DTC P0689 Chevrolet
O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
Description
The heated oxygen sensor (HO2S) monitor tracks the rate of voltage change during the rise and fall of the heated oxygen sensor bank 1, sensor 2 (HO2S12) signal. When the rate of voltage change is less than a calibrated value, the PCM begins to modify the fuel trim attempting to increase the HO2S voltage switch rate. This DTC sets when the PCM is at the allowable limit or has exceeded an allowable length of time for fuel trim modification, without detecting an acceptable rate of voltage change.
Cause and Solution
Exhaust leaksAftermarket accessoriesPerformance modificationsContaminated HO2S12Deteriorating HO2S12Damaged HO2S12
Diagnosis:
Access the HO2S test results from the Generic OBD II menu to verify the DTC.
Video Guide
Diagnostic Info
- DTC Code: P0689
- Brand: Chevrolet