Hope you can help, My A4 2.0 tdi 140 blb has the Check emmisons light on.
Took it to audi and scan came back as p0101 MAF "range performance"
So i ordered new Bosch MAF fitted it and all was well for 100 miles then it came back on, P0101 fault but this time "Implauasable signal"
Thought it may have been a spike so reset and came back on in 50 miles, Same implausable signal.
Cleaned out EGR and Throttle body that were really caked up but its back on after 20 miles, The car is smoking quite bad but mpg is still good and power is ok.
Any ideas guys as Audi want £105 PH and i havent got that as i used all my saving and then some to buy the car :/
Many thanks for looking.