LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jaguar >> 1998 >> XJ8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Identification

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Circuit Affected Probable Cause
P0101  Mass Airflow Sensor Circuit Range/Performance Plugged Air Filter, Plugged Exhaust, Air Intake Leak, MAF Sensor Failure, Throttle Control Malfunction, Barometric Pressure Sensor Malfunction (Integral With ECM), Crankshaft Position Sensor Failure, Open Or Short Circuit, ECM Failure
P0102  Mass Airflow Sensor Circuit Voltage Low Open Or Short Circuit, ECM Failure, MAF Sensor Failure
P0103  Mass Airflow Sensor Circuit Voltage High Open Or Short Circuit, MAF Sensor Failure, ECM Failure
P0111  Intake Air Temperature Sensor Range/Performance Plugged Air Filter, Air Intake Leak, Open Or Short Circuit, IAT Sensor Failure
P0112  IAT Sensor Circuit Voltage High IAT Sensor Circuit Open Or Short To Voltage, IAT Sensor Failure
P0113  IAT Sensor Circuit Voltage Low IAT Sensor Circuit Short To Ground, IAT Sensor Failure
P0116  Engine Coolant Temperature Sensor Range/Performance Low Coolant Level, Thermostat Stuck Open, ECT Sensor Circuit Open, ECT Sensor Failure
P0117  XJ ECT Sensor Voltage High ECT Sensor Circuit Open Or Shorted, ECT Sensor Open
P0117  XK8 ECT Sensor Voltage High ECT Sensor Circuit Open Or Shorted, ECT Sensor Open
P0118  XJ ECT Sensor Voltage Low ECT Sensor Circuit Open Or Shorted, ECT Sensor Shorted
P0118  XK8 ECT Sensor Voltage Low ECT Sensor Circuit Open Or Shorted, ECT Sensor Shorted
P0121  Throttle Position Sensor "A" Circuit Range TP Sensor Output Constant Or Out Of Limits, TP Sensor Circuit Open
P0122  TP Sensor "A" Low Input TP Sensor Circuit Open, TP Sensor Open, ECM Failure
P0123  TP Sensor "A" High Input TP Sensor Short To Voltage, TP Sensor Circuit Shorted, ECM Failure
P0125  Insufficient Coolant Temperature For Closed Loop Fuel Control Low Coolant Level, Thermostat Stuck Open, ECT Sensor Failure, ECT Sensor Circuit Open
P0131  Front HO2S Circuit Voltage Low ("A" Bank) HO2S Failure, Sensor Ground Fault, Harness Or Connector Fault
P0132  Front HO2S Circuit Voltage High ("A" Bank) HO2S Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, HO2S Failure
P0133  Front HO2S Slow Response ("A" Bank) HO2S Heater Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature, HO2S Failure
P0135  Front HO2S Heater Circuit Malfunction ("A" Bank) HO2S Failure, Harness Or Connector Fault, ECM Failure
P0137  Rear O2 Circuit Voltage Low ("A" Bank) Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault
P0138  Rear O2 Circuit Voltage High ("A" Bank) Sensor Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, ECM Failure
P0140  Rear O2 No Activity ("A" Bank) Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature
P0151  Front HO2S Circuit Voltage Low ("B" Bank) HO2S Failure, Sensor Ground Fault, Harness Or Connector Fault
P0152  Front HO2S Circuit Voltage High ("B" Bank) HO2S Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, HO2S Failure
P0153  Front HO2S Slow Response ("B" Bank) HO2S Heater Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature, HO2S Failure
P0155  Front HO2S Heater Circuit Malfunction ("B" Bank) HO2S Failure, Harness Or Connector Fault, ECM Failure
P0157  Rear O2 Circuit Voltage Low ("B" Bank) Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault
P0158  Rear O2 Circuit Voltage High ("B" Bank) Sensor Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, ECM Failure
P0160  Rear O2 No Activity ("B" Bank) Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature
P0171  System Too Lean ("A" Bank) Low Fuel Pressure, Fuel Delivery System Blockage, Faulty Fuel Injector, Air Intake Leak, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault
P0172  System Too Rich ("A" Bank) High Fuel Pressure, Faulty Fuel Injector, Air Intake Restricted, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault
P0174  System Too Lean ("B" Bank) Low Fuel Pressure, Fuel Delivery System Blockage, Faulty Fuel Injector, Air Intake Leak, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault
