Note. For circuit reference, see WIRING DIAGRAMS . For component locations, see COMPONENT LOCATIONS . For connector identification, see CONNECTOR IDENTIFICATION .
Home/Pontiac/Sunfire/Pontiac Sunfire I (1995-2005)/Repair manual/Testing & Diagnostics/DTC P0420: TWC SYSTEM - LOW EFFICIENCY
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls Self-Diagnostics - 2.2L: Overview
- Engine Controls Self-Diagnostics - 2.2L: Diagnosis
- Engine Controls Self-Diagnostics - 2.2L: Component Locations
- Engine Controls Self-Diagnostics - 2.2L: Other
- DTC P0105: MANIFOLD ABSOLUTE PRESSURE SENSOR PERFORMANCE/RANGE
- DTC P0107: MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0108: MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0112: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0113: INTAKE AIR TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0117: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0122: THROTTLE POSITION SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0125: ENGINE COOLANT TEMPERATURE INSUFFICIENT FOR CLOSED LOOP FUEL CONTROL
- DTC P0128: ENGINE COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE
- DTC P0130: HO2S CIRCUIT CLOSED LOOP PERFORMANCE - SENSOR 1
- DTC P0131: HO2S CIRCUIT LOW VOLTAGE - SENSOR 1
- DTC P0132: HO2S CIRCUIT HIGH VOLTAGE - SENSOR 1
- DTC P0133: HO2S SLOW RESPONSE - SENSOR 1
- DTC P0134: HO2S CIRCUIT INSUFFICIENT ACTIVITY - SENSOR 1
- DTC P0135: HO2S HEATER PERFORMANCE - SENSOR 1
- DTC P0137: HO2S CIRCUIT LOW VOLTAGE - SENSOR 2
- DTC P0138: HO2S CIRCUIT HIGH VOLTAGE - SENSOR 2
- DTC P0138: HO2S2 CIRCUIT - VOLTAGE HIGH
- DTC P0140: HO2S CIRCUIT INSUFFICIENT ACTIVITY - SENSOR 2
- DTC P0141: HO2S HEATER PERFORMANCE - SENSOR 2
- DTC P0171: FUEL TRIM SYSTEM LEAN
- DTC P0172: FUEL TRIM SYSTEM RICH
- DTC P0201-P0204: INJECTOR CONTROL CIRCUIT
- DTC P0300: ENGINE MISFIRE DETECTED
- DTC P0301-P0304: CYLINDER MISFIRE DETECTED
- DTC P0326: KNOCK SENSOR PERFORMANCE
- DTC P0327: KNOCK SENSOR CIRCUIT
- DTC P0336: CRANKSHAFT POSITION SENSOR PERFORMANCE
- DTC P0340: CAMSHAFT POSITION SENSOR CIRCUIT - LOW INPUT
- DTC P0341: CAMSHAFT POSITION SENSOR PERFORMANCE
- DTC P0420: TWC SYSTEM - LOW EFFICIENCY
- DTC P0440: EVAPORATIVE EMISSION SYSTEM
- DTC P0442: EVAPORATIVE EMISSION CONTROL SYSTEM - SMALL LEAK DETECTED
- DTC P0446: EVAPORATIVE EMISSION VENT SYSTEM PERFORMANCE
- DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE
- DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE
- DTC P0506: IDLE SPEED LOW
- DTC P0507: IDLE SPEED HIGH
- DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 OR P2610: ECU MALFUNCTION
- DTC P1133: HO2S INSUFFICIENT SWITCHING - SENSOR 1
- DTC P1134: HO2S TRANSITION TIME RATIO - SENSOR 1
- DTC P1137: HO2S LOW VOLTAGE DURING POWER ENRICHMENT - SENSOR 2
- DTC P1138: HO2S CIRCUIT HIGH VOLTAGE DURING DECEL FUEL CUTOFF - SENSOR 2
- DTC P1171: FUEL SYSTEM LEAN DURING ACCELERATION
- DTC P1336: CRANKSHAFT POSITION SYSTEM VARIATION NOT LEARNED
- DTC P1441: EVAPORATIVE EMISSION SYSTEM FLOW DURING NON-PURGE
- Engine Controls - System & Component Tests - 2.2L: Overview
- Engine Controls - System & Component Tests - 2.2L: Diagnosis
- Engine Controls - System & Component Tests - 2.2L: Wiring
- Engine Controls - System & Component Tests - 2.2L: Component Locations
- Engine Controls - System & Component Tests - 2.2L: Other
- Engine Controls - Trouble Shooting - No Codes - 2.2L: Overview
- Engine Controls - Trouble Shooting - No Codes - 2.2L: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - 2.2L: NVH
- Engine Controls - Trouble Shooting - No Codes - 2.2L: Other
- Engine Controls - Basic Diagnostic Procedures - 2.2L: Overview
- Engine Controls - Basic Diagnostic Procedures - 2.2L: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - 2.2L: Other
- Abbreviations
- Accessories Control Systems
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