DTC Troubleshooting: P0139 (3.0L Engine): Notes
DTC P0139 : Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Slow Response
NOTICE:
Before you troubleshoot, review the How to Troubleshoot - Refer to: How to Troubleshoot the Fuel and Emissions Systems(2.0L Engine) or How to Troubleshoot the Fuel and Emissions Systems(3.0L Engine) .
NOTE:
If there are leaks from the exhaust system, this DTC will be set. Check for damage in the exhaust pipe and repair it if needed.