ECCPP Ignition Coil & Iridium Spark Plugs Kit — Set of 4 for Mercedes C250/SLK250 1.8L (2012–2015), Direct-Fit

ECCPP UF658 & 93911 kit is a direct-fit set of four ignition coils and iridium-center spark plugs engineered to restore smooth starting and consistent spark for compatible Mercedes-Benz C250 and SLK250 1.8L models (2012–2015).

This plug-and-play replacement bundle contains four UF658 ignition coils paired with four 93911 LKR7AIX iridium spark plugs. Each component is manufactured to meet common original-equipment (OE) specifications so you can swap worn parts quickly without modifying mounting points, wiring, or plug gaps. The coil packs offer a robust silicon steel core and heat-resistant boot, while the iridium plugs use a fine center electrode for stable ignition and extended service life. Before purchasing, verify fitment against your vehicle’s OE numbers or use a fitment tool.

How do these coils and plugs improve everyday driving?

Replacing degraded coils and spark plugs helps eliminate misfires, reduces rough idling, and restores throttle response. This kit is built to provide steady spark energy and consistent combustion that aligns with factory performance expectations.

• Replaces worn components that cause hesitation and poor throttle response.
• Stabilizes idle for smoother low-speed operation.
• Helps maintain factory fuel economy by ensuring complete combustion.

What are the key technical specs I should know?

The ignition coils and spark plugs include measurable specifications for fit and performance so you can confirm compatibility before installation. These values match common OE dimensions for the listed Mercedes applications.

• Coil pack: 12V operation, 3 terminals, bolt-on mount, blade terminal type.
• Spark plug: iridium center electrode, 0.032 in gap, 5/8 in hex, 12 mm thread diameter.
• Replacement numbers: coils correspond to UF658 / C931 / IC761 / A0001502580; plugs correspond to 93911 / LKR7AIX.

How long can I expect these parts to last and what materials are used?

The spark plugs use an iridium center electrode and are specified for long service life when installed and gapped correctly, while the ignition coils are built with heat-resistant materials to withstand under-hood conditions.

• Iridium plug center electrode designed for extended durability and stable spark output.
• Coils feature a silicon steel core, varnished wiring, and high-temperature rubber boots.
• Components designed to match factory emission and ignition performance when replaced as a kit.

Is installation difficult and what should I check before buying?

Installation is generally straightforward for people comfortable with basic engine maintenance; the parts are plug-and-play replacements without extra calibration. Still, always confirm OE numbers and inspect ignition connectors for corrosion or damage before fitting.

• Direct-fit replacements—no special tools required beyond common hand tools.
• No additional programming typically needed when replacing like-for-like coils and plugs.
• Confirm OE numbers and inspect wiring harness and plug wells during service.

Who is this for: This ECCPP kit is intended for owners or mechanics working on 2012–2015 Mercedes-Benz C250 and SLK250 1.8L engines who need a reliable, OE-matching ignition coil and spark plug replacement. It’s suited to drivers experiencing misfires, rough idle, decreased fuel efficiency, or erratic starts, and to anyone performing preventive maintenance to maintain factory engine operation. Verify your vehicle’s part numbers or use a confirmed-fit tool before ordering to ensure proper compatibility.