Hi Guys

Just a quick question, i have an August 2006 BF Series 1 Sedan and i am fitting some extractors and hi flow CAT in the next week. I am not sure if i have 1 or 2 O2 sensors - is there an easy way to tell? Did the series one come with 2x O2 sensors after a certain time?

Most appreciate the help

Cheers

Phil

bf's all should be euro4 so it should have one before and one after the cat. you will most probably need a tune after the headers and cat goes in as they will flow more exhaust gas than stock. It will always throw the engine check light on.

Thanks very much mate, i suspected it may have 2, I didnt know about the tuning though so will have to look into that