DTC P0139 (1.5L Engine): Notes

DTC P0139 (1.5L Engine)  : Secondary Heated Oxygen Sensor (Secondary HO2S (Sensor 2)) Slow Response

How to use this service information .

NOTICE: 

Before you troubleshoot, review the How to Troubleshoot - Refer to: How to Troubleshoot the Fuel and Emissions Systems (1.5L Engine) or How to Troubleshoot the Brake Booster Pressure Monitoring System or How to Troubleshoot the Fuel and Emissions Systems (2.0L Engine) (2024 2025) or How to Troubleshoot the CVT System .

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.