Parts for your 2012 Subaru Xv-Fuel cap

2012 Subaru XV fuel cap — what it does and how to look after it

The 2012 Subaru XV is fitted with a conventional screw-type petrol filler cap. Subaru’s 2012 Impreza/XV Owner’s Manual instructs drivers to “tighten the fuel filler cap until it clicks,” and Subaru service information notes the EVAP emissions system will flag a loose or faulty cap with diagnostic codes (often P0456/P0457). That makes the fuel cap a relevant, serviceable part on this model.

On this XV, the fuel cap’s job is simple but critical. It seals the tank to keep petrol vapour in and dust, water and grime out. That airtight seal lets the EVAP system do its job, keeps the car compliant with emissions standards, and helps avoid that annoying Check Engine light after a fill-up. It also stops petrol smells sneaking into the cabin or garage. The cap uses a rubber sealing ring and a click-to-tighten mechanism, the attached tether stops it going walkabout at the servo.

As part of routine servicing, it’s worth giving the cap a quick once-over. Wipe the sealing surface on the cap and the filler neck with a clean, dry cloth. Don’t grease the seal or neck—lubricants can damage the rubber and upset the EVAP system. Refit the cap until it clicks several times. If the tether is frayed, the seal looks cracked or flattened, or you can smell fuel around the left rear quarter, it’s time to sort a replacement.

• Common signs the cap needs replacing:
  • Fuel odour near the rear of the car
  • Cap won’t “click” or feels loose
  • Check Engine light after refuelling (EVAP small/large leak codes)
  • Perished, cracked or missing rubber seal

When replacing, choose a genuine Subaru cap or a quality equivalent that’s specified for the 2012 XV/Impreza platform so the pressure-vacuum valve and seal match factory specs. Fitting is as easy as unscrewing the old cap, checking the filler neck is clean, and installing the new one until it clicks. If a Check Engine light popped up from a loose cap, tighten it properly and drive a few trips, the light often clears after the system self-checks. If it lingers, get the codes scanned.

Handy tip: always stop fuelling at the first click of the pump. Overfilling can flood the EVAP system and mimic a “bad cap” fault.

Popular questions about 2012 Subaru XV fuel caps

What type of fuel cap does the 2012 Subaru XV use?

It uses a screw-on, click-to-tighten cap with a tether behind the fuel door—there’s no capless system on this model. Use a cap specified for the 2012 XV/Impreza so the EVAP seal and valve are correct.

Why did the Check Engine light come on after I refuelled?

Most of the time, the cap wasn’t tightened enough. Remove and refit it until it clicks several times, then drive a few short trips. If the light stays on, there may be an EVAP leak (often logged as P0456 or P0457) and the cap seal could be worn.

How often should I replace the fuel cap?

There’s no fixed interval. Inspect it at each service and replace if the seal is perished, the cap won’t click, the tether is broken, or EVAP leak codes keep returning despite proper fitment.