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.
1998 Jaguar XJRFACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Description & Operation
- Self-Diagnostic System
- Summary
- Connector Identification
- Diagnostic Trouble Code Identification
- Diagnostic Tests
- DTC P0101: Mass Airflow Sensor Performance
- DTC P0102, P0103 & P1104: Mass Airflow Sensor Circuit
- DTC P0111 & P0112: Intake Air Temperature Sensor
- DTC P0113: Intake Air Temperature Sensor
- DTC P0116: Engine Coolant Temperature Sensor Performance & DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0117: Engine Coolant Temperature Sensor Circuit Low Input (XJ Series)
- DTC P0117: Engine Coolant Temperature Sensor Circuit Low Input (XK8)
- DTC P0118: Engine Coolant Temperature Sensor Circuit High Input (XJ Series)
- DTC P0118: Engine Coolant Temperature Sensor Circuit High Input (XK8)
- DTC P0121: Throttle Position Sensor "A" Performance
- DTC P0122: Throttle Position Sensor "A" Voltage Low Or DTC P0222: Throttle Position Sensor "B" Voltage Low
- DTC P0123: Throttle Position Sensor "A" Voltage High Or DTC P0223: Throttle Position Sensor "B" Voltage High
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0131, P0132 & P0135: Ho2S Circuit Low/High Voltage Or Heater Circuit Malfunction (Bank No. 1, Sensor No. 1)
- DTC P0133: Ho2S Sensor Circuit Slow Response (Bank No. 1, Sensor No. 1)
- DTC P0135: Ho2S Heater Circuit Malfunction (Bank No. 1, Sensor No. 1)
- DTC P0137 & P0138: Oxygen Sensor Low/High Voltage (Bank No. 1, Sensor No. 2)
- DTC P0140: Oxygen Sensor No Signal Or Poor Signal Detected (Bank No. 1, Sensor No. 2)
- DTC P0151, P0152 & P0155: Ho2S Sensor Circuit Low/High Voltage Or Heater Circuit Malfunction (Bank No. 2, Sensor No. 1)
- DTC P0153: Ho2S Sensor Circuit Slow Response (Bank No. 2, Sensor No. 1)
- DTC P0155: Ho2S Sensor Heater Circuit Malfunction (Bank No. 2, Sensor No. 1)
- DTC P0157 & P0158: Oxygen Sensor Circuit Low/High Voltage (Bank No. 2, Sensor No. 2)
- DTC P0160: Oxygen Sensor No Signal Or Poor Signal Detected (Bank No. 2, Sensor No. 2)
- DTC P0171, P0172, P0174 Or P0175: System Too Lean/Rich
- DTC P0201-P0208: Injector Circuit
- DTC P0222: Throttle Position Sensor "B" Voltage Low
- DTC P0223: Throttle Position Sensor "B" Voltage High
- DTC P0300-P0308, P1313, P1314 & P1316: Misfire
- DTC P0327, P0328, P0332 & P0333: Knock Sensor
- DTC P0335: Crankshaft Position Sensor Circuit
- DTC P0340: Camshaft Position Sensor Circuit Or P1336: Crankshaft Or Camshaft Position Sensor Performance
- DTC P0351-P0358: Ignition Coil Circuit Malfunction
- DTC P0400: EGR Flow Malfunction (XJR)
- DTC P0405: EGR Sensor Circuit Low (XJR)
- DTC P0406: EGR Sensor Circuit High (XJR)
- DTC P0420 & P0430: Catalyst Efficiency Below Threshold
- DTC P0441: EVAP Control System (XK8)
- DTC P0442: EVAP Control System Leak Detected (XJ Series)
- DTC P0444 & P0445: EVAP Control System Purge Valve (XJ Series)
- DTC P0444 & P0445: EVAP Control System Purge Valve (XK8)
- DTC P0447 & P0448: EVAP Control System Canister Close Valve Circuit (XJ Series)
- DTC P0452 & P0453: Fuel Tank Pressure Sensor
- DTC P0460: Fuel Level Sensor
- DTC P0506 & P0507: Idle Speed Control System
- DTC P0560: System Voltage Malfunction
- DTC P0603: Internal ECM Error
- DTC P1104: Mass Airflow Sensor
- DTC P1112: Intake Air Temperature Sensor No. 2 High Voltage (XJR)
- DTC P1113: Intake Air Temperature Sensor No. 2 Low Voltage (XJR)
- DTC P1224: Electronic Throttle Control Position Error
- DTC P1226: Mechanical Guard Circuit Range
- DTC P1227 & P1228: Mechanical Guard Circuit Low Or High Input
- DTC P1229: Throttle Control Circuit Malfunction
- DTC P1230: Fuel Pump Relay Malfunction
- DTC P1240: Sensor Power Supply Malfunction
- DTC P1241-P1242: Sensor Power Supply Low Or High Input
- DTC P1243: Analog Ground Malfunction
- DTC P1245-P1246: Crank Signal Low Or High Input
- DTC P1313, P1314 & P1316: Misfire, Catalyst Damage/Excess Emissions
- DTC P1336: Camshaft Position Sensor (CMP) Circuit
- DTC P1367: Ignition System Failure Group 1
- DTC P1368: Ignition System Failure Group 2
- DTC P1392 & P1397: Variable Valve Timing Solenoid Low Input
- DTC P1393 & P1398: Variable Valve Timing Solenoid High Input
- DTC P1396 Variable Valve Timing (VVT) Solenoid "B" Malfunction
- DTC P1397: Variable Valve Timing Solenoid "B" Low Input
- DTC P1398: Variable Valve Timing Solenoid "B" High Input
- DTC P1474: INTERCOOLER Coolant Pump Relay Malfunction
- DTC P1516: Park/Neutral Malfunction
- DTC P1609: Internal ECM Error
- DTC P1611: Throttle Target Malfunction
- DTC P1612: Throttle Offset Malfunction
- DTC P1646: Secondary Fuel Pump Relay Malfunction (XJR)
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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