Easy 2012-2014 Ford Focus 4″ to 8″ Sync 3 Upgrade Wiring Harness

Not yet rated(6)

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!

$229.00

4" to 8" Sync to Sync 2/3 Base Upgrade Harness
1 × 4" to 8" Sync to Sync 2/3 Base Upgrade Harness

Out of stock

$229.00
Placeholder
1 × 2012-2014 Focus Hazard/Central Locking Button Pigtail

In stock (can be backordered)

Out of stock

The NaviUpgrade 2012-2014 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 2012-2014 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
Works on

This harness will work for a 4" to 8" Sync 3 Upgrade for all 2012-2014 Ford Focus models that have SYNC, both in the United States and abroad, as long as your vehicle has SYNC voice activation.

Does NOT work on

This harness will not work on vehicles other than the 2012-2014Ford Focus.

  1. Anonymous (verified owner)

    Wiring harness appears to be quality made, plugs fit perfectly and is a great product. Although i was slightly suprised by the lack of instructions/packaging. However the corresponding Youtube video compensated for the lack of instructions, and was very explanatory, easy to follow.

    (0) (0)
  2. David G. (verified owner)

    Excellent quality. Exceeded expectations because leads were labelled, greatly easing the installation!

    (0) (0)
  3. Jackson Rains (verified owner)

    Sync APIM is not getting any power from harness.

    (0) (0)
    • Brian Lovelace (store manager)

      Hi Jackson — all harnesses are tested before shipping. Please ensure you do not have a faulty APIM module by connecting to FORScan and scanning the car to a new profile. If the APIM is listed but not turning on, you have a faulty module. Please reach out if you have any questions. Thanks!

  4. Jonathan Hurley (verified owner)

    (0) (0)
  5. Kevin M. (verified owner)

    Buy this harness. The one on eBay is absolute junk. I know, I made the mistake of buying that first and having to redo the whole setup because I wanted to save a few bucks. This harness is such better quality and it works flawlessly. Brian is great to deal with!

    Image #1 from Kevin M.
    (0) (0)
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Hi everyone,

Our 4″ to 8″ Sync 2 and Sync 3 harnesses are currently out of stock — and due to the newly announced 145% tariffs on Chinese imports by President Trump, we won’t be able to restock them for the foreseeable future.

For the past couple of years, these harnesses have been made in small batches of 100 through a vetted overseas factory, as U.S. manufacturers require much larger order quantities, and have much higher prices than we can realistically support. Even at $229 with free shipping, free programming files, and lifetime support, our margins have been thin on these harnesses.

With the added cost of tariffs, continuing production is no longer sustainable.

We’re exploring new options outside of China and hoping this is temporary, but for now, this product will remain unavailable. Other products on our site will remain available as they are sourced from the US.

Thank you for your understanding and support.

– Brian
Founder of NaviUpgrade

Posted April 13th, 2025