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.
OBD II Serviceability Issues: Notes
Based on the knowledge gained from On-Board Diagnostic (OBD II) experience in the 1994 and 1995 model years, this list of non-vehicle faults that could affect the performance of the OBD II system has been compiled. These non-vehicle faults vary from environmental conditions to the quality of fuel used. With the introduction of OBD II diagnostics across the entire passenger car and light-duty truck market in 1996, illumination of the MIL due to a non-vehicle fault could lead to misdiagnosis of the vehicle, increased warranty expense and customer dissatisfaction. The following list of non-vehicle faults does not include every possible fault and may not apply equally to all product lines.
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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.