(25 customer reviews)

Easy Ford Focus 4" to 8" Sync 3 Upgrade Wiring Harness


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The NaviUpgrade Ford Focus 4" to Sync 3 Upgrade harness is perfect for the DIY-er who is looking to add Sync 3 to his or her vehicle. Unlike other sellers, NaviUpgrade was the first to successfully convert a base Ford Focus to have Sync 3.

At NaviUpgrade, we offer two variations of our Ford Focus conversion harness; one for the 2012-2014 Ford Focus and one for the 2015-2018 Ford Focus.

We also offer FREE programming files with your purchase, something no other online store does. This allows you to get up and running quickly using an OBDII dongle, without messing around with a bunch of settings or hex codes in FORScan.

Please feel free to check out our Guides tab for more information on what other hardware you'll need to complete your upgrade.

We pride ourselves in providing the most value out of any online store when it comes to Sync 3 Upgrades. NaviUpgrade is constantly working on building out resources for our customers and fans to use on their own vehicles. Our goal is to empower all vehicle owners to feel comfortable upgrading their own vehicles. Join us in our Forum and talk about your upgrade experience, or help others with theirs.


This harness will work for a 4" to 8" Conversion, also known as the Sync 1 to Sync 3 Upgrade for any base model 2013-2018 Focus.If please select if your vehicle has automatic (digital) or manual HVAC controls. If your HVAC panel isn't listed, please be patient, we'll release a version for your car soon.Please be aware that this conversion harness and programming file combination will not work on vehicles other than a 2013-2018 Focus.
Shipping & Delivery
Free 2-3 Day Delivery for all US Purchases

Flat $70 Fee for International Shipments
If shipping costs more, we cover the cost, if it costs less, you get reimbursed the difference.

25 reviews for Easy Ford Focus 4" to 8" Sync 3 Upgrade Wiring Harness

  1. Robert Symanowicz (verified owner)

    I got this harness to upgrade my 2017 ST1 to sync 3 and it arrived very fast. It's very simple without extra connections I've seen on others and is working phenomenally. The help I got from Brian with the install was a huge part. I will definitely be looking for more products and can't recommend this enough. Such a huge upgrade.

  2. Tim Irizarry

    Harness came and worked as described. Shipping was fast, customer service was excellent. Couldn’t recommend NaviUpgrade any more for their services, if you’re looking to swapping your base sync unit to sync 3 highly recommend them.

  3. Harrison Schafer (verified owner)

    I couldn’t recommend this harness more. Not only does it come with all the needed programming, but it’s super easy to do, especially if you follow along with Brian’s videos on the NaviUpgrade YouTube channel. I had a question during my installation and Brian had the answers to me within minutes. If you’re going to do the swap, do it right and get this harness.

  4. Kevin W. (verified owner)

    Awesome awesome company ! Very easy to install and if problems occur they respond instantly

  5. Swanson, Michael (verified owner)

  6. Don (verified owner)

    Worked great! Would recommend! SYNC 3 is so nice!

  7. Stanley E. (verified owner)

    High quality product and extremely professional seller.

  8. Anonymous (verified owner)

    Works as described, customer service and support was speedy reply as well

  9. Nicholas A. (verified owner)

    Loving my Sync 3 system and this wiring harness made it easy. The documentation was great and I was able to complete the update in about 3 hours on a Saturday afternoon.

  10. Noe A. (verified owner)

    Great product! Easy installation!

  11. Israel (verified owner)

  12. Luis Xavier Perez Solis (verified owner)

    It's perfect, I didn't have a single problem, the shipping was very fast. I had some questions and they answered them very quickly. I live in Mexico and arrived two days later. thank you very much bryan! Greetings from Tabasco, Mexico

  13. Kevin A (verified owner)

    This is exactly what I needed. It fit perfectly and the instructions were very easy to follow. Email support is very fast to respond. I would recommend naviupgrade to anyone AAA+++

  14. Matthias G. (verified owner)

    a very high quality cable harness. just great.

  15. Jose Retamar (verified owner)

    Great product and even greater customer service.Brian is the man. He walked me thru the whole install.🙏🙏🙏🙏

  16. Jon M. (verified owner)

    This harness and the included asbuilt files make the Sync 1 -> Sync 3 upgrade a breeze. This is an afternoon of work (at most), that totally changes your interior. Navi-Upgrade shipped very quickly, and between the youtube videos, and guide on the website it's easy to source all of the required parts. I highly recommend this upgrade to anyone with Sync 1!

  17. Stefan (verified owner)

    Awesome stuff. Aside from the harness Brian was beyond helpful throughout the process.

  18. John L. (verified owner)

    Fast shipping, Easy install, and all's good! great customer service also!

  19. Zach (verified owner)

    Product worked great! Brian’s help through the process was amazing though!! He went above and beyond to make sure that my install went perfect, couldn’t be happier!

  20. Joshua L. (verified owner)

    i had messed up
    in my build i was doing and the owner was a super nice guy. very helpful and super genuine. i'd recommend this company to anyone who's looking to get a harness or any parts for it. what a great company! love you guys!!!

  21. Brad Q. (verified owner)

    Sync 3 works as if from the factory, ridiculous how easy it was to install, program, and use due to this harness being available. The harness has a professional quality to it, that matches OE. File download and programming was flawless. Brian is quick to respond to any questions.

  22. Anthony Lucas (verified owner)

  23. Gregory K. (verified owner)

    Harness works great and seems high quality. Nothing is too short or too long. Install and flashing new APIM and ACM following the YouTube video was super easy.

  24. Martin S. (verified owner)

  25. Anonymous (verified owner)

    Worked perfectly, made installation really easy, and guide videos on YouTube made the entire process smooth.

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