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 and system check, MIL will illuminate when ignition switch is turned to ON position and engine is not running. When engine is started, light should go out. If light does not go out, a malfunction has been detected in the computerized engine control system or MIL circuit is faulty. Light may be used on some models to display stored diagnostic trouble codes. To access codes using "scan" or "non-scan" methods, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.