Question about 1999 GMC Sierra

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Need to know where sensor 1 (oxygen sensor) on bank 1 is located

The engine is a 5.3L in a 2005 GMC 1500 sierra crew cab Z71

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  • Anonymous Mar 18, 2014

    Don't know were sensor is located

  • Anonymous Mar 27, 2014

    bank 1 sensor 2

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  • 196 Answers

It would be on the left header pipe as you sit in the truck. Its the sensor in front of the cat

Posted on Jan 17, 2009

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