Ignition and Iridium Spark Plugs for Mercedes-Benz C250 (2012-2015) 1.8L

High-Output Ignition Coils & Iridium Spark Plugs for 2012-2015 Mercedes Benz C-Class

This direct-replacement ignition coil and iridium spark plug kit resolves misfires, restores lost fuel efficiency, and provides a 15% increase in spark energy for the 1.8L turbo engine.

The Stock C-Class Ignition Degradation

The stock ignition coils on the W204 chassis C250 are notoriously prone to premature degradation due to the intense thermal load generated by the M271 1.8L turbocharged engine. Over time, constant heat cycling degrades the internal epoxy potting and factory copper windings within the coil pack. This breakdown increases electrical resistance, leading to secondary voltage leaks. As the spark weakens, technicians typically observe rough idling, hesitation under heavy throttle, and eventual P0300-series misfire codes, which can quickly foul catalytic converters if left unaddressed.

The Engineering Solution

This upgraded ignition package fundamentally redesigns the weak points of the OEM coils by integrating high-density copper wire internals and superior dielectric epoxy insulation to prevent voltage bleed. These materials ensure stable energy transfer even during extreme under-hood heat soak. Paired with the included iridium spark plugs, this kit delivers a 15% increase in spark energy. Iridium’s extremely high melting point allows for a precisely milled fine-wire center electrode, which concentrates the electrical field. This configuration requires less voltage from the coils to bridge the spark gap, reducing the strain on the ignition system while providing a hotter, more consistent burn for optimal combustion and restored throttle response.

Technical Specifications

Compatibility

• 2012 Mercedes-Benz C250 1.8L
• 2013 Mercedes-Benz C250 1.8L
• 2014 Mercedes-Benz C250 1.8L
• 2015 Mercedes-Benz C250 1.8L

The Mercedes Benz Precision Standard

For W204 owners, maintaining factory precision is non-negotiable. This OE+ upgrade is designed to ensure proper resistance values to prevent ECU faults and check engine lights (CEL), delivering a glass-smooth idle and reliable power delivery consistent with strict European engineering standards.

Common Questions

Will this ignition coil and spark plug kit fit my 2012-2015 Mercedes-Benz C250?
Yes, this kit is a direct replacement for all 2012, 2013, 2014, and 2015 Mercedes-Benz C250 models equipped with the 1.8L M271 turbocharged 4-cylinder engine.

Does this kit fit both C250 sedan and coupe models?
Yes, this package is engineered specifically for the 1.8L inline-4 turbo (M271) engine found in both the 2012-2014 W204 sedan and 2012-2015 C204 coupe.

What OEM part numbers does this ignition kit replace?
The ignition coils directly replace OEM and cross-reference part numbers UF658, C931, GN10552, 0001502580, and 0040100072.

Does this require any wiring modifications or tuning to install?
Installation is plug-and-play. The coils and iridium spark plugs match factory dimensions and resistance values so they connect directly to your stock W204 harness without throwing ECU fault codes.

How does this upgrade improve over worn factory M271 coils?
It uses high-density copper windings and upgraded dielectric epoxy insulation to prevent voltage leaks under turbo heat soak, pairing with fine-wire iridium plugs to deliver a 15% increase in spark energy.