Ignition Coil + Iridium Spark Plugs for Mercedes Benz S-Class (2011-2017) 4.7L 5.5L

OEM-Spec Ignition Coil and Iridium Spark Plug Kit for 2011-2017 Mercedes Benz S-Class 4.7L, 5.5L (W221/W222 / M278/M157)

What it Does: The Direct-Fit Ignition Coil and Double Iridium Spark Plug Kit replaces degraded factory ignition components on the 2011-2017 Mercedes-Benz S-Class to eliminate high-boost misfires and restore precise combustion timing.

The Stock Mercedes Benz S-Class Ignition Degradation

The twin-turbocharged M278 and M157 engines generate intense thermal loads within the tight confines of the W221 and W222 engine bays. Over time, factory coil potting epoxy hardens and micro-fractures, allowing high-voltage secondary current to arc to the cylinder head under boost. Concurrently, ground electrode erosion widens the spark gap, forcing the coils to work harder to bridge the threshold. This electrical breakdown produces erratic combustion, rough idling, diagnostic trouble codes (P0300–P0308), and limp-mode intervention during wide-open throttle acceleration.

The Engineering Solution

This comprehensive ignition service kit restores factory energy output using reinforced ignition coils paired with OE-matched double iridium spark plugs. Engineered to replace A2769063700, the ignition coils feature high-dielectric epoxy resin and heat-resistant silicone boots to isolate against dielectric breakdown. The companion Bosch ZR6SII3320 spark plugs utilize laser-welded, fine-wire 360-degree continuous iridium center electrodes to minimize ignition voltage demand, stabilize idle quality, and suppress flame blowout under maximum manifold boost pressure.

Technical Specifications

Compatibility

• 2012-2017 Mercedes Benz S-Class S550 4.7L V8 Biturbo (M278)
• 2011-2017 Mercedes Benz S-Class S63 AMG 5.5L V8 Biturbo (M157)

Frequently Asked Questions

Does this fit the W221 and W222 S-Class?
Yes, this is a direct fit for the 2011-2017 Mercedes Benz S-Class equipped with the M278 and M157 engine platforms.

Do these spark plugs require gapping prior to installation?
No, these double iridium spark plugs arrive pre-set to factory clearance; manual adjustment risks fracturing the delicate fine-wire center electrode.

The Mercedes Benz Precision Standard

Maintaining the intricate tolerances of direct-injected Mercedes-Benz Biturbo V8 engines demands OE-level spark continuity to prevent knock-sensor retarding, maintain fuel economy, and guarantee clean, CEL-free engine operation.