P0175  System Too Rich ("B" Bank) High Fuel Pressure, Faulty Fuel Injector, Air Intake Restricted, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault
P0201  No. 1 Injector Circuit (Cylinder No. 1A) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0202  No. 2 Injector Circuit (Cylinder No. 2A) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0203  No. 3 Injector Circuit (Cylinder No. 3A) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0204  No. 4 Injector Circuit (Cylinder No. 4A) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0205  No. 5 Injector Circuit (Cylinder No. 1B) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0206  No. 6 Injector Circuit (Cylinder No. 2B) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0207  No. 7 Injector Circuit (Cylinder No. 3B) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0208  No. 8 Injector Circuit (Cylinder No. 4B) Open Or Short In Fuel Injector Or Circuit, ECM Failure
P0222  Throttle Position Sensor "B" Low Input TP Sensor Or Circuit Open, ECM Failure
P0223  Throttle Position Sensor "B" High Input TP Sensor Or Circuit Shorted, ECM Failure
P0300  Random Misfire Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0301  Misfire Cylinder No. 1 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0302  Misfire Cylinder No. 2 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0303  Misfire Cylinder No. 3 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0304  Misfire Cylinder No. 4 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0305  Misfire Cylinder No. 5 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0306  Misfire Cylinder No. 6 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0307  Misfire Cylinder No. 7 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0308  Misfire Cylinder No. 8 Detected Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure
P0327  No. 1 Knock Sensor Low Input Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure
P0328  No. 1 Knock Sensor High Input Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure
P0332  No. 2 Knock Sensor Low Input Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure
P0333  No. 2 Knock Sensor High Input Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure
P0335  Crankshaft Position Sensor Circuit Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault
P0340  Camshaft Position Sensor Circuit Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault
P0351  Ign. Coil No. 1A Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0352  Ign. Coil No. 2A Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0353  Ign. Coil No. 3A Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0354  Ign. Coil No. 4A Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0355  Ign. Coil No. 1B Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0356  Ign. Coil No. 2B Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0357  Ign. Coil No. 3B Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0358  Ign. Coil No. 4B Primary/Secondary Circuit Malfunction Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure
P0400 (1) EGR Flow Malfunction EGR Flow Insufficient Or Excessive, EGR Valve Failure, Connector Failure, ECM Failure
P0405 (1) EGR Sensor Circuit Low Input Open Circuit In EGR Valve Or Circuit, ECM Failure
P0406 (1) EGR Sensor Circuit High Input Short Circuit In EGR Valve Or Circuit, ECM Failure
P0420  Catalyst Efficiency Below Threshold "A" Bank HO2S/O2 Failure, Catalyst Failure
P0430  Catalyst Efficiency Below Threshold "B" Bank HO2S/O2 Failure, Catalyst Failure
P0441 (2) EVAP Control System Incorrect Purge Flow Purge Valve Failure, Purge Line Blockage Or Leak
P0442 (3) EVAP Control System Leak Fuel Cap Missing Or Leaking, Canister Or Hose Leaking, CCV Failure, Purge Valve Or Vacuum Hose Failure
P0444  XJ EVAP Control System Purge Valve Open Circuit Harness Or Connector Failure, Purge Valve Failure
P0444  XK8 EVAP Control System Purge Valve Open Circuit Harness Or Connector Failure, Purge Valve Failure
P0445  XJ EVAP Control System Purge Valve Short Circuit Harness Or Connector Failure, Purge Valve Failure
