P0442 Volkswagen Tiguan
EVAP System Leak Detected (Small Leak) · Powertrain Code · Low · Repair: Moderate
What is P0442?
A small leak has been detected in the EVAP system. Common causes include a loose or cracked gas cap, cracked EVAP hose, or faulty purge/vent valve.
When the Volkswagen Tiguan triggers code P0442 (evap system leak detected (small leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Volkswagen Tiguan.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Volkswagen Tiguan.
Common Causes on Volkswagen Tiguan
- Gas cap not sealing properly
- N80 EVAP purge valve leaking internally
- EVAP vapor line crack near fuel tank
- Fuel tank leak detection pump failure causing false reading
- Charcoal canister activated carbon deterioration
Symptoms
- Check engine light illuminated
- Faint fuel smell near vehicle
- Slightly reduced fuel economy
- Failed emissions test
- Occasional rough idle after refueling
Notes for Volkswagen Tiguan
VW N80 purge valve is a common failure on Jetta, Tiguan, Taos, and Atlas. Located on the intake manifold, it is relatively accessible.