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.
Hard Failures
To prevent a false Diagnostic Trouble Code (DTC) from being stored in PCM memory, some malfunctions must be detected during 2 consecutive drive cycles. This applies to heated oxygen sensors (HO2S), fuel metering-related components, idle control system, Engine Coolant Temperature (ECT) sensor, Exhaust Gas Recirculation (EGR) system, Three-Way Catalytic (TWC) converter system, evaporative (EVAP) control system and other self-diagnostic functions. First occurrence of a detected malfunction is stored in PCM memory. If same malfunction is detected again after ignition switch is turned off and then back on, a hard failure DTC is stored and Malfunction Indicator Light (MIL) is turned on. MIL will remain on until detected malfunction is repaired. Malfunction can be determined by retrieving DTCs. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION and RETRIEVING DIAGNOSTIC TROUBLE CODES .
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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