Could P0303 be caused by a faulty O2 sensor?

Question

I have a 2004 Nissan Maxima and I know the O2 sensor is an issue. Could that be causing the P0303 code? I am not noticing an actual misfire but my flex pipe is shot too so it's hard to tell. I recently got a quote for a repair and it was astronomical so I want to make sure that you're not trying to rip me off.

Answer 1

Hi there

A bad O2 sensor will not cause a single cylinder misfire. This could be the result of several things, the coil, the fuel injector or possibly and intake manifold gasket leak, but not the O2 sensor.