VW boost
If the MIL is on and DTC P00AF is stored in the ECM fault memory on a 2013 VW Golf, Jetta, Beetle, Jetta Sportwagon, Golf Wagon or Passat equipped with a turbocharged 2.0L engine, this indicates a Turbocharger/Supercharger Boost Control “A” Module Performance issue.
VW notes that if this DTC is present, do not replace any parts for this fault code. Instead, you are advised to contact the Volkswagen Technical Helpline for diagnostic information.