16839/P0455/001109

16839/P0455/001109 - EVAP System: Large Leak Detected

Possible Causes

• Gas Cap loose/missing
• EVAP System Leaking

Possible Solutions

• Check Gas Cap
• Check EVAP System
• Check to make sure EVAP purge valve is not installed backwards

Special Notes

• When found in any model with a Gasoline engine that had a replacement in-tank fuel pump installed make sure the brand new or revised fuel pump does not require a cap per the dealer parts catalog! Failure to install a cap (such as part number example: 8E0-201-263-G) when necessary may result in a serious safety concern!
• For the 2013-2019 Jetta 1.4 engine that has one or more of the following fault codes, please see Tech Tip 01-19-06 (2056714/1) for info on N80 Purge Valve testing
  • P0441, P0442, P0455, P0456
    • https://static.nhtsa.gov/odi/tsbs/2019/MC-10166734-0001.pdf NHTSA