Ignition Coil Spark Plugs for Ford Ranger (2019-2023) 2.3L

Direct-Fit Ignition Coil & Spark Plug Tune-Up Kit for 2019-2023 Ford Ranger (P558)

What it Does: The ignition coil and iridium spark plug kit refreshes the complete primary ignition system on the 2019-2023 Ford Ranger to eliminate cylinder misfires, restore combustion efficiency, and smooth out idle stability.

The Stock Ford Ranger Ignition Breakdown

Under continuous turbo boost, the factory coil-on-plug (COP) assemblies and plugs in the 2.3L EcoBoost experience rapid thermal cycling and extreme dielectric stress. Over time, internal epoxy insulation breaks down, leading to micro-arcing and internal winding shorts. Concurrently, factory spark plug gaps erode from high combustion chamber pressures, increasing the required firing voltage. This dual degradation triggers common P0300–P0304 misfire trouble codes, hesitation under heavy towing loads, unburnt hydrocarbon buildup, and erratic throttle response.

The Engineering Solution

This full overhaul kit matches OEM primary and secondary winding ratios, using high-dielectric epoxy potting to withstand under-hood heat soak and eliminate secondary voltage leakage. The replacement boots feature high-grade silicone to prevent thermal degradation and valve cover oil intrusion. Paired with fine-wire iridium spark plugs, the kit reduces the required arc voltage, stabilizes flame kernel expansion under high cylinder pressures, and maintains precise gap tolerances significantly longer than standard copper alternatives. Replaces OEM reference UF855 seamlessly.

What's Included

• 4 Black Ignition Coils
• 4 Fine-Wire Iridium Spark Plugs

Technical Specifications

Compatibility

• 2019-2023 Ford Ranger (XL, XLT, Lariat) 2.3L I4 EcoBoost

Frequently Asked Questions & Fitment Warnings

Does this fit the P558 Ranger?

Yes, this is a direct fit for the 2019-2023 Ford Ranger equipped with the 2.3L EcoBoost engine across both manual and automatic drivetrain configurations.

Do I need dielectric grease during installation?

A light coating of dielectric grease inside the spark plug boot prevents voltage tracking and stops the boot from seizing to the plug ceramic during high-temperature engine operation.

The Ford Heavy-Duty Truck Standard

Engineered to handle sustained boost and heavy payload demands, this ignition refresh guarantees reliable spark delivery across every cylinder whether cruising empty or pulling max rated capacity.