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: Notes
The readiness code appears as an 8 -digit display in measuring value block 086, display field 1. Each of the 8 digits is allocated to a specific exhaust related system.
During a test sequence (which must be carried out in its entirity), On Board Diagnostic (OBD) checks the function of each of these systems and then changes the character assigned to it in the 8-digit display from a "1" to a "0".
When the readiness code is generated after a successfully completed test sequence, it reads "0 0 0 0 0 0 0 0" (measuring value block 086, display field 1).
If a single test is completed entirely, but indicated as "not OK", a DTC will be stored in DTC memory. See CHECK DTC MEMORY (FUNCTION 02) AND ERASE DTC MEMORY (FUNCTION 05) .
Readiness code is returned to "0 1 1 0 1 1 0 1" if:
- DTC memory was erased,
- a new Engine Control Module (ECM) was installed
In this case, readiness code must be re -generated. See READINESS CODE, GENERATING .
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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.