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That truck has 4 o2 sensors, there are two catalyst converters on this truck as well. Bank one (Driver side), bank 2 (passenger side), sensor one is before the catalyst converter , sensor 2 after. There are two catalyst converters on this truck as well. Follow the exhaust system back from the engine and you will find them. A scan will tell you which one you are looking for.

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13y ago
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Q: Where is a 02 sensor in a 2004 Chevy avalance?
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