CRIS_Y2K_SE

this is what auto zone gave me " The PCM has determined that during testing, the fuel system for back one was too rich, (Bank 1 indentifies the location on cylinder #1, while Bank 2 identifies the cylinders on opposite bank) the guy at autozone told me that it is an oxygen sensor. what do i need to fix this , please help, thanx in advance.

DanL

There are two front sensors (one for each bank) and the ECU uses them to help maintain the correct air/fuel mixture, so yes, it would make sense that the one on bank 1 may be going bad. If you look at the front of your engine you'll see a line of multicolored connectors (3 or 4 depending on whether your car is Fed or Cali emissions spec). I believe the one with the black connector is the bank 1 sensor.
You can replace it yourself but they're usuall very hard to get out, even with an O2 sensor removal tool ($10 at you local parts store). Like all exhaust-related components they have a tendancy to weld themself in place and I seem to remember that one being really hard to get to as well.

CRIS_Y2K_SE

ok can you tell me about how much a sensor cost and are you refering that it costs $10 for the tool to remove the sensor. thanx again.

DanL

I seem to remember hearing that the sensor is around $120-$130 from the dealer and yes, the O2 socket tool runs between $10 and $15.