Readiness code: Function

The readiness code is an 8-digit number block that indicates the results of an emission relevant On Board Diagnostic (OBD).

When the diagnostic for a system (e.g.: Secondary Air Injection (AIR) system) has run through successfully, the respective digit of the number block is set from 1 to 0.

Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions-related system, the readiness code should be generated via a road test to ensure that these systems are working according to specifications. If a malfunction is recognized during the diagnostic, it is stored in DTC memory.

The readiness code is erased every time the DTC memory is erased and every time the voltage supply is interrupted. For this reason, only erase the DTC memory if there is a DTC stored in it.