Re: For 2003 Chevy impala LS 3.8L exactly how many O2...
Hello there are two 02 sensors on this vehicle, 02 sensor 1 {pre 02} is located in the rear exhaust manifold. the second 02 sensor {post} is located in exhaust pipe just behind the cat. converter
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hi were are 02 sensors locate at I have Chevy impala 2006 3.5 LS i know it have 3 of them I can't find the front one can u let me k ow it is please thank u
Get it scanned again. If you bought cheaper ones at the parts store instead of oem ones from the dealer you are probably going to be doing them again. The upstream and down stream 02 sensors communicate with each other so it could be the upstream sensors even though it says downstream. I ran into this problem myself.
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.
Bank 1 is the rear O2 sensor, but experience says to change both. The front one is right behind the engine in the middle of the engine compartment. The rear O2 sensor is on the top of the exhaust pipe, just behind the catalytic converter. But the same code that shows it is the O2 sensor (which is P0420), is the same code for the catalytic converter, or a vacuum leak. Make sure if you do change the catalytic converter, ensure that the new one is OBD-2 compliant. And the vacuum leak could possibly come from the manifold gasket. Let me know what the problem was!
I have replaced the radiator in my 2003 Chevrolet Impala LS. The car started running hot and shut down. Took it to a radiator shop and found a crack in the radiator. I have replaced 2 thermostats in the car already. I noticed water running from under my car today and it seems it was coming back out of the overflow. I am stumped as to what is going on with this car.
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