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

Unfortunately, we're out of stock :(

Not to worry, we'll be back in stock soon. We've got an order in with our supplier, with an estimated arrival of . If you'd like to be first in line for our Easy 2015-2019 Ford Fiesta 4″ to 6.5″ Sync 3 Upgrade Wiring Harness, then please feel free to place a backorder, and your order will ship the day that we get back in stock.

Easy 2015-2019 Ford Fiesta 4″ to 6.5″ Sync 3 Upgrade Wiring Harness

6 customer reviews


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

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

Available on backorder


Available on backorder

The NaviUpgrade Ford Fiesta 4″ to Sync 3 Upgrade harness is perfect for the DIY-er who is looking to add Sync 3 to his or her 2015-2019 Ford Fiesta!

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.

Weight9 oz
Model Year


  1. Mr.YODCHAI SOWAPAS (verified owner)

    Received the product successfully wait for installation If installed successfully, I will review it again. Thank you.

    (0) (0)
  2. Aaron (verified owner)

    Easy to use, well made. You won’t find one of these anywhere else. Don’t try the cheap ones on EBay like I did. It won’t fit! The value of customer service and included programming makes this a no brainer. Please get this harness, I can’t stress enough how valuable the resources you get with this are. There were multiple points in the project I would have given up if it weren’t for the amazing support from NaviUpgrade. I will continue to buy their products for any other project I do.

    (1) (0)
  3. Alexandre G. (verified owner)

    Only reason it’s not a 5 star is the price. Amazing product that works super well. Overall a great purchase.

    (0) (0)
  4. Julian B. (verified owner)

    Added a custom part to retrofit my car with sync 2

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  5. Felipe M. (verified owner)

    The product was what I expected but what a terrible customer service they have, several times I sent an email and they never replied to me, to date I still have my doubts about how to install and update because you do not respond, when I bought it it was mentioned that I would have help from NaviUpgrade but it was not like that.

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

      Hey Felipe, can you please email me? support@naviupgrade.com. Our ticketing system fully corrupted in April and we moved to just email since we lost all tickets with the previous platform. Happy to get this sorted for you. Thanks!

  6. joshua r. (verified owner)

    Great and easy to install

    (0) (0)
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