P0442 on a Volkswagen: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

You can drive normally — this is an emissions leak, not an engine failure — but fix it before your next emissions test.

What P0442 means on a Volkswagen

On a Volkswagen, P0442 means the engine computer detected a small leak in the evaporative emission (EVAP) system that captures fuel vapors from the tank. VW's fuel system is closely monitored, so even a small leak in a hose or at the filler neck will set the code. The car keeps running and driving normally.

Is P0442 common on Volkswagens?

P0442 is one of the more frequent EVAP codes on Volkswagens, often traced to a loose gas cap, cracked hoses, or a worn purge valve. The rubber EVAP lines near the engine bay and the fuel filler area are common leak points as they age. It is an emissions issue, not a drivability issue.

Commonly reported on: Golf, Jetta, Passat, Tiguan.

Symptoms

Check engine light on
Possible faint fuel smell
No change in performance

Common causes

most common: Loose, missing, or failing gas cap
common: Cracked or disconnected EVAP hoses
common: Faulty purge valve
less common: Leak at the fuel filler neck or seal

How to fix it

Fix	DIY?	Typical cost
Tighten or replace the gas cap	Yes	$10–30
Replace cracked EVAP hoses	Yes	$20–80
Smoke test the EVAP system to find the leak	Mechanic	$50–150
Replace the purge valve	Yes	$60–150