Parts for your 2020 Toyota Vitz|yaris-Oil cap

2020 Toyota Vitz/Yaris Oil Cap — What it does and how to look after it

Yes, an oil cap is absolutely fitted and relevant on the 2020 Toyota Vitz/Yaris. Toyota’s technical literature confirms it: the Toyota Yaris/Vitz Owner’s Manual (2020) shows the “Engine oil filler cap” in the engine-compartment overview under the bonnet, the Toyota Repair Manual (Engine Mechanical section) covers sealing/inspection of the cap and its gasket, and the Toyota Electronic Parts Catalogue lists the oil filler cap as PNC 12180 (Oil Filler Cap Sub‑Assembly) for common 2020 Yaris/Vitz engines such as M15A‑FKS and 1KR‑FE.

On this model, the oil cap sits on the rocker/valve cover and seals the top of the engine so engine oil stays clean and contained while crankcase ventilation does its job. It’s the access point for topping up oil, and the cap face usually shows the recommended viscosity (often 0W‑16 or 0W‑20 depending on market). Keeping that seal healthy prevents oil mist from weeping out and dust or moisture from sneaking in—both of which can shorten engine life.

There’s no fixed replacement interval for the oil cap, but it deserves a quick check at every service. For Australia and New Zealand, that typically means at each scheduled service visit (time or kilometre-based per Toyota’s local schedule). A tidy, tight cap with a supple rubber seal is all that’s needed. If the cap is loose, cracked, or its O‑ring has gone hard or flattened, it’s time for a replacement.

• Wipe the cap and filler neck clean before refitting—grit is the enemy.
• Inspect the rubber seal/O‑ring for nicks, flattening, or hardening, lightly oil it with fresh engine oil if it’s dry.
• Twist the cap on until it seats positively—no brute force, over-tightening can damage the seal.
• If there’s oil mist around the cap area, check the seal first before chasing bigger problems.

Driving without the cap fitted can cause oil splash under the bonnet, dust ingress, and rough running from upset crankcase ventilation. If a cap goes missing, fit a correct replacement promptly, genuine or quality aftermarket units that meet OE spec will do the trick. For part accuracy, match by VIN or engine code, as regional specs vary.

Popular questions

What oil cap fits a 2020 Toyota Vitz/Yaris?
This model uses an Oil Filler Cap Sub‑Assembly referenced in Toyota’s EPC under PNC 12180, with part variations by engine (e.g., M15A‑FKS, 1KR‑FE) and region. A genuine cap or an aftermarket equivalent that matches the OE sealing face and profile is suitable. The safest bet is to order by VIN to ensure the seal and locking tabs match the vehicle.

Can a loose or missing oil cap cause problems?
Yes. A loose cap can allow oil vapour and mist to escape, attracting dust and grime. If missing, unfiltered air can enter the engine, oil can splash out, and crankcase ventilation can be upset, sometimes causing a rough idle. It’s not wise to drive far without a cap—replace it as soon as practicable.

What oil grade should be on the cap, and what oil should be used?
The cap face typically shows the recommended viscosity for the engine and market—commonly 0W‑16 or 0W‑20 on the 2020 Yaris/Vitz. Always follow the Owner’s Manual guidance for climate and usage in Australia and New Zealand, Toyota Genuine Motor Oil in the specified grade is preferred, with approved alternatives allowed where listed by Toyota.