Parts for your 2011 Toyota Vitz|yaris-Fuel cap

2011 Toyota Vitz/Yaris Fuel Cap — What It Does and How to Look After It

Yes, this model absolutely uses a traditional screw-on fuel cap. Technical sources that document it include the Toyota Owner’s Manual for the 2011 Vitz/Yaris (section on “Fuel tank cap”), the Toyota Electronic Parts Catalogue (EPC, group 77, listing “Fuel Tank Cap” with market-dependent part numbers such as 77310‑52040 and 77310‑0D040), and Toyota’s repair manual procedures for the EVAP (evaporative emissions) system, which rely on a sealed cap to maintain system integrity. There’s no capless filler on the 2011 Vitz/Yaris.

The fuel cap’s job is simple but important. It seals the filler neck so petrol doesn’t evaporate, keeps water and dust out of the tank, and helps the EVAP system hold the right pressure/vacuum so emissions stay low and the car runs sweet. A proper seal also prevents petrol odours in the cabin or garage, protects fuel economy, and reduces the chance of a Check Engine Light triggered by EVAP leak diagnostics.

As part of routine servicing, the cap deserves a quick once-over. Pop it off and check the rubber O‑ring for cracks, flattening, or hardening. Make sure the tether isn’t broken and the cap clicks positively when tightened. Wipe the seal and filler neck lip with a clean, damp cloth to remove grit that can compromise the seal. Don’t lubricate the gasket with petroleum-based products — if needed, a very light wipe with silicone-safe rubber care is fine, but usually a clean, dry gasket is best. Always turn the cap until it clicks, no need to over-tighten.

• Consider replacement if there’s a persistent fuel smell, the cap won’t click, the gasket is perished, the tether’s broken, or you’re getting EVAP-related trouble codes (like P0440/P0442/P0455) after refuelling.
• Use a non-vented cap designed for sealed EVAP systems. Stick with genuine Toyota or a high-quality equivalent matched to your VIN/market to avoid fitment issues.

Swapping the cap is a two-minute job — align, turn until it clicks, and you’re done. If a Check Engine Light appeared due to a loose cap, it may clear on its own after a few drive cycles, otherwise, a scan tool can help. During regular services (or before a long Kiwi road trip or Aussie summer), having the cap checked is cheap insurance for a healthy EVAP system and stink-free motoring.

Popular questions about 2011 Toyota Vitz/Yaris fuel caps

Which fuel cap part number fits a 2011 Vitz/Yaris?
Common Toyota listings include 77310‑52040 and 77310‑0D040, but the exact number varies by market and engine. The safest bet is to match via your VIN or check the stamping on your current cap. A genuine, non-vented cap is recommended for correct EVAP operation.

Why did the Check Engine Light come on after refuelling?
Often it’s a loose or worn fuel cap causing an EVAP leak code. Remove the cap, inspect the O‑ring, then refit and turn until it clicks. If the seal’s damaged, replace the cap. The light may clear after a few trips, if not, scan for codes to confirm it’s EVAP-related.

Is the 2011 Vitz/Yaris fuel cap vented?
No — it’s a non-vented, sealing cap. Tank breathing is handled by the EVAP system and valves, not through the cap. Using a vented aftermarket cap can trigger leaks, smells, and emission faults, so stick with the correct non-vented type.