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

\015 How many oxygen sensor's, and where are they located on a 2003 chevy impala?\015 Posted / edited by AnonymousUser on : 15-01-2018

Answers :

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.
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