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.
1995 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes - 2.2L
- Introduction
- Self-Diagnostic System
- ECM/Pcm Code Charts
- Notes
- Code 13: Open Oxygen Sensor Circuit
- Code 14: Coolant Temp Sens SGNL VLTGE Low (Hi Temp Indicated)
- Code 15: Coolant Temp Sensor Signal Voltage Low
- Code 19: Intermittent 7X Signal
- Code 21: Throttle Position Sensor Signal Voltage High
- Code 22: Throttle Position Sensor Signal Voltage Low
- Code 23: IAT Sensor Signal Voltage High (Low Temp Indicated)
- Code 24: Vehicle Speed Sensor
- Code 25: IAT Sensor Signal Voltage Low (High Temp Indicated)
- Code 26: Quad-Driver Module Error
- Code 27: Quad-Driver No. 1 Error
- Code 28: Quad-Driver No. 2 Error
- Code 32: EGR System Error
- Code 33: Map Sensor Signal Voltage High
- Code 34: Map Sensor Signal Voltage Low
- Code 35: IAC Idle Speed Error
- Code 43: Knock Sensor Error
- Code 44: Lean Exhaust Indication
- Code 45: Rich Exhaust Indication
- Code 51: Faulty Prom/Mem-Cal
- Code 53: System Voltage High
- Code 55: Pcm Error
- Code 55: Fuel Lean Monitor
- Code 66: A/C Pressure Sensor
- Summary
- 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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