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SR Performance O2 Sensor Extension Kit - Pair (86-10 All)

Item 56013
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      Review & Installation Video

      So you just installed a new set of long tube headers or an aftermarket midpipe, and now your factory O2 sensor harness is a little too short. If that sounds like you, this O2 sensor extension kit is your solution. This kit for your ’86-’09 Mustang includes two harnesses that extend both your primary and secondary O2 sensor wires by 18 inches. That should be enough to bridge the gap between your factory O2 sensors and your factory harness. The great thing about this kit is that it’s completely plug and play, so there’s no need to hack up your factory harness in order to extend your wires. It’s a very straightforward install that should take you no more than a few minutes. If you’re pumped to install that new off-road x-pipe, or that new set of headers, only to find that your O2 sensors no longer fit, this kit will solve that problem easily without breaking the bank.

      Product Information

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


      • Extended O2 Sensor Harness
      • Great for Modified Exhaust Systems
      • Easy Installation
      • 18" Long
      • Sold as a Set of Two
      • Fits All 1986-2010 Mustangs


      "Plug and play". When your modify your exhaust system, sometimes the stock O2 sensor harness just comes up too short to connect the O2 sensors, but this SR Performance harness extension kit will help bridge the gap.

      Great for modified exhaust systems.
      If your stock wiring harness is too short to connect your existing O2 sensors to a new set of headers or a mid pipe, don't just leave the old wires dangling - because your car just won't pass inspection. Instead use a set of 18" O2 Sensor Extensions to make the connection a snap.

      Application. This pair of SR Performance O2 Sensor Extensions is designed to fit on all 1986-2010 Mustang exhaust system configurations.

      Please Note. The Extensions are intended for use to extend to upstream O2 Sensors; however, they can be used upstream or downstream if needed.  O2 Sensors are not included.

      Technical Note. Removal of directional tabs on connector ends may be required for proper fitment on some applications.

      SR Performance

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

      MPN# 56013

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 100+ customers

      • February 06, 2020

        4 2004 Cobra - 4vinmyGT

        SR O2 Sensor Extension Kit

        04 Cobra-The O2 Extension Kit is great quality. Unfortunately 8t wasn't long enough for the BBK X-pipe.

        Helpful (0)
      • January 27, 2020

        4 2000 GT - Jeff2000GT

        Simple. Great price.

        Received them within a couple days of ordering. Worked exactly like advertised. Good price.

        Helpful (0)
      • January 19, 2020

        5 2007 GT - Trewingo


        Great product, excellent condition. Came just as the product had shown.

        Helpful (0)
      • December 28, 2019

        4 2003 GT - ryuujin013

        May fit the passenger side only

        The O2 plugs post cat on my 03 GT are mismatched, and I suspect that is normal so the connections cannot be crossed from bank to bank. These extensions were identical, so they only fit the passenger side ( which worked fine for me, 'cause that's the sensor that had been moved ). I called support, and they advised that if you want these to fit the driver's side, you may have to shave off the plastic tabs around the fitting that mis-align with the grooves of the driver's side plug. Other than that, they were a direct and tight fit and left plenty of room.

        Helpful (1)
      • December 26, 2019

        5 2004 V6 - VictorOrta78

        O2 sensors extensions

        Absolutely a must have, either to plug in far O2 sensors or just to make it easier to plug into or unplug O2 sensors. Best-liked, needful, essential, well recommended even if you think you dont need it just buy it, wont regret it. Also $ low cost.

        Helpful (0)
      • December 21, 2019

        3 2007 GT500 - 08Stang

        Not a perfect fit

        We believe these will work if we cut off 2 tabs on the male end and the female end is a tight fit.

        Helpful (0)
      • December 17, 2019

        5 2001 GT - RoyM

        Great !

        Came on time, product detail is very nice and picture like. Just the right fit for the job

        Helpful (0)
      • November 12, 2019

        3 2010 V6 - EliseoMunoz


        Another cases you do have to snip off the tips of each side to make them fit but in other words they're nearly almost impossible to snip together so the wire attaches to the other side because the clip is not long enough to attach it so you have to make a couple of modifications but in other words it does work for the O2 sensors

        Helpful (0)
      • November 01, 2019

        5 2006 GT - MARK

        O2 ext

        They are great quality very sturdy and my shipping was fast and prompt

        Helpful (0)
      • October 24, 2019

        4 2006 GT - DeAnne

        Nothing is perfect.....

