Question about 2004 Chevrolet Impala
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Posted on Jan 02, 2017
SOURCE: 04 Monte Carlo 3.4L won't
If the code you have is p0420, then it sounds like you mayu have a bad catalytic converter. This will inturn cause the oqygen sensor codes, It may still be under warranty. The warranty is up to 125k miles.
Posted on Dec 01, 2008
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
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