BBK O2 Sensor Extension Harness (Front & Rear)

2007–2011 Jeep Wrangler JK 3.8L with Headers

Part #: 1123

Overview

The BBK 24" O2 Sensor Extension Harness is a precision-engineered solution designed specifically for Jeep Wrangler JK models from 2007 to 2011 equipped with the 3.8L engine and BBK long tube headers. When upgrading to BBK Performance long tube exhaust headers, the relocation of oxygen sensors often results in factory wiring that is too short to reach the new sensor positions. This extension harness resolves that issue by providing the necessary length to connect the factory O2 sensor wires seamlessly to the relocated sensors.

Ideal for Jeep enthusiasts who have installed or plan to install BBK headers, this harness ensures a clean, reliable connection without the need for cutting or splicing factory wiring. It maintains the integrity of the vehicle’s electrical system while supporting optimal sensor performance for accurate engine management.

Key Features

Designed to simplify the installation process and maintain factory-level reliability, the BBK O2 Sensor Extension Harness offers the following key features:

• 24-inch length extension for both front and rear O2 sensors
• OEM factory-style connectors for direct plug-and-play compatibility
• Eliminates the need to splice or modify factory wiring harnesses
• Durable wiring and connectors engineered to withstand under-hood conditions
• Specifically designed to fit Jeep Wrangler JK 3.8L models with BBK headers (part numbers 4050/40500)
• Sold in pairs to cover both front and rear sensor connections
• Ensures accurate sensor readings for optimal engine performance and emissions control
• Maintains factory wiring integrity and vehicle reliability

Construction & Design

The BBK O2 Sensor Extension Harness is constructed with high-quality materials to endure the demanding environment of the engine bay. The wiring features heat-resistant insulation and robust connectors that resist corrosion and vibration. The OEM-style connectors guarantee a secure fit and reliable electrical contact, ensuring consistent sensor signal transmission. The harness is engineered to meet or exceed factory specifications, providing a durable and long-lasting solution for your Jeep Wrangler’s exhaust sensor wiring needs.

Installation & Fitment

Installation is straightforward and designed for ease of use. The harness plugs directly into the factory O2 sensor wiring harness and the relocated sensors on the BBK headers and mid-pipe. No cutting, splicing, or additional modifications to the factory wiring are required, preserving the vehicle’s original wiring integrity. This plug-and-play design reduces installation time and potential wiring issues, making it an ideal accessory for anyone upgrading their Jeep Wrangler JK with BBK long tube headers.

This extension harness is specifically engineered for the 2007 through 2011 Jeep Wrangler JK equipped with the 3.8L engine and BBK headers (part numbers 4050 and 40500), ensuring perfect compatibility and fitment.

What's Included

• One pair of 24-inch O2 sensor extension harnesses (front and rear)
• OEM factory-style connectors pre-installed
• Installation instructions (if applicable)

Ideal For

This extension harness is perfect for Jeep Wrangler JK owners who have installed or plan to install BBK Performance long tube headers on their 3.8L engine models. It is especially beneficial for enthusiasts seeking a clean, reliable, and factory-quality wiring solution to accommodate relocated oxygen sensors without compromising vehicle wiring or sensor accuracy.

BBK Performance is a classic American bolt-on performance brand offering airflow and exhaust upgrades for popular domestic platforms. Known for throttle bodies, cold-air intakes, and headers/exhaust components, BBK focuses on straightforward parts that improve throttle response and power—making it a staple for street-driven builds and weekend track cars.