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1997 Pontiac Sunfire O2 Sensor

Tiny
WHYTETYGERGUY
  • MEMBER
  • 1997 PONTIAC SUNFIRE
Engine Performance problem
1997 Pontiac Sunfire 4 cyl Front Wheel Drive Automatic 160K miles

I need to replace the OS sensor on my wife's car and am not sure which one to buy. On costs $20 and one costs $70. They tell me it's a matter of whether it's before or after the catalytic converter. I can't seem to figure out which it is. What exactly am I looking for?
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Wednesday, March 26th, 2008 AT 4:06 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
That depends on what one you want to cost, the one before the converter is the one that adjusts the fuel mixture and when bad cuases engine running problems. It is known as bank 1 sensor one or bank 2 sensor one.

Sensor 2 is after the cat and is just to tell if the convertor is functioning properly.
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Wednesday, March 26th, 2008 AT 7:17 PM

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