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.
SERVICE ENGINE SOON Light
SERVICE ENGINE SOON light is controlled by PCM. The light will be on if a problem is present when ignition is on, or light will flicker on and off to indicate a problem has occurred. SERVICE ENGINE SOON light is also used to flash engine related trouble codes when cavity "A" and "B" of PCM diagnostic connector are jumpered. See Figure .
Use the Manual With the Right Hardware
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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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