Tony Bickers
The 420 code will be back, can take a month or longer to reflag that code.As to after market "type approved" cats, not worth the wrapping paper that they come in
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Recently had an 01 Accord 2.0 in that flagged the 420 code on the way back from having a new downpipe and cat,managed 10 miles before the MIL came on and that was a Klarius type approved cat!
Message Thread 
Vauxhall Corsa Z10XEP 2008 - O2 sensor fault, code P0420 # - Dave Emm October 14, 2013, 8:09 am
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on October 15, 2013, 5:55 pm, in reply to "