Volvo Repair: 1999 volvo S80, volvo s80, 1999 volvo s80

Question
Roger, Can you tell me where bank 1, bank two, and sensor one, sensor two is in relation to the exhaust pipes and cat? I have a check engine light on and it's telling me bank 1 sensor 1 is the culpret. Also what is the best brand of O2 sensor to buy in your opinion? Also what is the heater and what does it do on an O2 sensor? My code says O2 sensor heater fail. Thanks for your help. Mark.

Answer
Mark, bank1 should be front cat left side.  I would have to actually look it up since its been a while since I had to do those.  Best brand would be OE sensors which is either Denso or Bosvh.  You would have to pull the sensor out and look at what brand it is.  Never Heard of 02 Sensor Heater fail.  What kind of crazy scanner are you using?  Roger