BBK 1121 O2 Sensor Wire Extension Harness for 2018-2024 Ford Mustang All Trims

Vehicle Fitment

• 2018-2024 Ford Mustang (EcoBoost, EcoBoost Premium, GT, GT Premium, Mach 1, Dark Horse, Dark Horse Premium)
• 2018-2020 Ford Mustang (Shelby GT350, Shelby GT350R)
• 2020-2022 Ford Mustang (Shelby GT500)

Fitment Notes

• Required when installing long tube headers or mid-pipes that relocate O2 sensors and exceed factory harness reach.
• O2 sensors themselves are not included with this extension harness kit.

Features

• Direct-fit O2 sensor wire extension harness for relocated sensors after exhaust modifications.
• OEM-style connectors ensure secure plug-and-play installation without cutting or splicing wires.
• 16-inch length per harness allows proper reach to front or rear O2 sensor locations.
• Designed to maintain proper oxygen sensor signals to the engine control module (ECM).
• Helps prevent check engine codes related to sensor disconnection after header or mid-pipe installation.
• Compatible with associated performance exhaust header systems that reposition O2 sensors.
• Heat-resistant wiring suitable for under-hood and exhaust-area temperatures.
• Sold as a complete pair for front or rear oxygen sensor extension needs.

Specifications

• Part Number: 1121
• Application: O2 sensor wire extension harness kit
• Length: 16 inches per harness
• Connector Type: OEM-style male and female connectors
• Quantity: Pair (2 harnesses)
• Compatibility: Specific fit for 2018-2024 Ford Mustang variants listed above
• Installation: Plug-and-play, no cutting or splicing required
• Electronics: Designed to preserve factory O2 sensor signal integrity

Included Components

• 2x O2 sensor wire extension harnesses (16" each)

Product Description

The BBK 1121 O2 Sensor Wire Extension Harness Kit is engineered for Ford Mustang enthusiasts who are upgrading to performance exhaust headers or mid-pipe systems that relocate oxygen sensors beyond the reach of the factory wiring harness. Without proper extension, relocating front or rear O2 sensors can cause disconnects and trigger diagnostic trouble codes. This harness set provides the needed 16-inch extension per side to ensure a secure connection without modifying the vehicle's stock wiring.

Each extension harness features OEM-style connectors that snap directly into the factory oxygen sensor harness and the sensor itself, allowing for a true plug-and-play installation. Sold as a pair to cover both left and right sensors, this kit supports a wide range of 2018-2024 Mustang models including EcoBoost, GT, Mach 1, Dark Horse, and Shelby variants. With these extensions in place, your upgraded exhaust system integrates seamlessly with the vehicle's engine control system while retaining proper sensor feedback and drive-by diagnostics functionality.