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· TOTM
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1,765 Posts
Anything else I should focus on? Maybe Bad cats?
Get a subscription to the shop manual so you can properly troubleshoot each code. Firing the parts cannon is expensive with no guarantee of results. Make sure your scan tool can do whatever the troubleshooting guide requires of it.

When a cat fails, it has its own codes, the only time there is a false positive is when there is a massive exhaust leak in front of them to the heads.
 
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