DTC Description
The PCM monitors the trim of lambda control by the rear HO2S signal in addition to the HO2S monitoring. The trim value calculation is based on the difference of rear HO2S signal from desired value. The PCM sets DTC P2097 if either trim value or the difference of rear HO2S from desired value is reached to the minimum threshold. If the same error code is set in the next driving cycle, the PCM illuminates the MIL.