BBK Mustang GT Front O2 Sensor 18" Long Tube Extension Harness (2018-2021)

$10.00 (14%)
BBK 1121 18" extension harnesses allow you to run full length headers on your 2018-2020 Mustang with fully functioning ODB2 fuel trim correction.
Part Number: 035 1121
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Suggested Mods


BBK's front oxygen extension harness kit is a required add-on when installing BBK 2018+ 5.0L Mustang GT specific Long Tube Headers to maintain the OBD2 fuel trim function and ensure your engine operates at a safe air/fuel ratio. The 18" leads are a direct fit between your sensors and the factory wiring harness with no cutting, splicing or tapping required. 

Note: O2 sensors are NOT included in this kit.

Features & Benefits:

  • Prevents lean engine damage
  • Maintains proper air fuel ratio
  • Plug and play install
  • GT compatible

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: BBK

Vehicle Fitment:

Fits Model Year: 2018, 2019, 2020, 2021
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