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There is one before and one after all catalytic converters.

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โˆ™ 2008-11-23 01:56:47
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Q: Where are the oxygen sensors located on a 2002 Monte Carlo SS engine?
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Where are the oxygen sensors located on a 1999 Monte Carlo LS?

It is located in the Y pipe of the exhaust.


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1)Upstream sensor is located in the "y" pipe ahead of the catalytic converter. 2)Downstream sensor is located between the catalytic converter and the expansion chamber.


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