Keep high-voltage spark energy on its intended path with the ThunderCore PRO Coil Boot 900-P2025, an OE-replacement coil-on-plug boot for the 1997-1999 Audi A8 (V8-3.7L) and 1997-1999 Audi A8 Quattro (V8-4.2L). In coil-on-plug (COP) and coil-near-plug (CNP) systems, the boot forms the insulative path between the ignition coil and the spark plug, keeping high-voltage current where it belongs.
- OE-replacement quality: designed to match OE dielectric strength, boot length, and connector geometry.
- Heat & chemical resistant: rubber construction made to resist oil, fuel, and under-hood heat.
- Restores spark insulation: replaces worn or cracked boots for proper spark isolation and secure coil-to-plug contact.
Over time, coil boots can degrade from heat, vibration, and chemical exposure, which can lead to arc-through, misfires, or hard starting. If a cracked or worn boot is the cause of those symptoms, this part replaces it and restores the insulation between the coil and plug — diagnose the underlying cause before replacing. The listed V8-3.7L and V8-4.2L applications use eight boots per engine (Quantity Per Application: 8); this listing is for a single black boot, so order the quantity your engine requires. Country of origin: China.
Manufacturer part number 900-P2025 (also 900P2025).
This part cross-references / interchanges with the following part numbers:
671-8165, CH-110, 36-2042, SPP57E
