Parts for your 2013 Toyota Bb-Sump plug washers

2013 Toyota bB sump plug washers — what they do and when to replace

Based on Toyota technical sources, the 2013 Toyota bB does use a sump plug washer. The Toyota Electronic Parts Catalog for the bB (QNC20/QNC21 with 1NZ‑FE or 2SZ‑FE engines) lists a replaceable aluminium drain plug gasket (sump plug washer) under part number 90430‑12031. Toyota service information further notes the drain plug gasket should be replaced whenever the plug is removed during an engine oil change. So yes — a sump plug washer is fitted and is part of normal servicing on a 2013 Toyota bB.

On the bB, the sump plug washer is a small, single‑use crush gasket that sits between the drain plug head and the sump. When the plug is tightened to the factory spec, the aluminium washer deforms slightly to create a reliable seal. That crush action does two important jobs: it prevents weeping and drips, and it spreads clamping load so the sump threads aren’t over‑stressed. It’s a simple, inexpensive part that protects a much more expensive alloy sump.

For servicing a 2013 Toyota bB, the smart move is to replace the sump plug washer at every oil change. Re‑using an old washer can lead to seeps that leave spots on the driveway, or it can tempt over‑tightening to “make it seal”, risking stripped threads. Stick with the correct 12 mm genuine‑spec aluminium washer (Toyota 90430‑12031 or equivalent). Avoid sealants, the washer is designed to do the sealing on its own.

Good practice looks like this:

• After draining the oil, clean the plug and the sump’s sealing face.
• Fit a new aluminium washer and refit the plug by hand first to avoid cross‑threading.
• Tighten to the factory torque using a torque wrench. Don’t “nip it up” by feel.
• After the first drive, have a quick look under the car to confirm it’s dry.

If the plug head is rounded, the magnet is loose, or the sealing face is nicked, replace the plug as well. A fresh washer and correctly torqued plug help keep the bB’s 1NZ‑FE/2SZ‑FE engines clean, leak‑free, and easy to live with over big kilometres — very kiwi and Aussie sensible.

• Does the 2013 Toyota bB need a new sump plug washer at every service?
  Yes. Toyota’s service guidance calls for replacing the drain plug gasket whenever it’s removed. It’s a cheap part that prevents leaks and protects the sump. Replacing it at each oil change is best practice.
• What size sump plug washer does the 2013 bB use?
  The bB with 1NZ‑FE or 2SZ‑FE engines uses a 12 mm aluminium crush washer, commonly referenced as Toyota part number 90430‑12031. Always match by VIN or parts catalogue to be sure.
• Can the old washer be re‑used if it looks OK?
  Not recommended. The aluminium is designed to crush once. Re‑using can cause weeping or require extra tightening, which risks damaging the sump threads. Fit a new washer each time.