What size socket is a Ford Fiesta spark plug?
The spark plug socket size for most Ford Fiesta engines is 5/8 inch (16 mm). You’ll typically use a deep, six‑point 5/8‑inch spark plug socket with a 3/8‑inch drive ratchet. This size covers the majority of Fiesta configurations, including popular engines like the 1.0 EcoBoost and the 1.6-liter Duratec, but you should still confirm the exact size for your specific engine model in the owner's manual or service guide.
Common spark plug socket size for Ford Fiesta
To help you quickly identify the standard size you’ll need, here is a concise guide to the usual Fiesta setup and how to proceed if you’re unsure.
- 5/8 inch (16 mm) hex spark plug socket, deep-well, 6-point, with a rubber insert; typically used with a 3/8 inch drive ratchet.
In practice, the 5/8 inch size is the norm for most Fiesta engines. If your engine is unusually configured or you’re replacing a different type of plug, verify the size with the service manual or by measuring the plug’s hex directly.
How to verify the correct size for your Fiesta
Because engine configurations and market specifications can vary, it’s wise to double-check before you buy or start the job. The steps below help ensure you use the right tool for your exact car.
When to double-check against the service manual
- Identify your Fiesta’s exact engine code and model year from the VIN plate or owner’s manual.
- Look up the spark plug specification for that engine in the official Ford service manual or a trusted repair guide.
- Inspect the spark plug you are removing to confirm the hex size or compare with a known 5/8 inch gauge.
If there’s any doubt, take the plug to an auto parts store or measure the hex with calipers to ensure you select the correct socket size. Using the wrong size can damage the plug or the tool.
Summary
For most Ford Fiesta models, the standard spark plug socket size is 5/8 inch (16 mm). This is the size you’ll commonly need for removal and installation, typically with a deep, six-point socket and a 3/8 inch drive. Always verify against your specific engine code and consult the service manual to account for any exceptions or market-specific variants.
