Parts for your 2009 Toyota Bb-Sump plug washers

2009 Toyota bB sump plug washers — fitted, and worth replacing at every service

Based on Toyota technical material, the 2009 Toyota bB (QNC20/QNC21 series with K3‑VE or 3SZ‑VE engines) uses a crush‑type sump plug washer. The Toyota Electronic Parts Catalogue and the bB Repair Manual specify a drain plug gasket used with the sump plug, typically an aluminium crush washer in the 12 mm class (e.g., common Toyota gasket families such as 90430‑12031 or equivalent). These sources confirm the washer is relevant and fitted from factory to seal the oil drain plug properly.

On this model, the sump plug washer’s job is simple but critical: it deforms slightly when the plug is torqued, creating a reliable seal between the plug flange and the sump face. That prevents weeping and drips, helps maintain correct torque without overtightening, and protects the softer alloy sump face from damage. Reusing a crush washer can leave it work‑hardened and uneven, which is why Toyota service information recommends fitting a new gasket at each oil change.

For day‑to‑day servicing of a 2009 bB, the easy habit is: new oil, new filter, new washer. It’s a low‑cost part that avoids messy leaks and comebacks. Typical drain plug torque for these small Toyota/Daihatsu engines sits around the low‑30s N·m, always follow the exact value in the repair manual for the specific engine code. Don’t reef on the spanner — let the new washer do the sealing.

• Replace the sump plug washer at every oil change (usually 10,000–15,000 km or 6–12 months in AU/NZ conditions, per service schedule and use).
• Signs a washer’s due: fresh oil mist around the plug, a plug that needs “just a bit more” to seal, or a visibly grooved/crushed gasket.
• Stick with quality aluminium or copper crush types sized for the factory plug, avoid fibre or universal washers that don’t crush evenly.
• Service tip: clean the sump face and plug flange, hand‑start the plug, fit a single new washer (never double‑stack), and torque to spec.

Keeping a small pack of genuine‑spec washers on the shelf makes DIY servicing the bB tidy, quick, and leak‑free.

Popular questions about 2009 Toyota bB sump plug washers

What size washer does a 2009 Toyota bB use?
The bB commonly uses a 12 mm ID crush washer with its factory drain plug, often supplied as an aluminium Toyota gasket (many catalogues list families like 90430‑12031). Because trims and regional specs can vary, the safest bet is to match by VIN or measure the plug shank to confirm 12 mm.

Can the old sump plug washer be reused?
Not recommended. It’s a single‑use crush washer. Once compressed, it won’t seal the same way again and may need extra torque to stop a seep, risking thread damage to the sump. Fit a fresh washer every oil change.

What torque should the drain plug be tightened to?
For the bB’s small petrol engines, the drain plug is typically torqued around the low‑30s N·m. Always check the exact figure in the repair manual for the engine fitted (K3‑VE or 3SZ‑VE). Over‑tightening is a common cause of stripped threads and leaks.