Upstream O2 sensor '05 base auto

[djb383]

Anyone have luck with a auto parts store replacement upstream O2 (O'reilly, Autozone, NAPA, etc)? How do u tell which one is the correct upstream O2? Local GM stealer, ah, dealership wants $247 for the part. Local Toyota house can't look it up without a Toyota VIN. I've got a CEL and code P0031.

[bluneon]

B1S1; bank 1 sensor 1; technically an a/f sensor; located before the catalytic convertor.

B1S2; bank 1 sensor 2; technically the o2 sensor; located after the catalytic convertor.

ask the toyota dealership to pull up a diagram of the sensors. point to the one located before the catalytic convertor.

[djb383]

......and then the 'yota parts dude asks for the VIN, to narrow it down as to which O2 (multiple part #s based on VIN) and gives me that "deer in the headlights look" after I give them a non-'yota VIN.