Subaru Fuel Filler Cap 42031FJ000 OEM Replacement — Fits 2012–2024 Models, Restores Seal

The Subaru 42031FJ000 fuel filler cap is the factory replacement gas tank cap designed to restore proper seal and fit for compatible Subaru models from 2012 to 2024.

When a lost, damaged, or worn fuel cap triggers dashboard alerts, fuel smell, or a loose fit, installing the correct OEM cap brings back the secure seal Subaru engineered for your fuel system. This genuine Subaru part is manufactured to the same specifications as the original cap so it integrates with the vehicle's vapor recovery and fuel door assembly without modification.

Which Subaru models use part 42031FJ000?

This cap fits a broad range of Subaru models across several model years, covering compact cars, sedans, crossovers, and performance variants. Always cross-check your VIN or the existing cap part number to confirm compatibility before ordering.

• 2019–2024 Ascent
• 2013–2024 BRZ
• 2013–2024 Crosstrek
• 2014–2024 Forester
• 2012–2024 Impreza 2.0
• 2013–2024 Legacy and 2013–2024 Outback
• 2015–2024 WRX and 2015–2021 WRX STI

How does the genuine Subaru filler cap differ from aftermarket caps?

OEM Subaru caps are produced to match the original tolerances, thread pitch, and sealing surface, which helps maintain proper fuel system pressure and reduces vapor leaks. Aftermarket caps can vary in materials and dimensions, occasionally causing fitment problems or triggering check-engine lights.

• Exact thread and latch geometry to fit Subaru fuel necks
• Material and finish matching factory components
• Designed to work with vehicle evaporative emissions systems
• Backed by Subaru part number verification (42031FJ000 / 42031FJ001 reference)

What should I expect when installing this fuel cap?

Installation is straightforward and requires no special tools — remove the old cap and twist the OEM cap until it clicks to confirm the seal. If you replaced a missing or damaged cap, expect the fuel door to close normally and any fuel-vapor related trouble codes to clear once the system re-learns or the ECU is reset.

• Simple twist-on installation, no tools needed
• Click feedback confirms proper seating
• Resolves loose-cap fuel smells and prevents contaminants
• Helps avoid evaporative emissions system warnings

Will the part number 42031FJ000 work with my existing fuel door and tether?

Yes — the cap is made as a direct replacement for the factory-installed unit and is compatible with the standard fuel door assembly and tether arrangements used on listed Subaru models. If your vehicle originally had a tethered cap, verify whether your replacement requires the tether separately.

• Direct-fit for original fuel door and neck
• Check the vehicle for an attached tether if needed
• Part numbers 42031FJ000 and cross-reference 42031FJ001 may appear in OEM documentation

Who this is for: This genuine Subaru fuel filler cap is ideal for owners and technicians who need a reliable factory replacement for compatibility and fit — especially drivers of 2012–2024 Impreza, Forester, WRX, STI, BRZ, Crosstrek, Ascent, Legacy, and Outback models. Choose this part when you want an exact OEM fit, to restore a secure fuel-system seal, eliminate fuel odors, or address emissions system notices without guessing on aftermarket substitutes.