Ignition Coil + Spark Plugs for Mercedes Benz CLK-Class (2007-2009) 5.5L

Direct-Fit Ignition Coil and Spark Plug Kit for 2007-2009 Mercedes Benz CLK-Class 5.5L (W209 / M273)

What it Does: The Ignition Coil and Spark Plug Kit restores factory combustion efficiency and stabilizes cylinder pressure on the 2007-2009 Mercedes Benz CLK-Class by delivering consistent, high-voltage secondary discharge directly to each combustion chamber.

The Stock Mercedes Benz CLK-Class Ignition Breakdown

The naturally aspirated 5.5L M273 V8 generates significant thermal load in the compact W209 engine bay. Over operational heat cycles, factory ignition coil potting compounds degrade, while silicone spark plug boots harden and develop micro-fissures. This leads to dielectric breakdown, secondary voltage arcing, and carbon tracking. Paired with aged spark plug electrodes exhibiting increased gap resistance, the ignition system triggers intermittent misfire diagnostic trouble codes (P0300-P0308), sluggish throttle transition, and elevated exhaust gas temperatures.

The Engineering Solution

This comprehensive kit replaces failed electronics with eight direct-mount ignition coils featuring high-conductivity copper windings and heat-resistant epoxy insulation capable of withstanding intense thermal cycling. Paired with matching fine-wire platinum-alloy NGK LKR7BGP spark plugs, the package reduces required arc strike voltage and optimizes flame front propagation. Reinforced silicone boots isolate secondary voltage leakage, ensuring immediate cylinder firing, balanced fuel burn, and restored factory output.

Technical Specifications

Compatibility

• 2007 Mercedes Benz CLK-Class CLK550 5.5L V8 (M273)
• 2008 Mercedes Benz CLK-Class CLK550 5.5L V8 (M273)
• 2009 Mercedes Benz CLK-Class CLK550 5.5L V8 (M273)

Frequently Asked Questions

Does this fit the W209 CLK-Class?
Yes, this is a direct fit for the 2007-2009 Mercedes Benz CLK-Class equipped with the 5.5L M273 engine.

Do these spark plugs require pre-gapping before installation?
No, the included NGK spark plugs are pre-set to factory clearance specs, though verify gaps carefully prior to final installation.

The Mercedes Benz Precision Standard

Engineered to meet stringent European onboard diagnostics parameters, this refresh maintains factory primary circuit resistance to eliminate check engine lights, preserve catalytic converters, and deliver smooth idle stability.