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These articles discuss the Mass Air Flow sensors in the mk3, mk4, and mk5 VW TDI.
http://www.myturbodiesel.com/1000q_how_to/multi/MAFfaq.htm
The mk4 MAF is problematic, so there is also a separate writeup on how to test and replace it.
http://www.myturbodiesel.com/1000q_how_to/a4/maf.htm
http://www.myturbodiesel.com/1000q_how_to/multi/MAFfaq.htm
The mk4 MAF is problematic, so there is also a separate writeup on how to test and replace it.
http://www.myturbodiesel.com/1000q_how_to/a4/maf.htm