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.
Continuous Monitor Mode (Wiggle Test)
This test allows a technician to attempt to re-create an intermittent fault while monitoring the system. This mode, also called the "wiggle test", may be used in both Key On Engine Off (KOEO) and Key On Engine Running (KOER) Self-Test modes. The CIRCUIT TESTS in TESTS W/CODES article specify the use of this procedure to identify intermittent faults in specific circuits or components.
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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.