AO Gold Member
Join Date: Jun 2007
Location: United Kingdom
Re: 147 2.0 petrol losing power under 2000 RPM
Sounds like the MAF to me. (Mass Air Flow sensor)
It is the part half way up the air intake pipe. Disconnect the plug and see if the car runs any better (the engine management light will come on, but will go off again when reconnected). If it does seem better, then replace the MAF with a genuine BOSCH (NOT EBAY) part.
With the MAF disconnected, the car may well misfire when initially accelerating, but it should be better once running than a faulty MAF.