Parts for your 2006 Toyota Vitz|yaris-Sump plug washers

2006 Toyota Vitz/Yaris sump plug washers: what they do and when to replace

Based on Toyota service literature for the XP90-series Vitz/Yaris (2005–2010) and Toyota parts catalogues, the 2006 Toyota Vitz/Yaris oil pan drain plug is designed to be used with a crush-type sump plug washer (oil drain plug gasket). Typical Toyota part numbers seen for this model family include 90430-12031 (aluminium crush washer), fitted to an M12 drain plug, with a manufacturer torque specification around 27 N·m (20 ft·lbf) in the repair manual. These technical sources confirm the sump plug washer is relevant and intended to be used on the 2006 Vitz/Yaris.

On this model, the sump plug washer does the simple but critical job of sealing the oil drain plug to the sump. It’s a soft metal ring—usually aluminium (sometimes copper)—that deforms slightly when tightened. That “crush” fills microscopic gaps between the plug’s flange and the sump face, preventing weeping and drips after an oil change. Without a good washer, owners often see faint oil misting, a slow leak, or a plug that needs overtightening to seal—none of which is ideal for the lightweight alloy sump on a Yaris.

As part of routine servicing, the washer is considered a consumable. Many Toyota procedures and dealer practices treat it as single-use, replacing it at every oil change (typically every 10,000–15,000 km or 6–12 months, depending on local schedule and driving conditions). Reusing one that’s already crushed can work in a pinch, but it ups the risk of seepage and may tempt overtightening, which can damage threads. Given how inexpensive the part is, replacement is the sensible move.

Good servicing habits for a 2006 Vitz/Yaris include:

• Fit a new OEM-spec washer (e.g., 90430-12031) every oil change.
• Clean the sump sealing face and plug flange so the fresh washer beds evenly.
• Tighten the drain plug to the Toyota spec of about 27 N·m (20 ft·lbf)—use a torque wrench rather than guessing.
• Start the engine, check for weeps, and recheck after a short drive.

Owners who notice oily spots under the front of the car, traces of oil around the plug, or a plug that was previously overtightened should plan on a new washer at the next service. For those who prefer aftermarket, choose a washer that matches the OEM dimensions for the M12 plug and is marketed as a crush (not flat) type to maintain the correct seal and torque behaviour.

Popular questions about 2006 Toyota Vitz/Yaris sump plug washers

What size and part number is the sump plug washer on a 2006 Toyota Vitz/Yaris?

The 2006 Vitz/Yaris (XP90) typically uses an M12 oil drain plug with an aluminium crush washer commonly referenced as Toyota part number 90430-12031. Many reputable aftermarket options list compatibility as an M12 crush gasket for Toyota applications of this era.

Dimensions can vary slightly by brand, but if it’s sold as a direct replacement for Toyota M12 drain plugs and specified for the XP90 Yaris/Vitz, it will suit the job. Sticking with OEM or a well-known equivalent keeps the sealing behaviour and torque feel consistent.

How often should the sump plug washer be replaced?

Best practice is to replace the washer at every engine oil change. It’s a crush gasket designed to deform once, reusing it can lead to weeping or the temptation to overtighten the plug.

Given the low cost of the part and the potential mess of a slow leak, most workshops treating the XP90 Yaris/Vitz will fit a new washer as part of standard servicing.

What torque should the drain plug be tightened to, and is sealant needed?

Toyota’s repair documentation for similar M12 plugs specifies about 27 N·m (20 ft·lbf). Using a torque wrench helps avoid stripped threads or a distorted sump face.

No liquid sealant is required or recommended when a correct-spec crush washer is fitted and the mating surfaces are clean. The washer itself is the seal.