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Oxygen sensor on 2002 impala 3.4l - 2002 Chevrolet Impala

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Posted on Jan 02, 2017

  • 33 Answers


Usually oxygen sensors are attache to the exhaust, one after the exhaust manifold and one right before or after the CAD. That means some cars have two.

Posted on Oct 18, 2009

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SOURCE: Where and how many o2 sensor's on a 2003 chevy impala?

There are two sets of 02 sensors on most cars today. On set is set directly behind the header, one on each side, if it is a V engine. This set is used for the engine's ECU to control timing as well as other variables. The other set is placed on a bung in your Catalytic converter. This 02 sensor is used for emissions purposes only.

Posted on Jun 01, 2010

SOURCE: I have a 2001 chevy

Bank1 ---is always the side of the engine cylinder #1 is on
Bank 2 --- the other side

Sensor1---the ones closest to the engine either in or just before the converter
Sensor2 --- is the down stream or monitor sensor in the outlet of converter

Just replace all upstream O2 Sensors,ones before the converter by 100,000
miles or in your case when they fail

Only a guess but #1 may be on the left side,you don't do just one if you have more
You don't need to do the rear sensors though

Posted on Sep 21, 2011

  • 987 Answers

SOURCE: Have a 2002 chevy impala with a 3.4L V6 that needs

Have it scanned from any parts place for free and also ask them for a print out of the location.

Posted on Oct 12, 2011

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1 Answer

How much would it cost if i take my 2001 impala to a mechanic with codes p0135 and p0141?

your fault codes say
its just the one front bank 02 sensor

wise to do both

1/2 hour job x workshops hourly rate .plus parts
any more and they are having a lunch break
How to Change Upstream Oxygen Sensor on 2005 Impala

Oct 24, 2016 | Cars & Trucks

1 Answer

Where is the oxygen sensor on a 2002 Chevy impala 3.8 ls

Should be one in front and one after the catalytic converter.

Sep 05, 2014 | Cars & Trucks

3 Answers

2002 Chevy replaced Egr valve and oxygen sensor 2says not ready for Egr and evap

Replacing parts on the chance of solving the problem can get expensive. Take it to someone who has a scanner tool to check the sensors. Sound like you have a sensor not working.

Jun 18, 2014 | 2002 Chevrolet Impala

1 Answer

Have a 2002 chevy impala with a 3.4L V6 that needs an oxygen sensor. Is there any way to tell which one and where are they located??

Have it scanned from any parts place for free and also ask them for a print out of the location.

Oct 12, 2011 | 2002 Chevrolet Impala

3 Answers

I am trying to locate the Oxygen Sensor on my 2003 Impala?

Chevrolet Impala comes equipped with two oxygen sensors, one on either side of the catalytic converter. Locating the sensors is as simple as crawling under the vehicle.

  1. Location
    • The bank 1, sensor 2 oxygen sensor is located downstream of the catalytic converter. To get to the sensor, crawl underneath the vehicle and trace the exhaust pipe until you reach the catalytic converter. Continue to follow the exhaust pipe until you reach the bank 1, sensor 2 oxygen sensor.

    • You should be able to identify the oxygen sensor as a single wire about 3 to 6 inches long. The oxygen sensor is mounted to the exhaust pipe and should slightly protrude from the pipe.

    • The oxygen sensor is an important part of the vehicle exhaust system. The sensor tests the amount of air in the exhaust stream. It then sends this information to the engine control computer, which determines how much fuel is necessary to maintain a proper air-to-fuel ratio.

If this free advice was helpful, a vote with the thumbs up would be greatly appreciated.

Aug 25, 2011 | 2006 Chevrolet Impala

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

I have a 2002 Chevy Impala 3.4L . I have had a check engine light and checked the codes , twice indicating a #2 oxygen sensor failure . I was told the car is operating in a closed loop mode , I have driven...

Hello! The #2 Oxygen Sensor is located "downstream" which means after the catalytic converter...The sensor is threaded and screws into the exhaust pipe to the rear of the converter...Downstream O2 Sensors are used to monitor catalyst efficiency while Upstream O2 Sensors have a pronounced effect on performance...Hence, engine runs fine...Problem is the vehicle will not pass inspection with a Check Engine Light on...The problem may be a bad ground, a contaminated sensor or a defective sensor...
Do you have a multimeter and a little experience using one? If not have the sensor replaced...If so, here is a procedure to check the vehicle's grounds...Set meter to X10 ohm scale...Place one probe on the center of the - battery post...The other on bare metal of the exhaust pipe...You'll need a long piece of 10Ga. wire...Reading must be zero or very close to it...If not, the O2 sensor is probably good and a ground strap needs to be installed...O2 Sensor pictured below...Cost is around $60 for the sensor and .5 hours labor...Guru.....saailer


Nov 18, 2010 | 2002 Chevrolet Impala

2 Answers

Where is the Oxygen sensor on an impala ls 2004

Good Evening. Even though there are 3 types of engines in the 04 Impala their localities are all the same. The upstream oxygen sensor is down on the rear exhaust manifold, and the downstream oxygen sensor is located under the vehicle behind the catalytic converter. They make special sockets for them and i would HIGHLY recommend using them. Hope this helps. If you have any more questions please feel free to ask.

Aug 16, 2010 | Chevrolet Impala Cars & Trucks

1 Answer


Usually oxygen sensors are attache to the exhaust, one after the exhaust manifold and one right before or after the CAD. That means some cars have two.

Oct 18, 2009 | 2002 Chevrolet Impala

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