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07 Yukon 5.3
Got a p0420 and a po430. replaced with new cats still have the 430. replaced all oxygen sensors, still have the 430. No ECM codes vehicle runs great. Scanned vehicle after clearing the 430, everythings spot on. Did a smoke test no leaks anywhere. Had a new MAF out on. After driving about 50...- billyb5755
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- Forum: Engine & Drivetrain
