What size socket for Honda drain plug?
In most Honda engines, the engine oil drain plug head is 17mm, so a 17mm socket is the go-to tool. Some older or smaller Honda engines may use a 14mm hex head, so it’s wise to confirm before you wrench.
Common sizes you’re likely to encounter
To help you prepare for routine oil changes and other drains, here are the sizes you’ll most often see on Honda vehicles. The exact size can vary by engine family and year, so when in doubt check the plug itself or the owner's manual.
- 17mm hex head — the standard for many modern Honda engines (K-series, L-series, etc.).
- 14mm hex head — found on some older or smaller-displacement Hondas.
- Uncommon sizes or nonstandard heads are rare; if you encounter a different size, verify with the manual or a dealership.
For most owners, starting with a 17mm socket will cover the bulk of models produced in the last couple of decades. If the plug head does not fit, stop and verify before forcing a fit, which can strip the bolt.
How to verify the correct size for your specific Honda
Since there’s no universal plug size across all Honda vehicles, a quick check will prevent damage. The steps below outline a practical verification process.
- Torque around the oil pan and locate the drain plug; look at the head for a stamped size (if legible).
- Try a 17mm socket first on the hex head; if it doesn’t seat properly, stop and try a 14mm socket.
- If neither size fits or the head is damaged, consult the owner’s manual or a Honda dealer/service bulletin for the exact specification.
Always use a proper torque specification when reinstalling the drain plug to avoid leaks or stripping threads.
Note on other drain plugs
Other drain plugs on Hondas, such as transmissions or coolant drains, can use different sizes and tools. Do not assume engine oil plug size applies to other components.
Summary
The typical answer to “what size socket for a Honda drain plug?” is 17mm for engine oil in most modern Hondas, with 14mm appearing on some older or smaller engines. Always verify by inspecting the plug or consulting the manual, and use the correct torque to ensure a reliable seal.
