I recently got a yellow engine light which coded out to P0420 (catalytic converter) on my low mileage 2010 justa. The light stayed on for about a week and then disappeared with no corrective action on my part. Do MINIs throw spurious codes (my Miata did)? Any thoughts?

 

Chances are, it will come back at some point. I had something similar, got a CEL and slightly reduced power. After a few miles, CEL turned off and car returned to normal. About a month later, exact same problem. A couple of miles, CEL turns off. I tried pulling the code, nada. Finally got around to taking it to the dealer (still under warranty). It had a couple of BMW codes my reader can't read. To make a long story short, had a flaky VANOS solenoid..

 

0420 is catalytic conversion inefficient. On an older n12 motor, you should take it to the dealer. There is a service action for replacing the manifold and cat on n12 motors. By emissions law they have to replace it under warranty as long as nothing is modified. And I don't think you have to worry if your stock. I have the same code on my 12 justa but that's because I have no cats slight modifications!

 

It's a 170 mi round trip to the dealer. I'll just wait and see if the code reappears.

 

The code will come back and eventually stay on.

 

Just an update: The warning symbol went off and has not reappeared for 2 months

 

2010 MC (pure silver), JCW grill, Wipac stainless driving lights, Union Jack mirrors, DIY front and rear oem fog lights, Cooper S fuel cap, Union Jack scuttles, Helix short shifter, FES Auto Sport, NM torque arm, Alta 22mm rear sway.

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Your bone stock came with all that ?

 

Well no, I might have added a few accessories but the power plant is still stock.

 

what mileage did your code ( p0420 ) start mine has 108,807 miles, thax

 

I have a cat from a 2013 car with about 10k miles for sale .I went catless.

 

what brand is it ? and how much ?

 

Its MINI OEM. $150 plus shipping from Dallas. Send me your email or text number and I can send pics.

 

thanks for the offer, the wife wants to go with a new one.