Question about Pontiac Grand Prix

1 Answer

Many o2 sensors

I've got a 2003 Pontiac grand prix and I'm ordering oxygen sensors but was wondering how many it had? I've seen a lot of upstream and downstream and I'm not sure what that means.

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1 Answer

Wouldn't you actually look over the car & what the job entails,
before you order parts?
I would remove the ones your replacing & get the brand off
them as well, so you try & get the original factory brand.
Usually you just replace the front or upstream sensors,
not the rear monitors, until they fail
You ask about sensors,not knowing what ever
Use Google to educate yourself long before you
throw parts at something for no reason
In the professional world,the best of the best
few as there may be,actually test every component
before anything ever gets replaced,failed or just preventative
maintenance

Posted on Jul 11, 2013

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Posted on Jan 02, 2017

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  • 169 Answers

SOURCE: Upstream O2 sensor location?

That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
Good luck.
Please rate this response , and let me know if ya need more help!

Posted on Aug 31, 2008

motor1258
  • 6674 Answers

SOURCE: 1997 Dodge Stratus V6 oxygen sensor location

Upstream, as in ahead of the converter, back toward engine. Start at converter and work your way back, should be on exhaust pipe or even on manifold.

Posted on Jan 11, 2009

  • 412 Answers

SOURCE: replace oxygen sensors

these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

Posted on May 16, 2009

  • 323 Answers

SOURCE: oxygen sensor confusion

1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.

Posted on Aug 10, 2009

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chevyguy904
  • 36 Answers

SOURCE: 2003 Grand Prix service engine light on even after new catalytic

I wouldn't have gotten a cat. If the o2s are all replaced, then it could be an EGR valve

Posted on Oct 06, 2009

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