fuel Injector Circuit Open Or Short, Cylinder No. 1 | "A" | ||||||||
| P1202 | Fuel Injector Circuit Open Or Short, Cylinder No. 2 | "A" | ||||||||
| P1203 | Fuel Injector Circuit Open Or Short, Cylinder No. 3 | "A" | ||||||||
| P1204 | Fuel Injector Circuit Open Or Short, Cylinder No. 4 | "A" | ||||||||
| P1205 | Fuel Injector Circuit Open Or Short, Cylinder No. 5 | "A" | ||||||||
| P1206 | Fuel Injector Circuit Open Or Short, Cylinder No. 6 | "A" | ||||||||
| P1207 | Fuel Injector Circuit Open Or Short, Cylinder No. 7 | "A" | ||||||||
| P1208 | Fuel Injector Circuit Open Or Short, Cylinder No. 8 | "A" | ||||||||
| P1313 | Misfire Likely To Damage Catalyst, Bank "A" (2) | "C" | ||||||||
| P1314 | Misfire Likely To Damage Catalyst, Bank "B" (2) | "C" | ||||||||
| P1315 | Persistent Misfires | "C" | ||||||||
| P1316 | Misfire Causing Excessive Emissions | "A" | ||||||||
| P1317 | ABS Rough Road Signal Line Stuck At Ground Or Open Circuit | "A" | ||||||||
| P1318 | ABS Rough Road Signal Line Stuck At Battery Volts | "A" | ||||||||
| P1361 | No Ign. Coil Activation, Coil 1, Cyl. Nos. 1 & 6 | "A" | ||||||||
| P1362 | No Ign. Coil Activation, Coil 2, Cyl. Nos. 5 & 8 | "A" | ||||||||
| P1363 | No Ign. Coil Activation, Coil 3, Cyl. Nos. 4 & 7 | "A" | ||||||||
| P1364 | No Ign. Coil Activation, Coil 4, Cyl. Nos. 2 & 3 | "A" | ||||||||
| P1371 | Early Ign. Coil Activation, Coil 1, Cyls. 1 & 6 | "A" | ||||||||
| P1372 | Early Ign. Coil Activation, Coil 2, Cyls. 5 & 8 | "A" | ||||||||
| P1373 | Early Ign. Coil Activation, Coil 3, Cyls. 4 & 7 | "A" | ||||||||
| P1374 | Early Ign. Coil Activation, Coil 4, Cyls. 2 & 3 | "A" | ||||||||
| P1440 | EVAP Canister Purge Control Valve Stuck Open (3) | "C" | ||||||||
| P1447 | EVAP Canister Close Valve Poor Performance (3) | "D" | ||||||||
| P1448 | EVAP Loss Control System, Major Leak (3) | "D" | ||||||||
| P1496 | EVAP Loss Control System, Major Leak (3) | "D" | ||||||||
| P1508 | Idle Air Control (IAC) Valve Stepper Motor Circuit Open | (4) | ||||||||
| P1509 | Idle Air Control (IAC) Valve Stepper Motor Circuit Short | (4) | ||||||||
| P1514 | Neutral Drive Switch Fault, Indicates Neutral During High Load | "B" | ||||||||
| P1516 | Neutral Drive Switch Fault, Indicates Neutral During Gear Change | "B" | ||||||||
| P1517 | Neutral Drive Switch Fault, Indicates Drive During Cranking | "B" | ||||||||
| P1607 | MIL Circuit Open Or Shorted | "A" | ||||||||
| P1621 | Communication With Security ECM Has Not Happened Within Expected Time | "A" | ||||||||
| P1622 | 3 Non-Identical Or 2 Identical Wrong Security Codes Received By ECM in Sequence | "A" | ||||||||
|
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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