Enjoy $75 off SYNC 2 to SYNC 3 Kits with the code S2TOS3 until August 31st.

Enjoy $75 off SYNC 2 to SYNC 3 kits with the code S2TOS3 until September 30th

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

58 customer reviews


NaviUpgrade’s Ford Focus Sync 2/3 Upgrade Harness is designed to make upgrading your base model Focus to have Sync 3 an absolute breeze. Plug & Play, your install can be finished in as little as 45 minutes!

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.


Weight7 oz
Please Select Your Model Year

2012-2014, 2015-2018

Works on

This harness will work for a 4" to 8" Sync 3 Upgrade for all Ford Focus models, both in the United States and abroad, as long as your vehicle has voice activation (Sync or international voice command systems).

Does NOT work on

This harness will not work on vehicles other than the 2012-2018 Ford Focus.

  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.

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  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.

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  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.

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  4. Kevin W. (verified owner)

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

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  5. Swanson, Michael (verified owner)

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  6. Don (verified owner)

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

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  7. Stanley E. (verified owner)

    High quality product and extremely professional seller.

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  8. Anonymous (verified owner)

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

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  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.

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  10. Noe A. (verified owner)

    Great product! Easy installation!

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  11. Israel (verified owner)

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  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

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  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+++

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  14. Matthias G. (verified owner)

    a very high quality cable harness. just great.

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  15. Jose Retamar (verified owner)

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

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  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!

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  17. Stefan (verified owner)

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

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  18. John L. (verified owner)

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

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  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!

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  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!!!

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  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.

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  22. Anthony Lucas (verified owner)

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  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.

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  24. Martin S. (verified owner)

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  25. Anonymous (verified owner)

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

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  26. Jeffrey D. (verified owner)

    I was able to easily follow the Youtube instructions to upgrade my 2014 focus. I had a question and support got back to me quickly.

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  27. Brandon Avery (verified owner)

    I went with another brand harness before going Navi upgrade. The complexity of the install and Chinese stickers made me return it. The Navi harness was simple plug and play everything worked with one plug integrated into main harness. I did not use the files provided I performed configurations my self but nice to know they are available. 5 stars

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  28. Christian (verified owner)

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  29. Luis Rueda (verified owner)

    Doesn’t works, camera and park sensors does not displayed on the screen, I can’t use it, other hand I didn’t receive the correct programming files and also before make the purchase, I’m asked if it was compatibility with my car SYNC1 Europe version to sync 2 and I sent the VIN number couple times and never received the correct programming files. I’m waiting for my full refund, unacceptable more the one month try contact you guys but nothing ear from you. Order 4839 Sept 4, 2021.

    I hope my full refund.

    Thank you.

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  30. Nathan S. (verified owner)

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  31. Dennis M. (verified owner)

    great product!

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  32. mike (verified owner)

    harness looks well made .

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  33. Anonymous (verified owner)

    Great quality

    Image #1 from Anonymous
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  34. jglaramore (verified owner)

    I was able to install the harness with ease and when I did run into a few hiccups, I was able to get assistance by messaging the NaviUpgrade Instagram and got almost immediate replies. The only issues I had were due to ignorance on my part, but Brian did redirect me to helpful guides and information to help me set up my new radio!

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  35. Casper (verified owner)

    Easy install, and very quick and clear help with any questions. Brian was very quick with his responses and took the time to help me out. No experience with (car)electronics whatsoever, and not overly handy, but I managed to get it all installed in roughly 1.5 hours.
    Very happy with the upgrade!!!

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  36. Connor W. (verified owner)

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  37. Nichole K. (verified owner)

    I have been shopping online for years and I have to say, this has probably been one of my best experiences. Absolute pleasure to do business with. If you are reading this review and are trying to decide whether to spend the couple extra dollars for this or go with a far less superior product on eBay or some other source, let me help make that decision with one question… how much is your time worth? This harness setup is 100% plug and play. It takes more time to remove the dash trim. Quality is just unmatched. OEM type plugs. Customer support…. I’ve never been happier! Thank you for everything! I will most certainly be back!

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  38. Michael (verified owner)

    Cable was fantastic. Worked very very well.

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  39. Grayson M. (verified owner)

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  40. Matthew C. (verified owner)

    High quality easy to use and very good craftsmanship. There are ebay and amazon harnesses out there but I wanted the quality from the man that started this craziness! Thanks again Brian!

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  41. jhuraibi (verified owner)

    Worked great! Carplay now in my ’14 Focus. The how-to youtube video was extremely important.

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  42. CRISTHIAN ARANGO (verified owner)

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  43. Evan (verified owner)

    Expensive for a wiring harness but worth it for the support and programming.

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  44. Brian D. (verified owner)

    The harness worked perfectly. The only way I can think of to improve it would be to label the connectors so it’s a bit easier to figure out what plugs in where.

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  45. Michael M. (verified owner)

    One of my clips were broken on the harness but other than that it works as it should and took all the guess work out.

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  46. Spenser (verified owner)

    Mostly everything worked perfectly. The USB port pigtail connection needed a small adjustment to keep power when the vehicle ignition is on.

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    Video #1 from Spenser
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  47. Matthew A. (verified owner)

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  48. Gustavo (verified owner)

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  49. Ali Alsarmouti (verified owner)

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  50. Horace Evans (verified owner)

    Thank you for the help I really needed

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  51. AARON (verified owner)

    Worked great with no issues.

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  52. Austin (verified owner)

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  53. Wesley (verified owner)

    Works perfect and high quality.

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  54. Robert Peterson (verified owner)

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  55. Zach (verified owner)

    Great quality wiring harness. Super easy to put my new 8″ touchscreen in while following the NaviUpgrade youtube video!

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  56. Francisco Amaya (verified owner)

    Brian was great to work with and install was easy

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  57. tyler (verified owner)

    great harness works for what I needed

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  58. Ryan Janney (verified owner)

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