Question about 2004 Chevrolet Impala

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Trying to replace two O2 sensors on my 2004 Impala SS. I have a schematic from Auto Zone that shows three sensors before the cat. converter. I can only find one. Where can I get a correct schematis?

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  • warsaw44 Dec 29, 2008

    The schematic I have shows 3, however there is not one in the exhaust manifod nearest the radiator and I can't see one on the other manifold either. Is it possible that I may have an early year edition that was changed later? All I can find is the one just in front of the converter and the one just after it.

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There are three. One should be just in front of the converter and the other two are in each of the exhaust manifolds.

Posted on Dec 27, 2008

  • mikehumble Dec 29, 2008

    All vehicles manufactured in 1996 and newer are required to have at least 3 O2 sensors. I am showing two in front and one behind the converter. I am not sure exactly were the other one is but I believe it is on the back side of the motor near the manifold crossover.

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1 Answer

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My check engine light came on and I took it to auto zone and they siad it was the oxygen sensor. I do not have a book on my car and I don't know where the oxygen sensor is located on my car. I have a...


the o2 sensor is located in the exhaust stream-from the exhaust headers, they are usually not more than 18 to 24 inches from the exhaust as it exits the engine-follow the pipes, they are in front of the catalytic converter-if you have a 4 cylinder, you only have one in front of the cat-if you have a v6, you have two. the o2 sensors BEHIND the cat only monitor the efficiency of the cat itself and have no bearing on driveabillity-concern yourself with the front o2 sensors, they control how the vehicle runs-they get 'tired' as they get older, and should be replaced as you get closer to 100,000 miles. It will generally run better and get better gas mileage.

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2 Answers

Where is the oxygen o2 sensor located on 2004 impala bank 1


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Jack up the passenger side or onto ramps to make easier acess.

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1 Answer

02 censor


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