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.
Additional System Functions: Mil
MIL is CHECK ENGINE light on instrument panel. MIL is intended to alert driver of certain malfunctions in EEC system. Light may also be used to retrieve trouble codes stored in PCM. When hooked up for KOEO SELF-TEST, light will display all codes which turn on light during vehicle operation.
If light comes on during vehicle operation, vehicle should be inspected as soon as possible. Immediately turning off engine is not necessary. Vehicle can be driven with light on. On California models, MIL will come on and stay on if a system monitored by PCM malfunctions. On Federal models, MIL will stay on only if PCM or Camshaft Position (CMP) sensor malfunctions.
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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.