Kooks Headers O2 Sensor Extension Harnesses

Kooks Headers O2 Sensor Extension Harnesses are purpose-built accessories engineered to complete a proper header installation when factory oxygen sensor wiring falls short of its new sensor location. These harnesses are the correct, no-compromise solution for restoring full oxygen sensor functionality after upgrading to performance headers — ensuring your vehicle's ECU continues to receive accurate air-fuel data without fault codes or check engine lights.

Included with Kooks Header Kits — Also Available as Replacements

These extension harnesses are included with applicable Kooks header kits where needed. They are also available individually as direct replacements for harnesses originally supplied in a Kooks kit that have since been damaged or lost. Each harness features OEM-matched connectors for true plug-and-play installation — no cutting, splicing, or modification required.

Key Features:

• OEM-matched connectors for seamless plug-and-play installation with factory oxygen sensors
• High-temperature resistant wiring built for the demanding thermal environment of performance exhaust systems
• Maintains accurate O2 sensor signal transmission to the vehicle's ECU for proper air-fuel management
• Prevents check engine lights and fault codes caused by stretched, misrouted, or damaged O2 sensor wiring
• Designed and supplied by Kooks to pair directly with their header and exhaust systems
• Available in multiple configurations to suit a wide range of platforms and connector types

Backed by over 60 years of American craftsmanship, Kooks Headers and Exhaust has been a leader in the high-performance exhaust industry since 1962. With championships across NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA, and more, every Kooks product reflects the same race-proven engineering that defines the brand. All Kooks products are proudly handcrafted in the USA by an independently owned, three-generation family company.