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 Off (KOEO) Self-Test
The first code shown is the On Demand code, the second code is a Separator code and the third code is the Continuous code. The On Demand first digit is indicated by a pulse, then the needle drops to zero for 2 seconds, then the second digit of the code is displayed. After 6-9 seconds, the Separator code (single digit) will be displayed for 1/2 second. After 6-9 seconds, the first digit of the Continuous code will be displayed, the needle will drop to zero for 2 seconds, then the second digit of the Continuous code will display.
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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.