P0440 Subaru Forester
EVAP System Malfunction · Powertrain Code · Low · Repair: Easy
What is P0440?
General EVAP (evaporative emission control) system malfunction. The system that prevents fuel vapors from escaping has detected a fault.
When the Subaru Forester triggers code P0440 (evap system malfunction), 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 Subaru Forester.
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 Subaru Forester.
Common Causes on Subaru Forester
- Loose or damaged fuel cap
- Cracked EVAP canister
- Failed purge control solenoid valve
- Leaking EVAP hose or connector
Symptoms
- Check Engine Light on
- Fuel odor near vehicle
- No driveability symptoms
Notes for Subaru Forester
Subaru fuel caps are model-specific; always use the correct OE cap to ensure proper sealing.