What size spark plugs are in the Ford Focus 1.0 EcoBoost?
The most common spark plug size for Ford Focus models with the 1.0 EcoBoost engine is an M12 x 1.25 thread with about 19 mm of reach and a gap around 0.8–0.9 mm. Exact specifications can vary by year and engine code, so it’s important to verify against your specific vehicle.
In this article, we break down the typical sizes, explain how to confirm the exact specification for your car, and offer practical guidance for choosing and installing spark plugs on the Focus 1.0 EcoBoost.
Common spark plug size for the Focus 1.0 EcoBoost
The following items summarize the most frequently encountered size and related installation details for typical 1.0 EcoBoost engines found in Ford Focus models from roughly 2012 onward.
- Thread size: M12 x 1.25
- Reach: 19 mm
- Electrode gap (recommended): about 0.8–0.9 mm
- Plug type: iridium or platinum center electrode options are common; OEM and compatible aftermarket plugs (Motorcraft/NGK/Denso) use the same thread and reach
Note that some early or market-specific Focus 1.0 EcoBoost variants may have slight differences in reach or heat range. The exact requirement is listed in the service manual or in Ford’s official parts catalog for your VIN.
How to confirm the exact spark plug size for your car
To ensure you buy the right plugs, follow these steps.
- Check the owner's manual or service manual for the recommended spark plug specification for your engine code and year.
- Inspect the current spark plugs removed from the engine and compare thread size and reach to replacement plugs.
- Use the Ford/Motorcraft or an approved aftermarket catalog by entering your VIN to obtain the exact part numbers and specs.
- When fitting plugs, torque to the manufacturer’s specification and verify the gap if using pre-gapped plugs.
By following these steps, you can confirm the correct spark plug size for your Focus 1.0 EcoBoost and avoid misfits or damage from incorrect plugs.
Additional considerations for replacement and maintenance
Choosing the right plug type and performing proper maintenance helps preserve efficiency and performance in the 1.0 EcoBoost. Always use plugs rated for your engine’s heat range and keep to the recommended replacement interval as outlined in your manual or dealer guidance.
Summary
For most Ford Focus 1.0 EcoBoost models, the standard spark plug size is M12 x 1.25 with a 19 mm reach and a gap around 0.8–0.9 mm. Verify the exact specification for your vehicle using the VIN-based parts catalog or the official service manual, and use OEM or equivalent plugs from trusted brands. Proper sizing and installation are essential for performance, efficiency, and reliability.
