Z4-forum.com

Hi,
Just purchased a 09 Z4 2.0i Sport yesterday absolutely love it although have only had one day!

On way to work today I had the engine light come on (not the EML one) no loss of power or anything, I have an OBD scanner and that has come up with a P0420 code I have since cleared it and it hasnt come back on so far. I did put £40 worth of sainsburys fuel in yesterday by the way, and car has been sat around for a while (whilst awaiting sale)

One thing that I have noticed from looking online at previous MOT's is that in 2015 it had an advisory for 'occasional missfire during emissions test' and in Feb last year the following 'emissions readings irratic'

It was mot'd recently and there were neither of those advisories present so assume they were sorted, but I understand that the P0420 code can be because of a mis-fire. How would I know if car was mis-firing? (im not mechanically minded!).

Thanks in advance for any advice etc..

If a trade sale, report and give it back to them to fix.

Petrol quality is a possibility, but a single misfire code to me would get me looking at coil and plug first in that order, obviously checking connections.

Do a search of the e85/86 problems topics for "P0420 code" and you will see it's pretty common on the 2.0 in particular, sometimes simple, but unfortunately not always easy to diagnose and has driven some 2.0 owners to give up!

You may have discovered why the previous owner sold it on, if it was a trade sale you need to return it asap for verified repair or money back if it was me.