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17/04/2024 12:50 pm
Topic starter
So I got a 2008 GMC Envoy with the 5.3 in it and I got these two engine codes and I'm wondering how I can fix it? https://ibb.co/JCtZ6SC
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17/04/2024 1:54 pm
This site might help you diagnose those codes https://www.autocodes.com/p0420_chevrolet.html
One thing that many people make a mistake of doing is replacing the cat without finding out what problem made it fail
