Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily

Kooks O2 Sensor Extension Harness (11-14 GT500)

Item 399824
AmericanMuscle no longer carries the Kooks O2 Sensor Extension Harness (11-14 GT500). Please check out 2010-2014 Mustang O2 Sensors for an updated selection.

Features & Details

  • Helps Regain Lost Power
  • Extends Front or Rear O2 Sensor Harnesses
  • Reduces Harmful Emissions and Fuel Consumption
  • Durable Stainless Steel Construction
  • Dyno-Tested and Race-Tested
  • An Ideal Fit for Modified Exhaust Systems
  • A Direct OEM Replacement
  • Sold Individually
  • Fits All 2011-2014 Ford Mustang GT500s
Regains Lost Power. A Kooks Oxygen Sensor Extension Harness will help you regain consistent superior performance. This is crucial because a bad oxygen extension harness may result in lousy fuel economy and poor performance and your vehicle may fail the emissions testing. A durable O2 extension harness will replace your worn-out stock harnesses and give you the power that your Mustang needs.

Superior Assembly. The Kooks O2 Sensor Extension Harness ensures a perfect fit for your stock oxygen sensor. It is crafted from premium-quality stainless steel material and unmatched craftsmanship to ensure that it's a high-quality direct replacement for your failed or worn-out OEM oxygen sensor extension harnesses.

Simple Installation. These Kooks O2 Sensor Extension Harnesses feature OEM stock connectors that offer an easy and simple plug-and-play installation. With basic mechanical expertise, you can easily bridge the gap between the long tube headers and your O2 sensors using simple and readily available household tools.

Warranty. The Kooks O2 Sensor Extension Harnesses have a limited lifetime warranty from the manufacturer. This warranty covers against any defects in the manufacturing process and material and structural faults, and it is not transferable.

Application. Designing of the Kooks O2 Sensor Extension Harness ensures that it's a direct replacement for all Ford Mustang GT500 models released between 2011 and 2014. Sold individually.

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Oxygen Sensor Extensions
Installation Info
Tech Specs
Will it fit my Mustang?

    Customer Photos

      Q & A

      No questions about this product yet.

      Ask the First Question

        Customer Reviews (2) Write a Review

        Overall Rating 5

        out of 5 stars

        • 5/5

          July 23, 2019

          O2 Extension

          I used it to extend the passenger 02 sensor on my GT500 to make swapping my mid-pipes out easier. Ford, in their infinite wisdom puts the driver's side O2 sensor in the exhaust manifold and the passenger on the h-pipe with the harness connection ON TOP of the transmission. So far it is a savior of time and patience.


          Year: 2011 Submodel: GT500

          Helpful (0)

        • 5/5

          September 03, 2018

          Excellent product

          Fit and finish is excellent as expected from a Kooks product. Only downfall was it was shipped directly from the manufacturer. It was fast but required a signature, would not accept a signed door tag. After multiple attempts I was able to receive them. Still happy with product, disappointed with manufacture policy.


          Year: 2013 Submodel: GT500

          Helpful (9)

        Related Mustang Categories