        Used these for the upstream sensors on my '06 GT. I had to trim off the alignment tabs on the connectors to fit, like the text in the notes mentions. I should also mention that the protective sheathing on one of the cables was worn through where it was bent in the packaging. No idea how this happened, but since I didn't have time to order another cable, I just put ribbed plastic tubing over both cables and called it a day. Plenty of length on the pass. side, just enough on the driver's side, with Py... long tube headers. No MIL's yet.

        Helpful (0)

      Questions & Answers (24 answers)

      5 Top Rated Questions

      Do i still need to turn off the rear o2 sensors if I use this with an off road a-pipe?

      • The check engine light will still appear as this would just be an extension harness so you can plug your o2 sensors up with long tube headers installed.

      Helpful (3)

      Do you still need to turn off your rear o2 sensors when using this with an off road xpipe? Bbk off road to be specific.

      • These will not remove the check engine light when doing an off-road mid-pipe since these are just an extension to still bolt up the o2 sensors.

      Helpful (2)

      I have an 08 GT w/ Kooks LT headers, Kooks catted H-pipe, Ford Racing Exhaust, Ford Racing Hot Rod Cams, Steeda CAI, and Dyno tune. My check engine light has been triggered since I had the car dynoed. The code is for the cats. I believe it is a false reading because the catts are high flow. The bama tune I had prior to getting it dynoed turned off specific functions of the computer to prevent this problem. Will these extensions keep the light off?

      • The SR Performance O2 Sensor Extension Kit is simply an extension so the harness will reach when the O2 sensors are relocated, such as with Long Tube headers, but this will do nothing for check engine lights..

      Helpful (1)

      Does A bad O2 sensor make the rpm flutter? And engine cut in and out

      I have a 2008 GT500 and I was about to buy an offroad H-pipe and a set of MIL eliminators. However, I can't find MIL eliminators for my body style. These 02 sensor extensions are all I can find. Do they keep the check engine light from coming on when removing cats?

      • This is simply to extend the oxygen sensors on your vehicle when upgrading your exhaust. We do not carry MIL eliminators or any other piece to remove the check engine light.

      Helpful (0)
      10 More Questions
      I have a 2004 mustang GT and I’m looking forward to buying a BBK o/r x pipe, I don’t want the check engine light coming on so would these help or do I need MIL eliminators? 1 answer
      I’m thinking of buying the slp loudmouth exhaust for my 04 Mustang got but was wondering if I would need these? 1 answer
      I’m planning on putting BBK long tubes and catted H-pipe on my 03, will I need these O2 extensions? 1 answer
      I am installing jba longtubes and jba catted h pipe on my 07 gt. Will i need one pair or two pairs of these extensions? 1 answer
      Will I need these extensions on a 04 Cobra with stock manifolds and a Mac Pro chamber? 1 answer
      i'm modding on a budget. i'm planning on getting pacesetter long tube headers and kooks catted h pipe. will installing this stop the engine light or would i have to find eliminators (not trying to run a tune) 1 answer
      Would I need these for my 2014 mustang v6 if I was going to order the chambers off road h pipe? I have touring axle backs and I want to increase the sound but not make it too loud. I heard I need these so the sensor doesn't come on? 1 answer
      will this fit on my 2006 4.0 mustang for the downstream o2 sensors? 1 answer
      Will these work and fit properly on MAC long Tube headers?? 1 answer
      I was adding an off-road H pipe and long tube headers on my 08 mustang. Does that require me to use a Mil eliminator and these O2 sensors? I cannot find 05-09 mil eliminators online so does that mean I will only need these extensions and the check engine light will stay off? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) O2 Sensor Extensions

      Tech Specs

      Will It Fit My Mustang

      • Bullitt - 01, 08, 09
      • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
      • GT500 - 07, 08, 09, 10
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 86
      • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10

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