Need to know the location of all three O2 sensors?

Tiny
KIMWILL1973
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
Need to know the locations of all three O2 sensors in my car listed above and need a diagram showing locations on engine. Please and thank you.
Monday, July 21st, 2025 AT 5:19 PM

6 Replies

Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Bank 1 sensor 1. The rear exhaust manifold before the cat
And bank2 the front exhaust manifold sensor 2 before the cat
And the third ones after the cat usually where the exhaust exits the cat. Look for the wires leading to them from the plug which is usually about 12 inches away from the sensor. Hope this helps.
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Monday, July 21st, 2025 AT 6:49 PM
Tiny
KIMWILL1973
  • MEMBER
  • 3 POSTS
Do you have a repair diagram I can show my mechanic. He couldn't find 3 sensors. He installed 2 he could find. My car js still choking out/and hesitating and speedometer still jumping. So that he can get the third one installed. Thank you and I appreciate you.
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Monday, July 21st, 2025 AT 7:00 PM
Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Okay, usually they don't all three go at the same time most of the time you get one bad one did he scan it. If your mechanic changed them already and it's still having these symptoms I think it should be scanned to see if there's any codes so we can help you solve the problem. Correctly if you find any codes it might help a lot let us know. Hope this helps good luck.
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Monday, July 21st, 2025 AT 8:01 PM
Tiny
MECHTRIX
  • MECHANIC
  • 382 POSTS
Acually you might have 4 sensors on that model I believe they came both ways with 3 or 4. Either way, with the symptoms you're having, it needs to be scanned. Please let us know if you get any codes. Thanks, good luck.
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Monday, July 21st, 2025 AT 8:24 PM
Tiny
KIMWILL1973
  • MEMBER
  • 3 POSTS
He changed (2) O2 sensors. So maybe the 3th sensor he can't find is the one that is needed. So I'm assuming you could not provide me a diagram in this site.
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Tuesday, July 22nd, 2025 AT 10:17 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
So there are three oxygen sensors, two are in the exhaust manifolds bank 1 is on the right side of the engine. The third or secondary sensor is in the exhaust pipe after the catalytic converter. Check out the images (below). Let us know if you need anything else.
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Wednesday, July 23rd, 2025 AT 9:33 AM

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