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MK2 P0420

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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. 

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Ok so this came back. I'm yet to run any cleaner through the engine. 

Any advise? Please?

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