Dynamic pressure flap

[MBEN]

I have a fault which sounds like a sticking flap in my aircon which happens even when it's switched off but gets worse when on recirculate.

Having plugged my TDI 130 into Bosch diagnostic equipment I get a fault code
'O4FA Dynamic pressure flap serometer' and 0318 oil pressure switch air con, however when I erase the faults only the O4FA remains.

Does anyone have experience of the fix for this problem?

Thanks.

[Hex69]

Try searching for 'Recirculation Flap' in the B5 forum, it's a common problem :mad: