Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. 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 warm-up 3-way catalyst is not operating properly. Possible causes are:
- Defective warm-up 3-way catalyst (exhaust manifold).
- Exhaust leak.
- Intake air leaks.
- Defective injectors.
- Defective spark plugs.
- Incorrect ignition timing.