Really hope one of you are able to help
This is the situation, black smoke coming out of the exhaust upon accelerating and moving off from a stationary position. The engine management light will appear after few day of it being reset by a family friend look at the car who is also a mechaninc.
Work undertken so far:
*MAF changed follwing the respective code being reportd on the computer the mechaninc has: P0101/000257 - Mass Air Flow Sensor (G70): Implausible Signal
*EGR valve cleaned (not removed)
*Turbo cleaned (not removed)
*Diesel addative run through car in an attempt to clean up
*Pressure test carried out - no leaks
I am not sure the diagnostic computer he has but it cost him approx £2k it cover all modern car. He did a full diagnostic scan and picked up all the historic error codes.
Once the engine managment light is cleared a few day later it reappears with the MAF error code. The MAF has been changed twice as the dealer agreed to swap out due to the same error code but to no avail.
Initially I had a severe loss of power but following a MAF change and some additional software updated the power is back and turbo is behaving as expected.
Fuel consumption is dropped drastically to approx 36mpg so really need to get this sorted as it has been going on for a few weeks now.
Any help appreciated as to next steps, please let me know if you require any further information.
Thanks in advance