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p0128

  1. 07.5-10 LMM Duramax Powertrain
    Not my picture but recycle reuse. Seems I have 2 sensors there. Can someone please explain what each of these are for and if you know the part numbers it would be a big help. I read an old thread on here and there was speculation that the 2nd sensor , I assume the back one is for an option...
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