P0445  XK8 EVAP Control System Purge Valve Short Circuit Harness Or Connector Failure, Purge Valve Failure
P0447  EVAP Control System Open CCV Circuit Harness Or Connector Failure, CCV Failure
P0448  EVAP Control System Shorted CCV Circuit Harness Or Connector Failure, CCV Failure
P0452  FTP Sensor Low Input FTP Sensor Disconnected, Harness Or Connector Fault, FTP Sensor Failure
P0453  FTP Sensor High Input Open Or Short To Voltage In Harness Or Connector, FTP Sensor Failure
P0460  Fuel Level Sensor Circuit Malfunction Harness Or Connector Fault, Fuel Level Sensor Failure, Instrument Cluster Fault
P0506  ISC System (Low RPM) Throttle Valve Stuck Closed, Electronic Throttle Body Failure, Air Intake Blockage, A/C Compressor Seized, ECM Failure
P0507  ISC System (High RPM) Throttle Valve Stuck Open, Electronic Throttle Body Failure, Air Intake Leak, Cruise Control Vacuum System Failure, ECM Failure
P0560  System Voltage Malfunction Charging System Fault, Harness Or Connector Fault
P0566 Cruise Control Cancel Switch On Fault (4)
P0567 Cruise Control Resume Switch On Fault (4)
P0568 Cruise Control Switch Ground Malfunction (4)
P0569 Cruise Control Decel/Set Switch On Fault (4)
P0570 Cruise Control Accel/Set Switch On Fault (4)
P0603  ECM Data Corrupted ECM Failure
P0702 Transmission Control System Electrical (5)
P0705 (1) Transmission Range Sensor Performance (5)
P0706 Transmission Range Sensor Performance (5)
P0710 Transmission Fluid Temperature Sensor Malfunction (5)
P0715 Transmission Input/Turbine Speed Sensor Circuit Malfunction (5)
P0721 Transmission Output Speed Sensor Malfunction (5)
P0730 (1) Incorrect Gear Ratio (5)
P0740 (1) Torque Converter Clutch Circuit Malfunction (5)
P0741 Torque Converter Clutch System Performance Or Stuck Off (5)
P0742 Torque Converter Clutch System Stuck On (5)
P0743 Torque Converter Clutch System Electrical (5)
P0748 (1) Pressure Control Solenoid Electrical (5)
P0753 Transmission Shift Solenoid "A" Electrical (5)
P0758 Transmission Shift Solenoid "B" Electrical (5)
P0763 Transmission Shift Solenoid "C" Electrical (5)
P0780 (1) Shift Malfunction (5)
P0790 Normal/Performance Mode Circuit Malfunction (5)
P1000 Transmission System Check Not Complete Since Last Memory Clear (5)
P1104  MAF Sensor Ground Circuit Malfunction Sensor Open, Harness Or Connector Fault, ECM Failure
P1112 (1) IAT Sensor No. 2 Circuit High Voltage IAT Sensor Circuit Open Or Short To Voltage, IAT Sensor Failure
P1113 (1) IAT Sensor No. 2 Circuit Low Voltage IAT Sensor Circuit Short To Ground, IAT Sensor Failure, Intercooler Failure
P1121 Pedal Position Sensor "A" Circuit Range/Performance (6)
P1122 Pedal Position Sensor "A" Circuit Low Input (6)
P1123 Sensor "A" Circuit High Input (6)
P1221 Pedal Position Sensor "B" Circuit Range/Performance (6)
P1222 Pedal Position Sensor "B" Circuit Low Input (6)
P1223 Pedal Position Sensor "B" Circuit High Input (6)
P1224  Electronic Throttle Control Position Error Electronic Throttle Failure, Throttle Motor Failure, Throttle Motor Power Relay Fault, ECM Ground Fault, ECM Failure
P1226  Mechanical Guard Circuit Range/Performance Actuator Seized, Broken Spring, Sensor Out Of Range, Harness Or Connector Fault, ECM Failure
P1227  Mechanical Guard Circuit Low Input Sensor Failure, Open Circuit, Connector Fault, ECM Failure
P1228  Mechanical Guard Circuit High Input Sensor Failure, Short Circuit, Connector Fault, ECM Failure
P1229  Electronic Throttle Control Circuit Malfunction ECM Failure
P1230  Fuel Pump Relay Malfunction Relay Failure, Harness Or Connector Fault, Ground Fault
P1235 VSV Circuit Range/Performance (4)
P1236 VSV VV Circuit (4)
P1237 VSV VA Circuit (4)
P1238 VSV VR Circuit (4)
P1240  Sensor Power Supply Malfunction Mechanical Guard Sensor Short, Pedal Demand Sensor Short, TP Sensor Short, Harness Or Connector Fault, ECM Failure
P1241  Sensor Power Supply Low Input ECM Sensor Supply Fault, Harness Or Connector Fault, ECM Failure
P1242  Sensor Power Supply High Input ECM Sensor Supply Fault, Harness Or Connector Fault, ECM Failure
