Parts for your 2022 Toyota Prius-Sump plug washers

2022 Toyota Prius sump-plug-washers: what they do and when to replace them

Based on Toyota’s own technical material, the 2022 Toyota Prius does use a sump-plug-washer on the engine oil drain plug. The Toyota Repair Manual for the ZVW50-series Prius (2016–2022) specifies fitting a new aluminium crush-type gasket whenever the engine oil is drained and the plug is refitted, and gives a tightening torque of around 27 N·m for the drain plug. Toyota’s Electronic Parts Catalogue also lists a replaceable 12 mm drain plug gasket (commonly referenced as Toyota Genuine part number 90430-12031) for the 2ZR-FXE engine used in the 2022 Prius. Those sources confirm the washer is relevant and fitted.

For this Prius, the sump-plug-washer is a small single-use aluminium gasket that sits under the oil drain plug. When the plug is tightened to spec, the washer “crushes” slightly to create a reliable seal between the plug head and the sump. That crush action prevents weeping and drip leaks, helps keep the sump threads happy, and makes future services easier. It’s a tiny bit of kit that saves a lot of mess under the bonnet and on the driveway.

Because it’s designed to deform only once, the sump-plug-washer should be replaced at every engine oil change. On a 2022 Prius in Australia or New Zealand, that’s typically every 10,000 km or 12 months, whichever comes first, or sooner if the car does lots of short trips. Reusing a flattened washer can lead to small but annoying leaks, and over-tightening to compensate can risk damaging the sump threads.

Techs servicing a Prius should:

• Install a new genuine-spec 12 mm aluminium washer each time the drain plug is refitted.
• Tighten the plug to the Toyota-stated torque (about 27 N·m) rather than “by feel”.
• Wipe and inspect for seepage after a warm-up drive, hybrids can hide slow leaks because the engine cycles on and off.
• Check the engine under-cover for any oil misting or fresh spots at the next visit—undertrays can catch early drips.

If there’s oil around the plug, a fuel-like smell after drives, or spots on the garage floor, it’s worth replacing the washer and confirming torque straight away. Keeping a small pack of correct-size washers on hand makes DIY servicing smoother, and sticking with the Toyota-listed part ensures the crush and sealing are spot on for the Prius sump design.

Does the 2022 Toyota Prius use a sump-plug-washer?

Yes. Toyota specifies a replaceable aluminium crush washer for the engine oil drain plug on the 2ZR-FXE engine. It’s intended to be changed at every oil service to maintain a proper seal.

What size sump-plug-washer does the 2022 Prius need?

It uses a 12 mm aluminium crush washer as listed in Toyota’s parts catalogue (often referenced as 90430-12031). Sticking with a genuine-equivalent size and material ensures the correct crush and seal.

How tight should the drain plug be on a 2022 Prius?

Toyota’s repair manual calls for about 27 N·m. Using a torque wrench avoids over-tightening, protects the sump threads, and lets the washer do its sealing job properly.