Parts for your 2012 Honda Odyssey-Sump plug washers

2012 Honda Odyssey sump plug washers

Technical sources confirm the 2012 Honda Odyssey does use a sump plug washer. Honda’s 2011–2013 Odyssey Service Manual (Engine Lubrication) specifies a single‑use aluminium crush washer on the engine oil drain plug, replaced at each oil change and tightened to 39 N·m (29 lbf·ft). Honda’s genuine parts catalogue lists the Washer, Drain (14 mm) as p/n 94109‑14000 for this model.

A sump plug washer on the 2012 Odyssey isn’t just a nicety, it’s the small, crushable gasket that keeps engine oil where it belongs. When the plug is tightened, the soft aluminium washer deforms to take up tiny imperfections between the plug flange and the sump face, creating a reliable seal. That’s why Honda calls it single‑use — once crushed, it won’t spring back and seal as intended the next time.

As part of routine servicing, it’s smart to replace the washer every oil change. On this model, the correct size is a 14 mm Honda‑spec aluminium crush washer. The “14 mm” refers to the plug’s shaft diameter, not the spanner size on the head. Reusing an old washer can lead to slow weeps, an oily underbody, and the hassle of having to top up between services.

Good workshop practice for the Odyssey goes like this:

• Use a new 14 mm aluminium crush washer (Honda p/n 94109‑14000 or an equivalent quality aftermarket part).
• Clean the sump sealing face and the plug’s flange so the new washer sits flat.
• Start the plug by hand to avoid cross‑threading, then torque to 39 N·m (29 lbf·ft) — no need to over‑muscle it.
• Never double‑stack washers, and don’t reuse the old one.
• After the refill and start‑up, check underneath for any sign of seepage.

Aluminium is preferred for the Odyssey because it crushes consistently at the specified torque. Copper washers exist, but they crush differently and can tempt overtightening if you’re chasing a seal by feel. Keeping a small stash of genuine or quality equivalent washers in the glovebox or garage makes servicing straightforward. If the plug head is burred or the threads look suspect, consider replacing the plug itself to protect the alloy sump. Done right, a fresh washer each service is cheap insurance against leaks and the potential for a messy driveway — or worse, gradual oil loss on a long Kiwi or Aussie road trip.

Popular questions

What size sump plug washer does a 2012 Honda Odyssey use?
The 2012 Odyssey uses a 14 mm aluminium crush washer, commonly listed by Honda as p/n 94109‑14000. The 14 mm refers to the drain plug’s shank diameter, not the hex size on the head. Stick with Honda‑spec aluminium for the right crush and seal.

How often should the sump plug washer be replaced?
Replace it at every engine oil change. The washer is designed to deform once to make the seal, reusing it increases the risk of seepage. Honda service information for the 2012 Odyssey explicitly notes replacing the drain plug washer at each service.

What’s the torque spec for the 2012 Odyssey sump plug?
39 N·m (29 lbf·ft). Using a torque wrench helps the washer crush correctly without stressing the sump threads. If you don’t have one, aim for firm, controlled tightening — but investing in a torque wrench is the best move.