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.
Scan Tester Procedure
Connect tachometer and scan tester to vehicle. Access EGR temperature sensor service data item No. 43. Tester should display sensor temperature. With engine at normal operating temperature and idling at 750 RPM for at least 2 minutes, check sensor temperature. Scan tester should display 158°F (70°C) or less. Accelerate engine to 3500 RPM. Scan tester should display 158°F (70°C) or more.
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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.