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.
System Tests: Notes
The CHECK ENGINE light is also referred to as Malfunction Indicator Light (MIL). The MIL is displayed in instrument cluster as CHECK ENGINE. MIL can be displayed in 2 modes flashing (intermittent failure) and on steady (hard failure). The Reduced Power Lamp (RPL) is displayed in instrument cluster as REDUCED POWER. RPL illuminates when PCM detects a system fault resulting in reduced engine output. Both MIL and RPL indicators should illuminate when ignition is turned on, and turn off seconds after engine is started. If either indicator remains illuminated after vehicle is running, scan tool should be used to read any stored DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If both MIL and RPL remain illuminated after vehicle is running, a serious problem affecting vehicle performance is indicated.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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