16841/P0457/001111
From Ross-Tech Wiki
Table Of Contents
16841/P0457/001111 - EVAP System: Leak Detected (Check Fuel Cap!)
Possible Symptoms
- Malfunction Indicator Light (MIL) (illuminated)
- Tank Cap Amber Warning (illuminated)
- Stored fault code(s) in Engine Control Module
- Possible fuel odor, especially near rear of vehicle after refueling
Possible Causes
- Fuel Tank Cap not closed properly
- Fuel Tank Cap seal damaged, hardened, or missing
- Evaporative Emission (EVAP) System leak (small to large)
- Leak Detection Pump (LDP) or Leak Detection Module fault
- Cracked or disconnected EVAP hoses or vapor lines
- Damaged charcoal canister or vent valve
Possible Solutions
- Inspect Fuel Tank Cap and seal for damage, debris, or missing O-ring
- Verify Fuel Tank Cap closes securely and clicks into place
- Check Fuel Filler Neck for damage or corrosion
- Perform Visual Inspection of Fuel Tank, EVAP hoses, canister, and fittings
- Perform EVAP leak test (with smoke test equipment)
- Check operation of Leak Detection Pump or system vent valve (if equipped)
Special Notes
North American market vehicles (only)
- For the 2019-2021 Tiguan 2.0L (DGUA) engine, please see Volkswagen Technical Tip 01-21-01 (2062754/1)
- For the 2018 Atlas 3.6L (CDVC) engine, please refer to Volkswagen UPDATE Technical Bulletin, July 19, 2018, 23X1 UPDATE – ECM Software Update (FED_EMS)
- For the 2015 - 2016 Passat, please refer to the Volkswagen Technical Tip (26-16-02) - Loose Evap Lines...