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
The "readiness code" indicates that the required fault checks were performed by the OBD system. It is not important whether a fault was found. The readiness code is cancelled if the fault memory is erased or the power supply (terminal 30) is cut off with a code stored. The readiness code is not reset when the battery is disconnected if no fault is stored. To initiate the readiness code, at least two trips have to be completed.
For the following systems the "readiness code" is shown:
- Three Way Catalytic Converter (TWC) converting
- Fuel tank ventilation system
- Secondary air injection system
- Oxygen sensor
- Oxygen sensor heating
Use the Manual With the Right Hardware
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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.