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.
Verifying Repairs: Notes
Procedure for verifying repairs depends on scan tool functions and whether DTC is set by one-trip or two-trip fault detection logic. The two-trip fault detection logic requires fault to be detected on 2 consecutive drive cycles, with each meeting the code set criteria, before DTC will set and MIL will illuminate. DTCs using the one-trip fault detection logic will set the first time fault is detected. If fault is emissions related, PCM will also turn on MIL. Most DTCs use two-trip; fault detection logic. To determine which logic is used to set DTC, see DIAGNOSTIC TROUBLE CODE DEFINITIONS , then go to appropriate repair verification procedure.
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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.