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/Throttle Soon Light
As a bulb and system check, SERVICE ENGINE/THROTTLE SOON light glows 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 operate as described, malfunction has been detected in computerized engine control system or SERVICE THROTTLE SOON light circuit is faulty.
To verify proper operation of SERVICE ENGINE SOON light on gasoline models, see DIAGNOSTIC CIRCUIT CHECK in BASIC TESTING article.
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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