Location and number of O2 sensors

Tiny
MRSTONE2007
  • MEMBER
  • 2004 CHEVROLET IMPALA
Six cylinder two wheel drive automatic 65,000 miles.

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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Thursday, February 7th, 2008 AT 8:15 PM

17 Replies

Tiny
DENNYP
  • EXPERT
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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Wednesday, February 13th, 2008 AT 10:34 AM
Tiny
MRSTONE2007
  • MEMBER
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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Tuesday, February 26th, 2008 AT 5:19 PM
Tiny
TRENTDENNIS
  • MEMBER
  • 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 cannot locate the second sensor.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
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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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
SAMIMPALA
  • MEMBER
  • 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 is 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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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
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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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
MAURY
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 93,200 MILES
Could you tell me the location of the oxygen sensor that needs to be replaced?
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
You have four could you provide code in P0xxx format.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
AIRBORN1357
  • MEMBER
  • 2001 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Where is the o2 sensor located and how do you replace it?
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
DENNYP
  • EXPERT
Located in the exhaust pipe. One in front of the catalytic converter, and one behind the converter.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
DENNYP
  • EXPERT
Unplug the sensor and use a 7/8 wrench or O2 sensor socket to remove the sensor.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
DANNY BENNETT
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 972,000 MILES
Got a flag on the O2 sensor.
P0140: O2 sensor circuit no activity detected (Bank1 Sensor 2).
Where is the sensor located?
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
RHALL77
  • MEMBER
Under the car back by the catalytic converter.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
KELLYMARIE23
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 92,000 MILES
Where is the O2 sensor located on my car with a 3800 in it?
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,
I believe there are more than one. Check on the exhaust manifolds, the down pipe from the manifold, and both before and after the catylatic converter.

Let me know what you find.

Joe
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
DJMISTASPOT
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 111,700 MILES
Where is bank 1 sensor 1 located on my car? Thank you
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
It is in exhaust manifold rear of the engine compartment.
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Wednesday, August 1st, 2018 AT 7:28 PM (Merged)

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