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I have a light on that the local chevron says is a 420 code? I called the dealer and he says it may be the catalytic converter and that there is some kind of a flush that helps in most cases.. Then I hear from another engine savvy person, that you don't flush catalytic converters?? They thought it has something to do with the Exhaust system.. I have no warranty so am looking to trouble shoot before the dealer has too! I just received the airbag recall, that they now have the parts- so I will have them check it then also?
 

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Id recommend what RobXR said, the guy in the video really knows what he's doing. I have done several repairs per his suggestion and have had great success
 
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