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  1. Engines and Technical Discussion
    I keep getting a check engine light code for P0420 Catalyst System Efficiency Below Threshold (Bank 1) on a 2016 Chevy Trax. I change both O2 sensors out and even the Catalytic convert. I went with Certified GM parts to replace the bad parts with. I can reset the code but it comes back with in a...
  2. Engines and Technical Discussion
    I have a 2015 trax, Only has about 67000 miles on it. Took it in for an oil change, oil was leaking, only had about 2 qts left. Not sure when it started exactly, as there's never been oil on ground. They couldn't actually work on it that day, so they topped off my oil and said I was okay to...
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