Entry Post

P0139 – O2 Circuit Slow Response (Bank 1, Sensor 2)

Post Content

P0139 – O2 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 HO2S signal. When the rate of voltage change is less than a calibrated value, the powertrain control module (PCM) begins to modify the fuel trim attempting to increase the HO2S voltage switch rate. The 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.
Possible Causes:       
Contaminated or damaged HO2S
Deteriorating HO2S
Exhaust leaks
Aftermarket accessories
Performance modifications
Diagnostic Aids:          Access the HO2S test results from the Generic OBD-II menu to verify the DTC.
Related Topics  P0038 - HO2S Heater Control Circuit High (Bank 1, Sensor 2)

There are no comments.

Compose Comment