My 2008 Tdi does not have 12volts on pin 2 of the MAF plug (Black with green stripe wire)but it does have 5 volts on pin 4. I traced the wiring down to the main harness and it headed back inside the car ....BUT where it goes from there I have no idea. Does the 12v come from one of the many pins on the ECU or somewhere else.

Haynes manual does not show this detail. A friend looked up Autodata 2007 but again no detail on where the wires go ....just the pins in the MAF and the voltages that should be on each pin.

A wiring schematic of the sensors or just the MAF sensor would be appreciated if anyone has one out there to share please? Thanks in advance

Fault code is P0102 (MAF) with engine management light on........but car is still running fine ....not in limp mode.

Have you tried cleaning it? A MAF should have 5 volts max from the signal wire at wide open throttle.

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problem sorted . Fuse # 29 in the fuseboard beside A-pillar was faulty. 12v supply now restored to MAF sensor and P0102 fault code cleared with Elmscan 5 interface and OBD Wiz software. Thanks