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.
2002 Mitsubishi Lancer LSFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
NOTE:
DTCs can only be retrieved by using a scan tool. See ENTERING ON-BOARD DIAGNOSTICS
under SELF-DIAGNOSTIC SYSTEM.
When Diagnostic Trouble Code (DTC) is obtained, refer to appropriate DTC test procedure under DIAGNOSTIC TESTS .
DIAGNOSTIC TROUBLE CODE INDEX
| DTC (1) | Description | ||||||
|---|---|---|---|---|---|---|---|
| P0101 | Volume Airflow Circuit Range/Performance Problem | ||||||
| P0102 | Volume Airflow Circuit Low Input | ||||||
| P0106 (2) | Barometric Pressure Circuit Range/Performance Problem | ||||||
| P0107 | Barometric Pressure Circuit Low Input | ||||||
| P0108 | Barometric Pressure Circuit High Input | ||||||
| P0111 | Intake Air Temperature Circuit Range/Performance Problem | ||||||
| P0112 | Intake Air Temperature Circuit Low Input | ||||||
| P0113 | Intake Air Temperature Circuit High Input | ||||||
| P0116 | Engine Coolant Temperature Circuit Range/Performance Problem | ||||||
| P0117 | Engine Coolant Temperature Circuit Low Input | ||||||
| P0118 | Engine Coolant Temperature Circuit High Input | ||||||
| P0121 | Throttle Position Sensor Circuit Range/Performance Problem | ||||||
| P0122 | Throttle Position Sensor Circuit Low Input | ||||||
| P0123 | Throttle Position Sensor Circuit High Input | ||||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||||
| P0128 | Coolant Thermostat Malfunction | ||||||
| P0132 | Heated Oxygen Sensor Circuit High Voltage (Sensor 1) | ||||||
| P0133 | Heated Oxygen Sensor Circuit Slow Response (Sensor 1) | ||||||
| P0134 (2) | Heated Oxygen Sensor Circuit No Activity Detected (Sensor 1) | ||||||
| P0135 | Heated Oxygen Sensor Heater Circuit (Sensor 1) | ||||||
| P0137 | Heated Oxygen Sensor Circuit Low Voltage (Sensor 2) | ||||||
| P0138 | Heated Oxygen Sensor Circuit High Voltage (Sensor 2) | ||||||
| P0139 | Heated Oxygen Sensor Circuit Slow Response (Sensor 2) | ||||||
| P0141 | Heated Oxygen Sensor Heater Circuit (Sensor 2) | ||||||
| P0171 | System Too Lean | ||||||
| P0172 | System Too Rich | ||||||
| P0181 | Fuel Temperature Sensor Circuit Range/Performance Problem | ||||||
| P0182 | Fuel Temperature Sensor Circuit Low Input | ||||||
| P0183 | Fuel Temperature Sensor Circuit High Input | ||||||
| P0201 | Cylinder No. 1 Fuel Injector Circuit | ||||||
| P0202 | Cylinder No. 2 Fuel Injector Circuit | ||||||
| P0203 | Cylinder No. 3 Fuel Injector Circuit | ||||||
| P0204 | Cylinder No. 4 Fuel Injector Circuit | ||||||
| P0300 | Random/Multiple Cylinder Misfire Detected | ||||||
| P0301 | Cylinder No. 1 Misfire Detected | ||||||
| P0302 | Cylinder No. 2 Misfire Detected | ||||||
| P0303 | Cylinder No. 3 Misfire Detected | ||||||
| P0304 | Cylinder No. 4 Misfire Detected | ||||||
| P0325 | Knock Sensor Circuit | ||||||
| P0335 | Crankshaft Position Sensor Circuit | ||||||
| P0340 | Camshaft Position Sensor Circuit | ||||||
| P0401 | EGR Flow Insufficient Detected | ||||||
| P0403 | EGR Control Circuit | ||||||
| P0421 | Warm Up Catalyst Efficiency Below Threshold | ||||||
| P0441 | Evaporative Emission Control System Incorrect Purge Flow | ||||||
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | ||||||
| P0443 | Evaporative Emission Control System Purge Control Valve Circuit | ||||||
| P0446 | Evaporative Emission Control System Vent Control Circuit | ||||||
| P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance | ||||||
| P0452 | Evaporative Emission Control System Pressure Sensor Low Input | ||||||
| P0453 | Evaporative Emission Control System Pressure Sensor High Input | ||||||
| P0455 | Evaporative Emission Control System Leak Detected (Gross Leak) | ||||||
| P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) | ||||||
| P0461 | Fuel Level Sensor Circuit Range/Performance Fuel Gauge Unit Circuit | ||||||
| P0500 | Vehicle Speed Sensor Circuit (M/T) | ||||||
| P0506 | Idle Control System RPM Lower Than Expected | ||||||
| P0507 | Idle Control System RPM Higher Than Expected | ||||||
| P0551 | Power Steering Pressure Sensor Circuit Range/Performance | ||||||
| P0705 (3) | Transmission Range Sensor Circuit Malfunction (PRNDL Input) | ||||||
| P0712 (3) | Transmission Fluid Temperature Sensor Low Input | ||||||
| P0713 (3) | Transmission Fluid Temperature Sensor High Input | ||||||
| P0715 (3) | Input/Turbine Speed Sensor Circuit | ||||||
| P0720 (3) | Output Speed Sensor Circuit | ||||||
| P0731 (3) | Gear 1 Incorrect Ratio | ||||||
| P0732 (3) | Gear 2 Incorrect Ratio | ||||||
| P0733 (3) | Gear 3 Incorrect Ratio | ||||||
| P0734 (3) | Gear 4 Incorrect Ratio | ||||||
| P0736 (3) | Gear "R" Incorrect Ratio | ||||||
| P0741 (3) | Torque Converter Clutch Circuit Performance Or Stuck Off | ||||||
| P0742 (3) | Torque Converter Clutch Circuit Stuck On | ||||||
| P0743 (3) | Torque Converter Clutch Electrical Circuit Malfunction | ||||||
| P0753 (3) | Shift Solenoid "A" Electrical Circuit Malfunction | ||||||
| P0758 (3) | Shift Solenoid "B" Electrical Circuit Malfunction | ||||||
| P0763 (3) | Shift Solenoid "C" Electrical Circuit Malfunction | ||||||
| P0768 (3) | Shift Solenoid "D" Electrical Circuit Malfunction | ||||||
| P1400 | Manifold Differential Pressure Sensor Circuit Malfunction | ||||||
| P1500 | Generator FR Terminal Circuit Malfunction | ||||||
| P1603 (2) | Battery Backup Circuit Malfunction | ||||||
| P1751 (3) | A/T Control Relay Malfunction | ||||||
|
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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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