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Location of the downstream oxygen sensor

Tiny
WOLFDOG1207
  • MEMBER
  • 1995 CHEVROLET LUMINA
  • 180,000 MILES
We have a 1995 Chevy Lumina car with a 3.1 engine, and we are unable to find the down stream oxygen sensor. We have looked under the car along the entire exhaust, and are still unable to find where it is located.
Thursday, June 27th, 2013 AT 6:45 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Check near the catalytic converter.
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Thursday, June 27th, 2013 AT 6:47 PM
Tiny
WOLFDOG1207
  • MEMBER
  • 3 POSTS
We have already under my car looking for this o2 sensor and looked right by the cat converter and still cant find it.
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Friday, June 28th, 2013 AT 5:29 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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It should be located on the exhaust. If you look in between the motor and the firewall you will see the upstream o2 sensor. If you crawl under the car and look behind the cat you will see the downstream O2. That is where the SHOULD be located.

I hope this helps.
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Friday, June 28th, 2013 AT 8:03 PM
Tiny
WOLFDOG1207
  • MEMBER
  • 3 POSTS
I found the one by the firewall, and followed the exhaust to the catalytic converter, and then followed the exhaust back, but I can still only find the 1 o2 sensor. Is it possible that I just have 1 o2 sensor?
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+2
Saturday, June 29th, 2013 AT 7:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
It is possible.
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Saturday, June 29th, 2013 AT 8:32 PM

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