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To Diesel "TDI" (VW engine“s) it happen a lot.
I also have a 2001 GOLF mk4 TDI (110kw) and I“m already at my 3th "MAF" sensor (Mass Air Flow)...
its BOSCH... and at the beginning.. it costs like 400$... since it happen.. a often... they recycle them.. and now.. for a refurbish it cost 120$.
I though.. only Diesel engine.. have those problems.