Parts for your 2015 Toyota Vitz|yaris-Sump plug washers

2015 Toyota Vitz/Yaris sump plug washers — what’s fitted and what to do about it

Based on Toyota service literature for the XP130-series Yaris/Vitz (model years spanning 2011–2017), this vehicle uses a replaceable sump plug washer (drain plug gasket). Toyota’s Repair Manual procedure for engine oil replacement specifies fitting a new washer at reassembly and tightening the drain plug to the specified torque. Toyota’s Electronic Parts Catalog lists “Gasket, drain plug” p/n 90430-12031 (12 mm aluminium crush type) for the applicable Vitz/Yaris engines of this era (including 1KR-FE and 1NR-FE variants). These technical sources confirm the sump plug washer is used and intended to be replaced during routine servicing.

For the 2015 Toyota Vitz/Yaris, the sump plug washer is a simple, inexpensive crush gasket that does a big job: it seals the drain plug to the alloy sump so engine oil stays put between services. When the plug is tightened to spec (typically around 39–40 N·m depending on engine and market spec), the soft aluminium washer deforms slightly to fill any microscopic gaps. That’s why Toyota calls it out as a replace-after-removal item — once crushed, it won’t spring back the same way twice.

As part of any oil change, it’s smart to replace the washer with a genuine or reputable aftermarket equivalent (commonly 12 mm aluminium, Toyota p/n 90430-12031). Reusing an old washer can lead to weeping around the plug, oil mist underbody, and the odd drip on the driveway. Worse, chasing a leak by overtightening the plug risks damaging threads in the sump — an expensive headache compared to a cheap new gasket.

• Have a fresh washer ready before you pull the plug.
• Clean the mating face on the sump and the plug head.
• Install the new washer and tighten to the correct torque. If a torque wrench isn’t handy, go snug plus a modest nip — never “gorilla-tight”.
• After the engine’s run and settled, check for any seepage around the plug.

Copper and fibre washers exist, but Toyota’s spec for this Vitz/Yaris generation is an aluminium crush washer. If a non-aluminium washer is used in a pinch, replace it with the correct type at the next opportunity. Also keep an eye on the plug itself — if the hex is rounded or the threads look tired, replace the plug along with the washer. Given Aussie and Kiwi conditions (temperature swings, long highway stints, and the odd gravel road), a fresh washer at every service is cheap insurance for a tidy, leak-free sump.

Sources referenced: Toyota Yaris/Vitz (XP130) Repair Manual — Engine Oil Replacement procedure (notes to replace drain plug gasket and apply specified torque), Toyota Electronic Parts Catalog — Gasket, drain plug p/n 90430-12031 applicable to 2015 Vitz/Yaris engines.

Popular questions

What size sump plug washer does a 2015 Toyota Vitz/Yaris use?
For this model and its common engine variants, Toyota specifies a 12 mm aluminium crush washer, typically sold as p/n 90430-12031. It’s designed to deform once and provide a reliable seal. If buying aftermarket, match both the inner diameter (12 mm) and the crush type.

How often should the sump plug washer be replaced?
Every oil change. Toyota’s service procedure calls for replacing the washer whenever the drain plug is removed. It’s a low-cost part that prevents leaks and avoids the temptation to overtighten the plug to stop a weep.

What torque should the drain plug be tightened to?
Toyota’s spec for the XP130 Yaris/Vitz platform is typically around 39–40 N·m, depending on engine variant and market documentation. Use a torque wrench if possible and always confirm the exact value for the specific engine code in local service information.