Parts for your 2020 Toyota Vitz|yaris-Sump plug washers

2020 Toyota Vitz/Yaris sump plug washers — what’s fitted and how to look after them

Based on Toyota’s own service literature and parts catalogues, a sump plug washer is absolutely used on the 2020 Toyota Vitz/Yaris. The Toyota Repair Manual for Yaris models (XP130 and XP210 platforms) in the Engine/Hybrid System – Oil and Filter section specifies “install the oil drain plug with a new gasket,” and the Toyota Electronic Parts Catalogue lists the drain plug gasket (commonly Toyota P/N 90430-12031, aluminium crush type, some variants note 90430-12028) for engines fitted to 2020 Vitz/Yaris, including 1NR-FE, 2NR-FKE and M15A-FKS. Toyota service data also calls for replacing the gasket at each oil change.

On this Yaris, the sump plug washer is a small but critical seal that sits between the sump and the drain bolt. It’s a crush (single-use) washer that deforms once to create a reliable, leak-free seal when the plug is torqued down. That’s why Toyota’s workshop procedures say to replace it every time the oil is changed—reusing a crushed washer can cause weeps, drips, or the need to over-tighten the plug.

What’s it do? Simple: it keeps engine oil where it belongs, helps maintain correct clamp load at the specified torque, and protects the alloy sump face from scoring. For most 2020 Vitz/Yaris engines, the drain plug torque is typically around 39–40 N·m, always confirm the exact spec in the vehicle’s manual for the fitted engine.

Good servicing practice for Aussie and Kiwi owners is straightforward:

• Use a new genuine-style aluminium crush washer at every oil change (keep a couple of spares in the glovebox).
• Lightly clean the sump face and plug, fit the new washer, and torque the plug correctly—no cheater bars, no guesswork.
• Don’t add thread tape or sealant, the washer does the sealing.
• After refilling, run the engine, then check for any seepage around the plug and recheck after the first drive.

Signs a washer’s had it include a damp sump, fresh oil spots on the driveway, or needing to nip the plug tighter than spec. If there’s any doubt, replace it—washers are cheap, engines aren’t. For part identification, the Toyota EPC shows the common aluminium gasket (e.g., 90430-12031) across many 2020 Yaris/Vitz variants, but confirm by VIN or engine code to be sure.

This little ring does a big job, treated right, it helps keep the Yaris running sweet, clean and within spec between services.

What size sump plug washer does a 2020 Toyota Vitz/Yaris use?

Most 2020 Vitz/Yaris variants use an M12 aluminium crush washer (Toyota often lists 90430-12031, approx. 12.5 mm ID). The thread on the drain plug is typically M12 x 1.25. Because trims and engines vary by market, the best bet is to match by VIN or confirm the plug size before purchase.

How often should the sump plug washer be replaced on a 2020 Yaris in AU/NZ?

Every engine oil change. That aligns with Toyota workshop procedures and keeps the seal reliable. Follow your logbook interval (typically 12 months/15,000 km for many petrol Yaris models, hybrids and specific markets can vary). If the plug’s been out, fit a new washer—too easy.

What’s the correct torque for the 2020 Yaris sump plug?

Toyota service information for Yaris engines commonly specifies around 39–40 N·m for the drain plug. Use a torque wrench and a fresh crush washer, and always verify the exact spec for your engine code in the service manual.