Kooks CAS-105067 Oxygen Sensor Extension Harness Kit for Chrysler/Dodge/Jeep 5.7L, 6.1L & 6.4L HEMI Long Tube Headers

The Kooks CAS-105067 Oxygen Sensor Extension Harness Kit is a critical installation component designed for Gen 3 HEMI long tube header setups, ensuring proper oxygen sensor relocation and seamless integration with aftermarket exhaust systems. Engineered specifically for Chrysler, Dodge, and Jeep platforms equipped with 5.7L, 6.1L, and 6.4L HEMI engines, this extension kit provides the correct harness length and OEM-style connectivity required when upgrading to high-performance Kooks headers.

When installing long tube headers, factory oxygen sensor wiring is often too short to reach the new sensor locations. Without proper extension harnesses, installation becomes difficult, unsafe, or even impossible without modifying factory wiring. The CAS-105067 kit eliminates that issue by providing direct-fit, plug-and-play extensions that maintain factory sensor integrity while allowing for optimal exhaust routing and tuning accuracy.

This kit includes both front and rear oxygen sensor extension harnesses, designed specifically for 4-pin applications commonly found in late-model HEMI platforms. Each harness is built to OEM specifications, ensuring reliable signal transmission and long-term durability under high heat and demanding performance conditions. The materials used are engineered to withstand the extreme temperatures produced by long tube headers, turbo-like exhaust flow increases, and high-performance driving environments.

Ideal for use with Kooks long tube headers, this extension kit is commonly included in full header systems for Dodge Challenger, Charger, Chrysler 300, Jeep Grand Cherokee, Durango, and similar LX/LC platforms. It is also frequently used in retrofit or replacement scenarios where factory extensions are damaged or missing.

By using the CAS-105067 harness kit, installers can maintain proper oxygen sensor placement, which is essential for accurate air/fuel ratio readings and ECU tuning. This ensures your vehicle performs at its full potential after modifications such as headers, mid-pipes, or full exhaust upgrades. Proper sensor positioning also helps prevent check engine lights (CELs) caused by incorrect readings or wiring strain.

This kit is a must-have for enthusiasts building naturally aspirated or forced induction Gen 3 HEMI setups. Whether you’re upgrading a Dodge Challenger Scat Pack, Charger R/T, Jeep Grand Cherokee SRT, or Durango R/T, this harness ensures your exhaust system installation remains clean, reliable, and professional-grade.

For full compatibility and additional performance upgrades, explore our complete Gen 3 HEMI Performance Parts category where you can find headers, exhaust systems, tuning solutions, and supporting modifications designed to work together as a complete system.

Built for precision, reliability, and ease of installation, the Kooks CAS-105067 Oxygen Sensor Extension Harness Kit is the small but essential component that makes big performance upgrades possible.

Specifications & Features
Product Name: Kooks CAS-105067 Oxygen Sensor Extension Harness Kit
Application: Long tube header oxygen sensor extension
Vehicle Compatibility: Chrysler, Dodge, Jeep LX/LC platforms
Engine Compatibility: 5.7L HEMI, 6.1L HEMI, 6.4L HEMI
Years Supported: 2005–2020+ (varies by model platform)
Connector Type: 4-pin OEM-style oxygen sensor connectors
Included Components:
Front O2 sensor extension harnesses (pair)
Rear O2 sensor extension harnesses (pair)
Material: High-temperature automotive-grade wiring and connectors
Function: Extends factory oxygen sensor wiring for header installations
Installation Type: Plug-and-play (no cutting or splicing required)
Heat Resistance: Designed for high-temperature exhaust environments
Use Case: Required for most Kooks long tube header installations
Fitment Notes: Designed for non-AWD LX/LC platform applications
Color: OEM-style black wiring harness
Weight: Lightweight (under 2 lbs approx.)
Manufacturer: Kooks Headers & Exhaust
Country of Manufacture: USA