P0455 on Subaru Forester: Symptoms, Causes & DIY Fix
Official technical diagnostic wire for fault code P0455 (P0455: Evaporative Emission Control System Leak Detected (Gross Leak)) specifically affecting Subaru Forester vehicles equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
1. Symptoms of P0455 on Subaru Forester
When the Engine Control Module (ECM/PCM) on your Subaru Forester (2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD)) logs fault code P0455, drivers commonly observe:
2. Most Likely Causes on Subaru Forester
Historical warranty claims and technical repair bulletins for Subaru Forester point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Subaru Forester
Remove gas cap, inspect rubber O-ring for cracks, tighten until it clicks 3 times. on the Subaru Forester equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
If the cap rubber is dried or cracked, replace with genuine OEM cap ($15). on the Subaru Forester equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
Disconnect electrical plug and vacuum hose. Apply 12V; verify valve seals tight when unpowered. on the Subaru Forester equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
Check vent valve for road salt corrosion or spider nest clogs. on the Subaru Forester equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
Pump mineral oil smoke into EVAP port to reveal any hairline cracked lines. on the Subaru Forester equipped with 2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD).
4. Subaru Forester P0455 FAQs
What causes code P0455 to trigger on a Subaru Forester?
On the Subaru Forester (2.5L Direct Injection Boxer-4 (182HP / Symmetrical AWD)), P0455 is most frequently caused by Missing, loose, or cracked gas cap seal or Faulty EVAP purge control solenoid. Factory sensor degradation or wiring harness wear near the engine bay are common factors.
Can I safely drive my Subaru Forester with code P0455?
Yes. Completely safe to drive, but emissions test will fail. Given that P0455 carries a Low severity rating on Subaru vehicles, we advise performing diagnostic scanning via the OBD-II port located driver lower dash panel near hood lever before extended highway driving.
Where is the diagnostic port located on the Subaru Forester?
The 16-pin OBD-II DLC connector on the Subaru Forester is situated driver lower dash panel near hood lever. It requires no special tools to plug in a standard scanner.
How much does it cost to fix P0455 on a Subaru Forester?
DIY replacement parts typically range between $15 - $250 (DIY: $15 - $50). If serviced at an authorized Subaru dealership, expect an additional $120–$250 in professional labor based on their $115/hr hourly rate.