Ignition Coil + Spark Plugs for Audi S5 (2018-2021) 2.9L

Direct-Fit Ignition Coil and Spark Plug Kit for 2018-2021 Audi S5

What it Does: The complete ignition kit replaces worn factory secondary ignition hardware on the 2018-2021 Audi S5 to eliminate cylinder misfires, restore clean flame kernel propagation, and stabilize high-rpm spark delivery.

The Stock Audi S5 Ignition Breakdown

Factory ignition coils on the B9 chassis endure intense thermal saturation inside the compact cylinder head valley of the EA839 engine. Over extended heat cycles, the internal copper windings and dielectric epoxy degrade, causing secondary current leakage and high-boost spark blowout. Simultaneously, factory spark plugs suffer ground electrode wear and ceramic insulator micro-fractures, which widens the plug gap, strains the coil drivers, and triggers diagnostic trouble codes like P0300 through P0306 under peak load.

The Engineering Solution

This replacement kit includes six direct-fit coil-on-plug assemblies and six matched spark plugs engineered to withstand aggressive thermal profiles. The ignition coils utilize high-grade magnetic silicon steel cores and reinforced thermoplastic housings to resist dielectric breakdown and maintain secondary voltage stability across the rev band. Paired with fine-wire center electrode spark plugs, the kit reduces the required ionization voltage, optimizes quench resistance, and ensures complete combustion without modification to the factory wiring harness.

Technical Specifications

Compatibility

• 2018 Audi S5 2.9L V6
• 2019 Audi S5 2.9L V6
• 2020 Audi S5 2.9L V6
• 2021 Audi S5 2.9L V6

Frequently Asked Questions

Does this fit the B9 S5?
Yes, this is a direct fit for the 2018-2021 Audi S5 equipped with the EA839 2.9L engine.

Should spark plug gap clearance be verified prior to installation?
Yes, verify gap clearance with a feeler gauge to factory service manual tolerances prior to torquing to prevent electrode binding.

The Audi Precision Caliber

Engineered to meet stringent European performance tolerances, this ignition system upgrade maintains precise ECU timing control, ensures smooth idle stability, and guarantees a zero-CEL running condition under demanding driving conditions.