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Need to know how many oxygen sensors

Tiny
MAGANAROBT
  • MEMBER
  • 2012 CHEVROLET IMPALA
  • 1.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
Need to know how many oxygen sensors the car listed above has. The exact location and how to get to the bank 1 sensor 2.
Saturday, September 28th, 2019 AT 9:29 AM

18 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Here is a tutorial showing what is involved for an 02 sensor replacement. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

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

I've attached below pictures of your vehicles 02 sensor locations.Hope this helps and thanks for using 2CarPros.

Danny-
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Saturday, September 28th, 2019 AT 6:56 PM
Tiny
JBUSWELL
  • MEMBER
  • 1 POST
  • 2006 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 50,000 MILES
I need to change the bank 1 sensor 1 oxygen sensor can you help me?
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Here are some guides that will help with this:

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

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

Plus here is a video on a different vehicle but it is similar enough that you should be able to get useful info out of:

https://youtu.be/B4CAou7i7Io

Below is the process from the manual that will help with this. Please let us know if you have other questions. Thanks
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
LIVERAHOPE1012
  • MEMBER
  • 1 POST
  • 2006 CHEVROLET IMPALA
  • 3.5L
  • V6
  • AUTOMATIC
  • 176,000 MILES
I heard a rattling under my car and noticed that my O2 sensor was lose and looked like it needed replacement. I read online that you should replace all of them if one is bad, and it stated my vehicle has three. I found the second O2 sensor on the back side of the engine by the fire wall. I looked in the front driver side where they said the third should be and I can't locate it. I have looked all around and so has my boyfriend. I feel like the third one doesn't exist! If you could give me a diagram of sensor locations that would be amazing. Please help :(
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

First, there are only two sensor in your car.

Second, you do not need to replace all if one is bad. Just the one that is bad is all that needs to be replaced.

I attached pictures of the two sensors on your engine.

Roy
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
JS785
  • MEMBER
  • 1 POST
  • 2005 CHEVROLET IMPALA
Where are the oxygen sensors located and can I change them myself?
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Here is a guide that will help with this:

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

Below you will find the process from the manual on how to replace the sensors. Please let us know if you have other questions. Thanks
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
MRSTONE2007
  • MEMBER
  • 2 POSTS
  • 2004 CHEVROLET IMPALA
My car has been pulling an OBD code for the Bank 1 Sensor 1 oxygen sensor, but I cannot find it. I can only seem to find one before the catalytic converter and one after, so am I overlooking one or are there only two? If there are only two, why would the same code continue to flash if the two sensors were replaced? Please help.
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Here is a guide to help you change the sensor out and diagrams below that show the location of the sensors:

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.

Cheers
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
MRSTONE2007
  • MEMBER
  • 2 POSTS
The code it is pulling is P0135. I have replaced the one before the catalytic converter, but the problem persisted which led me to believe there is another which I found and fixed thanks so much I will get back to you if I have another problem. I love this site.
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
TRENTDENNIS
  • MEMBER
  • 1 POST
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Trying to find the location of the O2 sensors. Found one on the rear of the engine, but can't locate the second sensor.
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Heated Oxygen Sensor (HO2S) Sensor 1 (3.4L VIN E)In exhaust manifold, rear of engine compartment. See Fig. 36.
Heated Oxygen Sensor (HO2S) Sensor 1 (3.8L VIN K & VIN 1)Above exhaust manifold. See Fig. 56.
Heated Oxygen Sensor (HO2S) Sensor 2 (3.4L VIN E)In exhaust system, behind catalytic converter. See Fig. 45.
Heated Oxygen Sensor (HO2S) 1 (3.8L VIN 1)In exhaust manifold, rear of engine compartment. See Fig. 31.
Heated Oxygen Sensor No. 2 (3.8L VIN K)In exhaust system, behind catalytic converter.
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
SAMIMPALA
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
I am trying to change my front o2 sensor by myself so I was wondering what id the best way to locate it? Can I reach it from the top of the engine or should I look from the bottom?

Thank you
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

Here is a guide and some diagrams to help you see what you are in for when doing the job:

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.

Cheers
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
LATRICIA LEGER
  • MEMBER
  • 2 POSTS
  • 2001 CHEVROLET IMPALA
  • 3.4L
  • V6
  • AUTOMATIC
  • 250,000 MILES
I had a code reader hooked up to my car it read that I needed to change the cam shaft sensor and oxygen sensors and catalytic converter. I replaced the cam shaft senor. It doesn't want to pick up speed and overheating after you get to 50 mph. Can't figure out why it's overheating now. I haven't replaced the rest of the stuff yet. So my question is, how many oxygen sensors do I need to get and does the catalytic converter have to be welded I place or not? Thanks in advance!
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Codes do not tell you to replace anything. They just indicate the system that has a fault.

Can we start with the codes?

Your car has 2 sensors and the catalytic converter is a direct fit.

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

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

I attached the location of the sensors and the catalytic converter for you.

https://www.2carpros.com/articles/catalytic-converter-replacement

Roy
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
LATRICIA LEGER
  • MEMBER
  • 2 POSTS
I don't know the exact codes. Other than that I was told that I have to place all that.
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would not like to see you waste your money on replacing parts that were not necessary.

Can you contact the person that told you this information and get the codes?

You could also go to a parts store and have them read for free.

Roy
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Saturday, May 8th, 2021 AT 1:17 PM (Merged)

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