Question about 2004 Chevrolet Impala

1 Answer

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?

Posted by on

  • 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.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.


    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

  • Expert
  • 124 Answers

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.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Where are the 02 chevy impala 3.8L o2 sensor locations, I only see three. the top bank one sensor 1 is stripped out, how do i get that one out?

you can apply pressure to the sensor while undoing it to force it out or you will have to cut out the thread area and get an O2 sensor bung hole replacement at an auto supply store and weld into place and install a new O2 sensor. bank 1 sensor 1 is located in the front pipe off the manifold that has cylinder #1 on and bank 2 sensor 1 is on the side that cylinder #2 is on like sensor 1. sensor 3 is the one just before the cat.

Sep 17, 2014 | 2002 Chevrolet Impala

1 Answer

I have a 2004 Impala with code PO131 and PO171.

o2 sensor is by the cat and sometimes there is 2 of them one before and one after the cat id look on the exhaust manifold most likely there is one there

Dec 05, 2012 | 2004 Chevrolet Impala

1 Answer

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.

Sep 12, 2011 | 2004 Chevrolet Cavalier

1 Answer

O2 sensor bad, when I have auto zone hook up and test they do show o2 sensor bad, but the codes are saying sensor 3 and 4 are bad. it doesn't say "bank 1 sensor 2". how do I know what...

You will have a total of 4 O2 sensors, two on the left (driver's side-Bank 1) and two on the right (passenger side - Bank 2). Sensor 1 is before cat. convertor and sensor 2 after cat. converter. Hope this helps.

Sep 09, 2011 | 2001 Dodge Dakota

1 Answer

I have a 96 impala o2 sensor out bank1 sensor2 where is that located

Sensor 2 should be in or immediately after the catalytic converter for bank 1, assuming that its true dual exhaust and dual cat.

Sep 09, 2011 | 1996 Chevrolet Impala SS

1 Answer

My check engine light won't go out. did have a misfire code corrected that with a set of plugs and wires. auto zone said scanner was showing a cataletic converter. I have good power. no starting problems....

If was you o2 sensor the code would say o2 sensor bad. Your catalytic convertor may not be heating up enough to make the emission computer happy and is sending a trouble code.

Feb 04, 2011 | Saturn Ion Cars & Trucks

1 Answer

Where are the o2 sensors located on 2004 dodge durango and how many are there?

I believe you may have three (3) O2 sensor, (2) of the sensor is on ether side of the exhaust down pipe and some times called up stream O2 sensor, the third O2 sensor know to some as the down stream O2 and is after the Catalytic converter.
The up stream O2 monitors the left and right side banks and sends signals to the ECM to make the adjustments to the injectors to keep the proper air/fuel ratio.
The down stream O2 monitors the catalytic converter and sends signal to the ECM if the catalytic converter has gone bad.
Good luck and hope this helps. If you get it scanned at Auto Zone, they should be able to let you know which O2 has gone bad so as to not change all three. You could always check the wire harness to the down stream O2 for corrosion.

Jan 29, 2011 | Dodge Durango Cars & Trucks

2 Answers

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

I have a 2002 Impala with 3.8L, and just replaced my Bank1 O2.
It is located between the firwall and the middle of the engine, straight down past the spark plugs. Maybe 12 inches from the top of the engine.
As I recall the plug for the sensor is clipped to a bracket at about spark plug level.
I recommend using the crow foot style wrench to remove and install.

Jan 04, 2011 | 2005 Chevrolet Impala

1 Answer

02 censor

Your car should have two O2 sensors. One will be located after your catalytic converter. The other one should be located before your catalytic converter somewhere between your headers and your cat. Rarely, on some vehicles, there's a 3rd O2 sensor which is located also somewhere between the catalytic converter and the headers.

Oct 29, 2009 | 2004 Chevrolet Impala

2 Answers

Location of oxygen sensor

Under the truck, driver side exhaust pipe, there are 2, 1 is before the catalytic converter, the other is after. They screw into the side of the exhaust pipe.

May 29, 2009 | 2004 Dodge Ram 1500

Not finding what you are looking for?
2004 Chevrolet Impala Logo

Related Topics:

214 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

81342 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides