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  1. Engine & Drivetrain
    2010 Acadia. I have fault p0430. I replaced bank 2 downstream o2 sensor, fault returns every 25-50miles. Seen the third (the 3way) cat and noticed no sensors behind it. Anyone ever swapped that third cat with the ones that are actually being monitored? its clear that the third cat (not having...
  2. General Tech
    [SHORT STORY] I need a Y pipe to rear (Not bank 1 or 2) converter gasket and the original gasket is way to big. So are the aftermarket gaskets. [DETAILS] Ok, so, I have a 2011 acadia denali. After we did the timing chain the engine blew, sad, and we had to buy another. We'll, the new engine has...
  3. Engine & Drivetrain
    Howdy, I am going to check out an 09 SLT AWD in a bit. The seller states that all 3 catalytic converters were replaced in the last 2 years and that all O2 sensors were replaced less than 10,000 miles ago. Also states that all coil packs and plugs were replaced less than 10,000 miles ago as...
  4. General Tech
    I have had to replace all CC's on my GMC Acadia twice and I still get a code saying they are not operating properly. Any one else seeing this?
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