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
All vehicles are equipped with a Malfunction Indicator Light (MIL). MIL may also be referred to as CHECK ENGINE light and is displayed as an engine icon on instrument cluster. MIL will momentarily illuminate when ignition is first turned on to do a bulb check. MIL may illuminate when systems related to emission controls are malfunctioning during normal vehicle operation. For additional information on MIL operation, see SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS 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.