comments:
I know this is an older thread but I wanted to submit my fix for my Mini with the same error code I just now fixed. For my 2011 Clubman S with code P0456 I replaced gas cap, the surge valve, performed 2 smoke tests by 2 different mechanics, replaced fuel filter and o-rings, spending way too much money and time. The fix was a $21 part from Amazon, the leak detection pump, which is attached to the charcoal canister in front of the RIGHT REAR tire. I think it was a couple bolts and some plastic rivets to pop off and the canister came down and then super simple to replace the pump. I would definitely try this first if you have P0456 instead of all the other remedies on the net that take time and money. This NON AFFILIATE (I aint gonna make money if you click it) link to the part I bought and installed and successfully finally cleared the code is: https://www.amazon.com/dp/B0DHZDJFGZ?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 Good luck