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.
Key On-Engine Running (KOER) Self-Test
The codes shown are an Engine ID code, a Dynamic Response Code and an On Demand code. On Demand codes are the same as Continuous codes in Key On-Engine Off Self-Test. Dynamic Response code is the same as a Separator code in Key On-Engine Off Self-Test. The Engine ID code has no application in the field, and is for factory use only. The codes will be displayed in the same manner as Key On-Engine Off Self-Test codes.
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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.