P1243  Analog Ground Malfunction Mechanical Guard Sensor Failure, Pedal Demand Sensor Failure, Open Ground Circuit, ECM Failure
P1245  Crank Signal Low Input Sensor Or Harness Short, ECM Or BPM Failure
P1246  Crank Signal High Input Sensor Or Harness Open Circuit, ECM Or BPM Failure
P1250 Throttle Valve Spring Malfunction (6)
P1251 Throttle Position (6)
P1252 VSV Stuck On VA/VV (4)
P1253 VSV Stuck On VR (4)
P1260 Security Input Malfunction (6)
P1313  Catalyst Damage Misfire ("A" Bank) See DTC P0300
P1314  Catalyst Damage Misfire ("B" Bank) See DTC P0300
P1316  Misfire Rate Excess Emissions See DTC P0300
P1336  Crankshaft/Camshaft Position Sensor Performance Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault
P1367  Ignition System Failure (Group 1) Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, Ignition Module No. 1 Failure, ECM Failure
P1368  Ignition System Failure (Group 2) Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, Ignition Module No. 1 Failure, ECM Failure
P1392  VVT Solenoid Circuit Low Input ("A" Bank) VVT Solenoid Or Circuit Open
P1393  VVT Solenoid Circuit High Input ("A" Bank) VVT Solenoid Or Circuit Shorted
P1396  VVT Solenoid Malfunction ("B" Bank) Oil Pressure Low, VVT Solenoid Sticking, CKP Sensor Failure, Connector Fault, ECM Failure
P1397  VVT Solenoid Circuit Low Input ("B" Bank) VVT Solenoid Or Circuit Open
P1398  VVT Solenoid Circuit High Input ("B" Bank) VVT Solenoid Or Circuit Shorted
P1474 (1) Intercooler Coolant Pump Relay Malfunction Relay Failure, Relay To ECM Drive Circuit, Relay Coil Ground Circuit, ECM Power Supply Fault
P1475 Radiator Fans Slow, Low Input/High Input (6)
P1476 Radiator Fans Fast, Low Input/High Input (6)
P1516  Transmission Park/Neutral Driving Malfunction Gearshift Cable Misadjusted, Rotary Switch Failure, Harness Or Connector Fault
P1517 Transmission Park/Neutral Starting Malfunction (6)
P1571 Brake Switch Malfunction (6)
P1601 (1) Internal Control Module Computer Error (5)
P1606 EMS Control Relay Malfunction ECM Control Relay Failure, ECM Control Relay To ECM Circuit Fault, ECM Control Relay Coil Power Supply Open Circuit, ECM Ground Circuit Fault
P1608 Transmission Watchdog Malfunction (5)
P1609  ECM Internal CPU-To-CPU Communication Failure ECM Flash Programming Circuit Shorted, ECM Failure
P1611  Throttle Angle Malfunction TPS Circuit Fault, Pedal Position Sensor Fault, Throttle Assembly Failure, ECM Failure
P1612  Throttle Offset Malfunction TPS Circuit Fault, Pedal Position Sensor Fault, Throttle Assembly Failure, ECM Failure
P1637 CAN Link/ABS Circuit/Network Malfunction (7)
P1638 CAN Link ECM/INSTCM Circuit/Network Malfunction (7)
P1642 CAN Link Circuit Malfunction (7)
P1643 CAN Link ECM/TCM Circuit/Network Malfunction (7)
P1646 (1) Secondary Fuel Pump Relay Malfunction Relay Failure, Harness Or Connector Fault, Ground Failure
P1720 Loss Of Output Speed & Wheel Information (5)
P1722 Transmission Stall Speed (5)
P1726 Engine Overspeed Malfunction (5)
P1730 Gear Control Malfunction (2, 3, 5) (5)
P1731 Inconsistent Gear Ratio (5)
P1734 Gear Control Malfunction (4) (5)
P1744 Torque Converter Clutch Heat Control (5)
P1745 Transmission Pressure Regulator No. 1 Malfunction (5)
P1746 Transmission Pressure Regulator No. 2 Malfunction (5)
P1747 Transmission Pressure Regulator No. 3 Malfunction (5)
P1748 Transmission Pressure Regulator No. 4 Malfunction (5)
P1779 Transmission (Gearshift) Load Control Malfunction (5)
P1789 Ignition Supply Malfunction (5)
P1793 Ignition Supply Malfunction (5)
P1794 Battery Supply Malfunction (6)
P1795 Inconsistent CAN Level (7)
P1796 CAN Controller Circuit Malfunction (Bus Off) (7)
P1797 CAN TCM/ECM Malfunction (7)
P1798 CAN TCM/INST Circuit Malfunction (7)
P1799 CAN/TCM ABS Circuit Malfunction (7)
(1) XJR only.
(2) XK8 only.
(3) XJR & XJ8 only.
(4) See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.
(5) See DIAGNOSIS - 5HP24, 5R55N & W5A580 article in AUTOMATIC TRANSMISSIONS.
(6) Information is not available from manufacturer.
(7) See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT.
scientia non olet · About LEMON Manuals