Hi guys! hoping somebody can help me with my issue. My Malfuntion indicator light came on while i was driving on the motorway doing about 70mph. I have got the car for well over a year now and its done 58000 miles and had its major service last august. Car has been completely fine no problems at all until this light came on.

I read into forums and manage to get a hold of an OBD-II scanner. Pulled up the codes and P0420 came up- catalyst system efficiency below threshold (bank 1)

Resetted the code, as my car has a de cat on it rather than a catalytic converter. Light didnt come back on again until i was once again driving on the motorway driving over 60mph seeems to trigger it. I took it into Honda and they diagnosed it as a catalytic failure. Honda was no help at all when i started mentioning o2 sensors as the car had a de cat fitted when i bought the car - (dealer never told me)

so my question is - is it ok to use aftermarket catalytic convertors? coz honda is quoting me £1400 for a cat convertor, and i can get one for £200.

Any one ever had a problem similiar to mine? like whenever you go over a certain speed limit it triggers the MIL?

any help will be appreciated - thanks

 

An aftermarket cat made for this car should work fine but I would try and find a factory one that a track guy is selling. I bought mine recently for 60 bucks from a local guy on the boards.
GL

BTW it seems like you don't have any engine management so I'll move this to the correct forum.