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O2 Sensor question

This is a discussion on O2 Sensor question within the GM Trucks forums, part of the Vehicle Specific category; Does anyone know what the thread size is for the O2 sendors on my 2001 5.3L silverado? I need to ...

  1. #1
    Junior Member ~Firehawk~'s Avatar
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    O2 Sensor question

    Does anyone know what the thread size is for the O2 sendors on my 2001 5.3L silverado? I need to re-tap the hole for one of my sensors and I dont know what size tap I need to look for.

  2. #2
    Member Nitrous's Avatar
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    White
    97 GMC with 02 LS6 engine

    Should be a M18 x 1.5 pitch . I've seen a few 14 MM also but it's more likely to be an 18 MM.

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