First things first: What year and model car do you have?locosteelersfan said:I get this nearly all the time since last week, but twice I got P0101
(maf sensor) which I'm ignoring for now. So what just buy the O2 sensor or
is there another fix?
We're going to need to know the year and model you've got to get the part numbers... Generally, though, the two front sensors are one part number and the ones just before and after the cat are a different part number. I think the gmpartsdirect web site sucks donkeys. Use www.rockauto.com if you can and I think you'll find the parts much easier and very good prices as well.locosteelersfan said:I didn't see the MAF on GMPD, anyone know the P#
AFS-109 is the AC-Delco part number for the B1S1 and B2S1 sensors. $72 at www.rockauto.com. GMPD only lists one and it doesn't say which one it is, so I can't tell what the right part number is. Their catalog system sucks major donkeys.locosteelersfan said:Anyone know the P# of the B2S1 sensor
NO this thing is driving me nuts. Its good for a few weeks then it doens't stop for a few, like now. 75%+ of the time I get an O2 code, the other is the 0101 MAF. Now 80% of the O2 are 0151, 15% are 0131(both low voltage, different banks) and rarely a 0171.ewill3rd said:I wouldn't replace a MAF for a P0101 unless it was persistent.
A low voltage bank two accompanied by a MAF code might lead me to look for some sort of entry point for unmetered air, although it's not really likely. I can't tell you without more info.
Are these the only codes you see?
Remember Bank 2 on a N* is the front bank!
This O2 sensor is up front near the EBTCM.
My snap judgement would be that you have a contaminated sensor.
Fix the O2 then clear the codes and monitor for any to return.