O2 sensors?

Tiny
BRNFRRST
  • MEMBER
  • 2001 OLDSMOBILE AURORA
  • V8
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
My check engine light came on and had an Auto Zone employee put a computer on my car to see what caused the light to come on, it read O2 sensor issue. I replaced 2 sensors, and still have problems, I went back to Auto zone and he now tells me I have 3 to 4 O2 sensors, can you tell me how many and where they are. I also now get other readings that saya MAP sensor, MAf sensor, Pedal Throttle Position sensor, and Knock sensor. It is driving a little better, but feels like the throttle is stuck open when driving down the highway.
Monday, June 22nd, 2009 AT 9:14 AM

3 Replies

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
You have 3 O2 sensors on your vehicle. One on each side of the cylinders before the catalytic converters, and one on each exhaust pipe after the catalytic converters.

Also, it is very unusual for all of those sensors to go bad at the same time. This hints at the possibility that your computer is faulty, or the wiring harness to the computer has some bad/corroded connections.

Your powertrain control module is located under the hood, right next to the brake master cylinder. I don't suggest that you mess with that thing yourself. (Unless you are an A.S.E. Certified mechanic)

If AutoZone can't tell you more about the possibility of you computer being faulty, go to a competent mechanic. Their computers are much more sophisticated, and they'll usually do a free estimate.

Here is a guide to help walk you through the replacement and diagrams below to show you the oxygen sensor location for your car below.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Was this
answer
helpful?
Yes
No
Thursday, December 31st, 2009 AT 11:10 PM
Tiny
AURORA2001
  • MEMBER
  • 1 POST
  • 2001 OLDSMOBILE AURORA
  • 3.5L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
I have a 2001 Oldsmobile Aurora 3.5 and my questions is were are the 02 Sensors located and how many are there?
Was this
answer
helpful?
Yes
No
Tuesday, July 21st, 2020 AT 5:29 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
There are 4. 2 upstream and 2 downstream sensors

they are below the exhaust manifold and the downstream are behind the cat converter

Roy
Was this
answer
helpful?
Yes
No
+1
Tuesday, July 21st, 2020 AT 5:29 PM (Merged)

Please login or register to post a reply.

Sponsored links