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 Discovery SEFACTORY 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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