{"product_id":"ignition-coil-iridium-spark-plugs-for-mercedes-benz-m-class-2012-2015-4-7l-5-5l","title":"Ignition Coil + Iridium Spark Plugs for Mercedes Benz M-Class (2012-2015) 4.7L 5.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit OEM-Spec Ignition Coil \u0026amp; Iridium Spark Plug Kit for 2012-2015 Mercedes Benz M-Class 4.7L, 5.5L (W166 \/ M278, M157)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil + Iridium Spark Plug Kit replaces worn factory ignition components on the 2012-2015 Mercedes Benz M-Class to eliminate high-boost misfires and restore combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz M-Class Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eUnder the high cylinder pressures of the twin-turbocharged \u003cstrong\u003eM278\u003c\/strong\u003e and \u003cstrong\u003eM157\u003c\/strong\u003e engines, factory ignition systems experience severe thermal cycling. The enclosed packaging of the \u003cstrong\u003eW166\u003c\/strong\u003e engine bay leads to chronic heat soak, breaking down the internal epoxy insulation and primary\/secondary windings of factory coils. Over time, this degradation causes internal micro-arcing and spark blowout under load. Simultaneously, standard plug electrodes suffer gap erosion from sustained high combustion temperatures, widening the gap and forcing the coil to operate at maximum dielectric stress, ultimately triggering P0300-series multi-cylinder misfire fault codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis refresh package delivers eight direct-fit coil-on-plug units engineered to meet or exceed OEM dielectric resilience alongside matched Bosch fine-wire double-iridium spark plugs. Designed to replace OE part numbers \u003cstrong\u003eA2769063700\u003c\/strong\u003e and \u003cstrong\u003e2769060501\u003c\/strong\u003e, the ignition coils feature heat-resistant thermoplastic housings and premium magnetic core laminations that provide consistent secondary voltage under peak boost. Paired with laser-welded iridium center electrodes, this kit reduces voltage demand, stabilizes idle quality, resists fouling, and delivers rapid spark discharge for complete flame front propagation across the entire RPM band.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2012-2015 Mercedes Benz M-Class\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eM278 (4.7L), M157 (5.5L) \/ W166\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e402-550 hp \/ 443-560 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eUF741, A2769063700, 2769063700, 2769060501, 0040103070, ZR6SII3320\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2012-2014 Mercedes Benz M-Class ML550 4.7L V8 Biturbo (M278)\u003c\/li\u003e\n  \u003cli\u003e2012-2015 Mercedes Benz M-Class ML63 AMG 5.5L V8 Biturbo (M157)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the W166 M-Class?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2012-2015 Mercedes Benz M-Class equipped with the M278 or M157 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these spark plugs require pre-gapping before installation?\u003c\/strong\u003e\u003cbr\u003e No, these double-iridium plugs are factory pre-gapped for direct-injection biturbo V8 applications and should be torqued to OEM specifications without altering the delicate fine-wire gap.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-output European biturbo powertrains, these ignition components ensure exact electrical continuity, zero check-engine lights, and clean high-RPM combustion execution under demanding load profiles.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625862238456,"sku":"DS-E7B61AGPA","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-m-class-2012-2015-4-7l-5-5l-1.jpg?v=1790352530","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-m-class-2012-2015-4-7l-5-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}