Question about 2004 Chevrolet Impala
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Posted on Jan 02, 2017
There are 2 oxygen sensors on the 2004 Impala, located under the car near the CAT converter.
Jack up the passenger side or onto ramps to make easier acess.
Posted on Feb 03, 2011
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
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Feb 11, 2017 | Cars & Trucks
Jun 22, 2014 | 2004 Ford Freestar
Dec 08, 2013 | Cars & Trucks
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.
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.
Aug 25, 2011 | 2006 Chevrolet Impala
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
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