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.
Readiness code: Function
The readiness code is an 8 -digit number code which displays the emission diagnostic status.
When On Board Diagnostic for a system (e.g. exhaust gas recirculation system) has been successfully completed, the appropriate digit of the number code will be changed from 1 to 0.
Diagnosis is performed at regular intervals during normal driving. It is recommended that the readiness code be set after performing repairs on an emission system, to guarantee that these systems function correctly. If a Diagnostic Trouble Code (DTC) is detected during the diagnosis it will be entered in DTC memory.
Each time DTC memory is erased or voltage supply is interrupted the readiness code will be erased.
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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.