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.
1996 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Trouble Code Definition
TROUBLE CODE DEFINITION - CARS
| Code No. | Circuit Affected |
|---|---|
| P0106 | MAP Sensor System Performance |
| P0107 | MAP Sensor Circuit Low Voltage |
| P0108 | MAP Sensor Circuit High Voltage |
| P0112 | IAT Sensor Circuit Low Voltage |
| P0113 | IAT Sensor Circuit High Voltage |
| P0117 | ECT Sensor Circuit Low Voltage |
| P0118 | ECT Sensor Circuit High Voltage |
| P0121 | TP Sensor System Performance |
| P0122 | TP Sensor Circuit Low Voltage |
| P0123 | TP Sensor Circuit High Voltage |
| P0125 | ECT Excessive Time To Reach Closed Loop |
| P0131 | O2S Circuit Low Voltage Sensor 1 |
| P0132 | O2S Circuit High Voltage Sensor 1 |
| P0133 | O2S Slow Response Sensor 1 |
| P0134 | O2S Insufficient Activity Sensor 1 |
| P0137 | HO2S Circuit Low Voltage Sensor 2 |
| P0138 | HO2S Circuit High Voltage Sensor 2 |
| P0140 | HO2S Insufficient Activity Sensor 2 |
| P0141 | HO2S Heater Circuit Sensor 2 |
| P0171 | Fuel Trim System Lean |
| P0172 | Fuel Trim System Rich |
| P0300 | Engine 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 |
| P0341 | Camshaft Position Sensor Circuit |
| P0342 | Camshaft Position Sensor Circuit Low |
| P0401 | EGR System Insufficient Flow |
| P0420 | TWC System Low Efficiency |
| P0441 | EVAP System Incorrect Purge Flow |
| P0506 | IAC System Rpm Low |
| P0507 | IAC System RPM High |
| P0530 | A/C Refrigerant Pressure Sensor Circuit |
| P0562 | System Voltage Low |
| P0563 | System Voltage High |
| P0600 | Loss Of Communication Link |
| P0601 | PCM Memory |
| P0602 | PCM Not Programmed |
| P1133 | O2S Insufficient Switching Sensor 1 |
| P1171 | Fuel System Lean During Acceleration |
| P1406 | EGR Valve Pintle Position Circuit |
| P1441 | EVAP System Flow During Non-Purge |
| P1520 | Park Neutral Position Discrete |
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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