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Prices may varyThis product ranks #12 of 28 in Spark Plug.Three above it ↓
Last reviewed June 30, 2026
TL;DR Motorcraft is Ford's OEM parts brand; the SP-546 is the factory one-piece iridium replacement for the 5.4L 3V Triton V8 in the 12th-gen F-150 (2009-2010). One-piece design eliminates the spark plug breakage issue that affected earlier two-piece 3V plugs. Verify black coil boots before ordering.
The SP-546 (CYFS-12Y-T1) is Motorcraft's one-piece iridium replacement for the 5.4L 3V Triton V8 in the 2009-2010 F-150 and earlier generations. The critical feature is its one-piece construction: earlier 5.4L 3V plugs used a two-piece design that frequently seized in the aluminum cylinder head and broke at the electrode during removal, leaving the electrode body behind. SP-546 eliminates that failure point. Amazon's listing shows "Core Material: Copper" -- a documented catalog error; the tip is iridium per OEM designation. Apply to engines with BLACK factory coil boots only.
Right pick for 2009-2010 F-150 owners with the 5.4L 3V Triton V8 and BLACK factory coil boots at the OEM service interval. Also covers earlier F-150 (2004-2008), Expedition, and Navigator 5.4L 3V with black boots. Skip if your coil boots are brown (different part applies), if you have the 5.4L 2V engine (use SP-509), the 5.0L Coyote V8 (use SP-548), or the 3.7L V6 (use SP-520). Buy 8 units -- this is a single plug listing.
No chemical exposure pathway: the SP-546 is a passive ignition-system replacement part with no SDS. The iridium electrode tip is a rare precious metal with a higher extraction footprint than platinum, partially offset by the extended service interval. The steel shell is recyclable as ferrous scrap; the alumina-ceramic insulator goes to landfill via standard municipal disposal.
Yes. The SP-546 uses a one-piece design that eliminates the electrode-body separation failure mode common with earlier two-piece 5.4L 3V spark plugs. The original 3V plugs would seize in the aluminum head and snap at the electrode when removed. The SP-546 one-piece construction removes that failure point.
Check your coil boot color. The SP-546 (CYFS-12Y-T1) is for 5.4L 3V Triton engines with BLACK factory coil boots. If your coil boots are brown, a different part number applies. The 5.4L 2-valve engine uses SP-509 (a completely different design). If you have a 5.0L Coyote V8, use SP-548. If you have the 3.7L V6, use SP-520.
The 5.4L 3V V8 has 8 cylinders and requires 8 spark plugs. This listing is sold as a single plug, so you will need to purchase 8 units for a complete engine set.
That is an Amazon catalog data entry error. The SP-546 (CYFS-12Y-T1) is an iridium-tip plug per Motorcraft OEM designation. 'Copper' refers to the copper core inside the center electrode, not the tip material -- a common mis-categorization in Amazon's spark plug database. The tip is iridium.
Yes. The SP-546 applies to the 5.4L 3V Triton V8 across multiple Ford truck and SUV platforms, including the F-150 (2004-2010), Expedition, and Lincoln Navigator with the 5.4L 3V engine and black coil boots. Verify your coil boot color and engine variant before ordering.
Marketing copy from Motorcraft, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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