Need some technical info .

Got a bmw 320 4 cylinder 2000 x reg coupe ,

Origional fault was management light on 2 codes stored
135 cmp sensor cam
171 fuel adaptation

replaced cmp 135 code cleared no longer present ! but 171 fuel adaptation will clear but come on a day or so later thus putting mil light back on has been to bmw where they advised to change maf sensor that was carried out mil still comes on !
all sensors look ok and within limits via live data

Any ideas as I have not got much hair left ! .



Regards Doug .