Help! Car runs better with engine management light on
 

Right I've been having problems with fluctuating revs while driving. I've replaced the mass sensor, cleaned mapp.

After replacing the mass air flow sensor it was still the same, I unplugged it a drove a short distance to see if it made any difference, sadly no.

Obviously the engine management light came on with the maff being unplugged. So I plugged it back in but couldn't clear the fault until I was home.

So I'm driving around with the engine management light on with the maff plugged in and the car runs perfectly lol no fluctuations in revs at all, I get home clear the fault and its back again 🤔🤔 any ideas.

I've ordered BMW Carly for tomorrow

Make, model and mileage? You need to get a copy of INPA and install it on a laptop. It will save you a lot of headaches.

Its odd that you have the MAF plugged in and the MIL did not go away. Its a self correcting message.

With the lack of info no one will be able to help. You might need a software update or have a vacuum leak. Codes are needed to start diagnosis with BMWs

sorry mate yes it's a e60 525d m sport 2007 with 135k on the clock. I've only owned it a few months now.

I have inpa at home so will give it a scan tomorrow and post the results see if anyone can help.

Just strange the car was fine with the engine management light on 🤔