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.
Malfunction Indicator Light (Mil)
As a bulb check, MIL illuminates for 2 seconds when ignition is on and engine is not running. MIL also illuminates when a system failure has been detected and a corresponding DTC has been set in PCM memory. Not all trouble codes will activate MIL. If MIL comes on and no DTCs are stored in memory, problem may be caused by an intermittent electrical problem and not necessarily a faulty component. See INTERMITTENTS in TESTS W/O CODES article.
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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.