Ford Flex Spark Plug Type
Factory spark plug specifications for the Ford Flex.
Last updated: 2026-10-29 • Reading time: 8 min • By AllOEMManuals Editorial Team
Quick Answer
2019 Ford Flex: CYFS 12 YT4.
| Generation | Years | Top spec |
|---|---|---|
| 2019 | 2019 | CYFS 12 YT4 |
| 2018 | 2018 | CYFS 12 YT3 |
| 2017 | 2017 | CYFS 12 YT3 |
This vehicle's factory manual
The spec is above. This opens the 2019 Ford Flex factory book. Use another year if yours is older.
Ford Flex maintenance schedule
Know the exact spark plug type job for your Ford Flex
2019 Ford Flex: CYFS 12 YT4.
Spark plug type and gap depend on the exact engine. Confirm the engine code before buying plugs or setting the gap. Once the spec is confirmed, use the supplies and purchase links below to build the full one-trip shopping list before you start the repair.
Exact Vehicle Check
The button opens the factory book for this vehicle. Use the engine picker only when your trim is not the one this page already matched.
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You came here for the exact spec. Now here is the exact part — plus the two things people always forget and have to run back to the store for.
Ford Flex Spark Plugs Plugs
Buy the exact plugs with the right heat range and gap. Don't guess on spark plugs.
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Spark Plugs — Manual's Parts List
Exact plugs, exact torque, no stripped threads.
- 1Spark PlugsShop →
CYFS 12 YT4 — buy the full set, not one at a time
- 2Torque Wrench (3/8")Shop →
Aluminum heads strip at 18 ft-lbs — torque, do not guess
- 3Spark Plug SocketShop →
Magnetic or rubber insert — protects the ceramic
- 4Anti-Seize CompoundShop →
A dab on the threads prevents the 100k-mile weld
- 5Dielectric GreaseShop →
On the boot — prevents misfires from moisture
Get everything at once
One search shows all of the above on a single page.
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One-Trip Shopping List
Recommended supplies and tools for this job, grouped so you can buy everything before the repair starts.
Iridium Spark Plugs
Long-lasting performance plugs for modern engines.
Spark Plug Socket
Magnetic or rubber-insert socket to prevent damage.
Gap Gauge
Ensure your plugs are set to the exact factory spec.
Torque Wrench
Crucial for tightening plugs without stripping threads.
Anti-Seize Lubricant
Prevents plugs from welding to the cylinder head.
Dielectric Grease
Protects ignition boots and connectors from moisture.
Project Essentials
Basic tool sets, gloves, and cleaning supplies for your Ford Flex so the job is ready when the parts arrive.
Frequently Asked Questions
- What spark plug type does a Ford Flex use?
- 2019 Ford Flex: CYFS 12 YT4.
- What is the spark plug gap for a Ford Flex?
- 0.81-0.97 mm (0.032-0.038 in) (2019)
- How often to replace spark plugs on a Ford Flex?
- Factory service manuals typically recommend spark plug replacement every 30,000–100,000 miles depending on plug material (copper, platinum, or iridium). Check your maintenance schedule for the exact interval.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29