Had check engine light come on, bank one sensor one, replaced the sensor. The light came back on and still shows bank one sensor one and the mass air flow sensor plus fuel level sensor??? Anyone run across this before? If you watch the readings on the O2 sensors while the car is running, both the Bank 1 and Bank 2 sensor 1's randomly drop to zero readings. Is this normal on an Xterra? Would a bad MAF sensor be able to screw up the readings on the O2 sensors? trying to figure out what is truly wrong and causing the check engine light.

Thanks

2004 Nissan Xterra 3.3 Automatic 75k miles.

Fuel level sensor=Recall. Check with a dealer if you vehicle applies. sorry no help with the 02's and maf...however i do belive a improper maf reading can affect 02 senor readings.