What size socket for Toyota Yaris spark plugs?
The spark plugs used in most Toyota Yaris models have a 14mm hex head, so you’ll want a 14mm deep-well spark plug socket (often labeled as a 5/8-inch socket in some regions). A 3/8-inch drive is the common setup, and a rubber insert or magnetic holder helps keep the plug secure while you work.
Identifying the right socket for your Yaris
While 14mm is the standard across many Yaris engines (including common variants like 1NR-FE and 1NZ-FE), it’s worth double-checking your specific model and year. If you’re unsure, consult the owner’s manual, check the spark plug packaging, or inspect the plug itself for the hex size. In practice, a 14mm deep-well socket covers most needs, with a 3/8-inch drive being the typical choice for ease of use in the engine bay.
Before you shop for tools, it helps to know the basics of what to look for in a socket set.
- 14mm deep-well spark plug socket: designed to clear the threads and provide full engagement with the plug.
- Drive size: 3/8 inch is the most common choice for passenger cars like the Yaris; some setups use 1/2 inch for heavier torque tools.
- Rubber insert or magnetic drop-in: keeps the spark plug from falling out while you remove or install it.
- Deep reach or extension bar: helpful in tight engine bays to access plugs without removing components.
With the right socket and a little room to maneuver, replacing Yaris spark plugs becomes straightforward. Always ensure you’re using the correct size for your exact engine variant and follow the manufacturer’s torque specifications when reinstalling.
Notes on model and year variations
Most Toyota Yaris engines from recent generations use a 14mm spark plug hex. Some regional tool labeling may list the same size socket as 5/8 inch. If you have a non-standard engine or a specialty variant, verify by checking the engine code (for example, 1NR-FE or 1NZ-FE) and consulting the service documentation for that specific model year.
Summary
For the Toyota Yaris, the typical spark plug socket size is 14mm (deep-well), with a 3/8-inch drive being common. In some markets, it’s labeled as a 5/8-inch socket. Always confirm the exact engine variant if you’re unsure, and use a socket with a rubber insert or a magnetic pickup to hold the plug securely during removal and installation.
