What size plugs are in a Toyota Yaris?
The spark plugs in a Toyota Yaris are not a single size; the correct thread size depends on the specific engine installed in your car. In practice, you may encounter 12 mm or 14 mm threaded plugs, among other details, so always verify the exact specification for your engine code and market.
Why the size varies across generations
The Yaris has been offered with several engines across different generations and regions. Each engine family can require a distinct spark plug thread size, reach, and gap. Using the wrong size can lead to improper sealing, misfires, or damage to the cylinder head, so identifying the correct specification from official sources is essential.
How to determine the correct spark plug size for your Yaris
To find the exact spark plug size for your vehicle, follow these steps:
- Identify your engine code and model year. The engine code is usually stamped on the engine block or found in the vehicle’s information sticker or VIN details.
- Consult the owner's manual or a factory service manual for the recommended spark plug specification (thread size, reach, and gap).
- Use Toyota’s official parts catalogs or trusted parts retailers by entering the engine code and market to pull the exact plug specification and part number.
- If you must check on the car itself, you can remove one spark plug to read its thread size (careful with hot components); measure the thread diameter with calipers or a thread gauge, then confirm the pitch and reach from a catalog.
- Verify the correct gap specification for your engine, as this can differ by plug type and engine family.
Always rely on the exact specification for your engine to avoid mis-sizing a plug. If in doubt, contact a Toyota service center or a qualified mechanic with your VIN handy.
Typical thread sizes seen in Toyota Yaris engines
Below are broad patterns you may encounter, but they are not a substitute for the exact engine-specific spec. Always confirm with the official documentation for your car.
- 12 mm thread (M12x1.25) — commonly found on smaller-displacement Yaris engines in various markets.
- 14 mm thread (M14x1.25) — encountered on some larger-displacement Yaris engines in other markets or generations.
In practice, engines vary by region and year, so the exact plug size for your car should be confirmed using the engine code and official Toyota references.
Summary
Key takeaway: There is no universal spark plug size for all Toyota Yaris models. The correct size depends on the engine in your vehicle. Start with the engine code and market-specific documentation, consult Toyota’s official parts catalogs, and verify the plug size, reach, and gap before purchase or installation. If you need precise guidance, a dealership or qualified mechanic can provide the exact specification for your VIN.
