P0442 Mazda Cx-5
EVAP System Leak Detected (Small Leak) · Powertrain Code · Low · Repair: Easy
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 Mazda Cx-5 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 Mazda Cx-5.
This repair is rated easy, meaning basic tools, no lift needed.
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 Mazda Cx-5.
Common Causes on Mazda Cx-5
- Gas cap not sealing due to worn gasket
- EVAP purge solenoid valve slow leak
- EVAP vapor line crack near fuel tank
- Charcoal canister vent valve not closing fully
- Fuel filler neck gasket 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 Mazda Cx-5
CX-5, CX-50, Mazda3, and CX-30 EVAP systems are reliable. P0442 is most commonly caused by a worn gas cap on Skyactiv platforms.