cbirchy87 Posted June 17, 2018 Share Posted June 17, 2018 Hi. on my way home today this error code appears. Its linking to the CAT on bank 1. My car only JUST passed the MOT in sept due to emissions I had to replace a cracked coolant tank.Not sure if fitting this plus the new air filter fix it. However! this code has appeared today i did have the aux belt replaced last week in case that is linked. I have cleared to code to see if it comes back. # Would it be worth running come CATCLEAN through? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
cbirchy87 Posted July 30, 2018 Author Share Posted July 30, 2018 Ok so this came back. I'm yet to run any cleaner through the engine. Any advise? Please? Quote Link to comment Share on other sites More sharing options...
cbirchy87 Posted July 31, 2018 Author Share Posted July 31, 2018 anyone? Quote Link to comment Share on other sites More sharing options...
FatHead1979 Posted August 1, 2018 Share Posted August 1, 2018 Unfortunately it appears that there are a number of possible causes for that DTC. P0420 DTC Quote Link to comment Share on other sites More sharing options...
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