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.
2003 Saturn LW200FACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics
- Introduction
- Self-Diagnostic System
- Programming
- Drive Cycles
- Notes
- Inspection/Maintenance System Check
- Inspection/Maintenance Complete System Set Procedure
- Inspection/Maintenance System DTCS
- Inspection/Maintenance Catalyst System Set Procedure
- Inspection/Maintenance Evaporative Emission System Set Procedure
- Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure
- Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure
- Summary
- Diagnostic Trouble Code Definitions
- Component Locations
- Connector Identification
- System Tests
- Diagnostic Tests
- Notes
- DTC P0105: Map Sensor Circuit Range/Performance
- DTC P0107: Map Sensor Circuit - Low Voltage
- DTC P0108: Map Sensor Circuit - High Voltage
- DTC P0112: IAT Sensor Circuit - Low Voltage
- DTC P0113: IAT Sensor Circuit - High Voltage
- DTC P0117: ECT Sensor Circuit - Low Voltage
- DTC P0118: ECT Sensor Circuit - High Voltage
- DTC P0122: TP Sensor Circuit - Low Voltage
- DTC P0123: TP Sensor Circuit - High Voltage
- DTC P0125: ECT Excessive Time To Enter Closed Loop
- DTC P0128: Coolant Thermostat (Coolant Temp. Below Thermostat Regulating Temperature)
- DTC P0130: Ho2S Circuit - Bank 1; Sensor 1
- DTC P0131: Ho2S Circuit - Low Voltage (Bank 1; Sensor 1)
- DTC P0132: Ho2S Circuit - High Voltage (Bank 1; Sensor 1)
- DTC P0133: Ho2S Slow Response - Bank 1; Sensor 1
- DTC P0134: Ho2S Circuit - Insufficient Activity (Bank 1; Sensor 1)
- DTC P0135 Or P0141: Ho2S Heater Circuit - Bank 1; Sensor 1 Or 2
- DTC P0137: Ho2S Circuit - Low Voltage (Bank 1; Sensor 2)
- DTC P0138: Ho2S Circuit - High Voltage (Bank 1; Sensor 2)
- DTC P0140: Ho2S Circuit - Insufficient Activity (Bank 1; Sensor 2)
- DTC P0171: Fuel Trim System Lean - Bank 1
- DTC P0172: Fuel Trim System Rich - Bank 1
- DTC P0201-P0204: Injector Control Circuit
- DTC P0300: Engine Misfire Detected
- DTC P0301-P0304: Cylinders No. 1-4 Misfire Detected
- DTC P0326: Knock Sensor Performance
- DTC P0327: Knock Sensor Circuit
- DTC P0336: Crankshaft Position Sensor Circuit
- DTC P0340: Camshaft Position Sensor Circuit
- DTC P0341: Camshaft Position Sensor "A" - Circuit Performance (Bank 1)
- DTC P0410: Secondary Air Injection System
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- DTC P0440: Evaporative Emission System
- DTC P0442: EVAP System - Small Leak Detected
- DTC P0446: EVAP Vent Solenoid Valve Control System
- DTC P0452: EVAP Fuel Tank Pressure Sensor Circuit - Low Voltage
- DTC P0453: EVAP 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: Pcm Memory
- DTC P1133: Ho2S Insufficient Switching - Bank 1; Sensor 1
- DTC P1134: Ho2S Transition Time Ratio - Bank 1; Sensor 1
- DTC P1137: Ho2S Lean Or Low Voltage - Bank 1; Sensor 2
- DTC P1138: Ho2S Rich Or High Voltage - Bank 1; Sensor 2
- DTC P1171: Fuel System Lean During Acceleration
- DTC P1336: Crankshaft Position System Variation Not Learned
- DTC P1441: EVAP System Flow During Non-Purge
- DTC P1599: Engine Stall Or Near Stall Detected
- DTC P1640: Control Module Output Circuit
- Wiring Diagrams
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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