From Ross-Tech Wiki

16840/P0456/001110 - EVAP System: Very Small Leak Detected

Possible Symptoms

  • Malfunction Indicator Light (MIL) active

Possible Causes

  • Fuel Cap not fully attached
  • Evaporative Emission (EVAP) System leaking/faulty

Possible Solutions

  • Check Fuel Cap
  • Check Evaporative Emission (EVAP) System

Special Notes

  • On 2006 and 2007 Passat, check fuel cap part number. Updated version ends in "G". Please refer to Technical Bulletin 2016757 for details.