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Possible ground issue
Recently I had to do a complete engine build on a 2015 6.2 LT in a Yukon Denali for a broken valve spring resulting in a dropped valve. Since getting it back in the road I've had a few electrical gremlins. Mainly throwing a P0420 catalyst low efficiency code that wasn't there before the new...- Double0Redneck
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- Replies: 14
- Forum: Engine & Drivetrain
