The MAF controls the fuel/air mixture which would explain your CEL coming on at certain RPMs. Not having this problem before, how I would go about it is.. 1. Check your Air Filter to see how dirty it is (and related parts, tubing, airbox). 2. I'd get some MAF cleaner (make sure it's MAF cleaner, the MAF is very delicate), and spray the MAF down and let that dry out. Make sure everything is clean and back together correctly afterwards. If that doesn't work, I'd say your MAF has seen better days and needs replacing. That's my take on the situation, if anyone else has suggestions, please feel free to jump in. __________________ 
BMWCCA #403399
2012 Mini Cooper S Clubman, 6-Speed
Loaded
2001 325xi, Winter Package, 5-Speed
Traded
1998 318ti, Active, Automatic, TOTAL LOSS R.I.P. 10/20/08
Bilstein Sport Shocks/Struts . H&R Sport Springs . Strut Reinforcement Plates . RSM Reinforcement Plates . Fogg Airbox . X-Brace . Bosal Brospeed Catback |