About two weeks ago P0420( Catalytic Converter Below Efficiency Bank 1) Or whatever the error code read. I knew for sure it was Bank 1 though. So After I read the code I filled up my gas tank and threw in a whole bottle of fuel line cleaner, and just today the CEL finally went off. Do you think the problem is fixed now because the CEL was coming on because of a dirty fuel injector or something?
2003 Ford Focus SE Sedan.
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