Solenoid that controls the flap inside the intake manifold.
Volkswagen and Audi models have a tendency to give drivers a P2004 or P2015 error, which is basically a Flapper Sensor Failure code.
FITS: All Mk5 Golf/Jetta, B6 Passat, EOS, Audi A3, B7 A4 2.0T FSI
NOTE: Will not fit 2.0T TSi engines 2008.5-up
