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 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
MIL Operation
MIL is located on Instrument Panel Cluster (IPC) and is displayed as CHECK ENGINE light.
MIL Function
- MIL informs the driver that a malfunction has occurred and vehicle should be taken in for service as soon as possible.
- MIL illuminates during a bulb test and a system test.
- A DTC will be stored if a MIL is requested by the diagnostic.
MIL Illumination
- MIL will illuminate with ignition ON and engine not running.
- MIL will turn off when engine is started.
- MIL will remain ON if the self-diagnostic system has detected a malfunction.
- The MIL may turn off if the malfunction is not present.
- If MIL is illuminated and then the engine stalls, MIL will remain illuminated so long as ignition switch is ON.
- If MIL is not illuminated and the engine stalls, MIL will not illuminate until ignition switch is cycled OFF, then ON.
Factory Service Tools
Use the Manual With the Right Hardware
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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.