{"product_id":"ignition-coil-and-iridium-spark-plugs-for-audi-a8-2003-2006-4-2l","title":"Ignition Coil and Iridium Spark Plugs for Audi A8 (2003-2006) 4.2L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2003-2006 Audi A8\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit restores factory spark energy and cylinder combustion efficiency on the 2003-2006 Audi A8 4.2L V8, resolving misfire codes and rough idle conditions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Audi A8 Secondary Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eIn the \u003cstrong\u003eD3\u003c\/strong\u003e generation Audi A8, intense thermal saturation inside the 40-valve cylinder head leads to premature failure of factory pencil coils. The \u003cstrong\u003eBFM\u003c\/strong\u003e 4.2L V8 engine utilizes tight cylinder packaging where sustained operating temperatures degrade internal coil windings and cause micro-fractures in the silicone insulation boots. Over time, dielectric breakdown permits secondary spark energy to arc directly to the cylinder head rather than across the spark plug electrode. Concurrently, factory plugs suffer electrode erosion and gap widening, increasing secondary resistance and forcing aging coils beyond their operating limits. This results in P0300-P0308 misfire codes, hesitations under throttle load, and unburned fuel saturating catalytic converters.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition tune-up kit replaces failing components with eight high-dielectric pencil ignition coils engineered to match OEM \u003cstrong\u003e077905115P\u003c\/strong\u003e and interchange \u003cstrong\u003eUF418\u003c\/strong\u003e specifications. Manufactured with high-temperature epoxy potting and reinforced silicone boots, each coil-on-plug unit resists heat soak and prevents high-voltage flashover. Paired with fine-wire iridium spark plugs, the system requires lower primary firing voltage to initiate a stable, concentrated flame front. The laser-welded iridium core demonstrates superior anti-erosion properties under sustained heat, stabilizing cylinder idle dynamics, restoring responsive throttle tip-in, and preserving factory fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e2003-2006 Audi A8\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;\"\u003e4.2L V8 (BFM) \/ D3\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;\"\u003e335 hp \/ 317 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;\"\u003e077905115P, UF418, 077905115Q, 077905115T, 077907115K, 77905115T, 077905115C, 077905115E, 077905115F, 077905115H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003 Audi A8 Base 4.2L V8 (D3)\u003c\/li\u003e\n  \u003cli\u003e2004 Audi A8 Base \u0026amp; L 4.2L V8 (D3)\u003c\/li\u003e\n  \u003cli\u003e2005 Audi A8 Base \u0026amp; L 4.2L V8 (D3)\u003c\/li\u003e\n  \u003cli\u003e2006 Audi A8 Base \u0026amp; L 4.2L V8 (D3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the D3 A8?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2003-2006 Audi A8 equipped with the BFM 4.2L V8 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre these spark plugs pre-gapped for the 4.2L V8?\u003c\/strong\u003e\u003cbr\u003e Yes, all included iridium spark plugs arrive pre-gapped to factory specifications for straightforward drop-in installation without risking fragile center electrode damage.\u003c\/p\u003e\n\n\u003ch3\u003eThe Audi Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet stringent European electrical thresholds, this complete ignition set delivers precise primary-to-secondary resistance to maintain full compatibility with Bosch Motronic ECU diagnostics, ensuring zero check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50594178007288,"sku":"DS-E17Y3ZKBH","price":140.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-audi-a8-2003-2006-4-2l-1.jpg?v=1790057778","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-audi-a8-2003-2006-4-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}