Possible Causes
WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
ECM illuminates MIL and sets DTC P0139 when Bank 1 HO2S 2 response time is too long.
ECM illuminates MIL and sets DTC P0159 when Bank 2 HO2S 2 response time is too long. Possible causes are:
- HO2S 2 circuit open or shorted.
- Poor, loose, corroded or damaged terminal connections.
- Defective HO2S 2.
- Incorrect fuel pressure.
- Faulty injectors.
- Intake air leaks.