Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $4,000 in Store Credit! Enter Now >

JMS O2 Sensor Extension Kit; Front Pair (11-14 GT; 12-13 BOSS 302)

Item 399990
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $59.00 You Save 12% ($7.00)
Our Price

$52.00 (kit)

FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    or use

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Extended Front O2 Sensor Harness Kit
      • Ideal for Installation of Modified Exhaust System
      • 12-Inch Length
      • Suits Aftermarket Headers and Cat-Back Exhaust Systems
      • OEM Terminals, Connectors, Wiring, Seals
      • Eliminates Dangerous Splicing
      • Sold As a Pair
      • Plug-and-Play Installation
      • Fits 2011-2014 Ford Mustang GT and BOSS Models


      The Perfect Way to Adapt Aftermarket Exhaust Systems. If you upgrade your 2011–2014 Mustang BOSS or GT with aftermarket headers and a cat-back system, the front oxygen sensors can get moved to a location too far for the original Ford wiring harness to reach. The old messy solution was to splice in extensions but this can result in weak or crossed signals that can impede safe performance or even worse, damage expensive O2 sensors. The JMS O2 Sensor Extension Kit is the perfect solution, giving you an easy plug-and-play set of extensions that maintain Ford OEM standards of components and performance.

      OE Quality Parts. JMS manufactures the O2 Sensor Extension Kit from Ford OEM wiring, seals, connectors and terminators. You get Ford factory quality all the way through, making your aftermarket exhaust installation simply more of a better thing!

      Easy Plug-In Installation. The O2 Sensor Extension Kit from JMS includes two wiring harness extension cables. Simply plug them into the corresponding connectors in the wiring harness and the relocated front oxygen sensors in minutes.

      Application. The JMS O2 Sensor Extension Kit fits all Ford Mustang BOSS and GT models from 2011 to 2014.

      Fitment: 2011 2012 2013 2014 Details

      JMS JO21114

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Oxygen Sensor Extensions

      Customer Reviews (5)

        Reviews of JMS Exhaust products have an average rating of 4.2 out of 5

          Questions & Answers

          10 More Questions

          Will It Fit My Mustang

          • Boss 302 - 12, 13
          • GT - 11, 12, 13, 14

              Related Mustang Categories