Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when switching frequency of HO2S2 increases to a specified value, indicating that 3-way catalyst is not operating properly. Possible causes are:
- Defective 3-way catalyst (exhaust manifold).
- Exhaust leak.
- Intake air leaks.
- Defective injectors.
- Defective spark plugs.
- Incorrect ignition timing.