Parts for your 2013 Subaru Impreza-Fuel cap

2013 Subaru Impreza fuel cap — purpose, care, and when to replace

Technical sources confirm the 2013 Subaru Impreza uses a conventional, tethered screw-on fuel cap rather than a capless system. The 2013 Subaru Impreza Owner’s Manual (Refuelling/Fuel filler lid and cap section) specifies undoing and refitting the cap until it clicks, and Subaru service information for the Evaporative Emission Control (EVAP) system relies on a sealed cap to maintain system integrity. This is the part that also commonly triggers EVAP-related fault codes if it’s loose or leaking.

On this model, the fuel cap does more than just keep petrol in. It seals the filler neck to stop fumes escaping, keeps water and grit out of the tank, and maintains the slight pressure/vacuum the EVAP system needs to capture vapours and meet emissions standards. A good seal helps avoid petrol smells around the left rear quarter and prevents dirt entering the tank that can shorten fuel pump and injector life. Subaru’s EVAP diagnostics will flag even small leaks, so a cap that doesn’t click tight or has a perished O-ring can light the check engine lamp.

As part of regular servicing, it’s smart to inspect the cap. Make sure it tightens until it clicks several times, the tether is sound, and the rubber seal isn’t cracked, flattened, or shiny-hard. Wipe the cap threads and filler neck with a clean, lint-free cloth if dusty, avoid greases or petroleum jelly on the seal as they can degrade rubber and confuse EVAP test results. If there’s a persistent petrol smell, visible damage, or the vehicle throws small/large EVAP leak codes (commonly P0456/P0457), replace the cap. Genuine or quality OEM-equivalent caps are best, as they’re built to the correct pressure rating for Subaru’s EVAP system—cheap universal caps can cause recurring faults.

There’s no strict replacement interval, but many techs in Australia and New Zealand treat the cap as a wear item: check it at each service and expect to renew it every few years if the seal hardens, especially in hot, dry climates. After refuelling, ensure the cap clicks, if a check engine light appears, re-seat the cap and drive a few trips—the system often clears once it sees a tight seal again.

Does the 2013 Subaru Impreza have a capless filler?

No. According to the 2013 Subaru Impreza Owner’s Manual and Subaru service information, it uses a standard screw-on fuel cap with a tether. A capless setup was not fitted to this model line.

Why does a loose fuel cap trigger a check engine light?

Because the Impreza’s EVAP system pressure-tests for leaks. A cap that isn’t clicked tight—or one with a worn seal—looks like a leak to the system and can set EVAP codes such as P0456 or P0457. Tighten the cap until it clicks and the light may clear after a few drive cycles.

What’s the best replacement fuel cap for a 2013 Impreza?

Use a genuine Subaru cap or a quality OEM-equivalent matched to the vehicle’s EVAP pressure spec. This helps avoid nuisance warning lights and ensures the seal, tether fit, and click mechanism are up to standard for Aussie and Kiwi conditions.