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COBB Accessport V3 ECU Flasher Fiesta ST 2014-2017 with mountune High Flow Air Filter
COBB Accessport V3 ECU Flasher Fiesta ST 2014-2017 with mountune High Flow Air Filter

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Sale price:$500.00
Savings: $39.00

Availability: Usually Ships in 2 to 3 Business Days
Product Code: AP3-FOR-001FA

Downpipe Type :

Engine Idle Speed :

Fiesta ST:

Flat Foot Shifting :

Fuel Octane / Type:

Intercooler type:

Launch Control :

Shift Assist :

Turbocharger Bypass Valve :


COBB Accessport V3 ECU Flasher Fiesta ST 2014-2016 with mountune High Flow Air Filter


  • COBB Accessport V3
  • mountune High Flow Air Filter
  • mountune Custom Calibration

The Accessport is the industry leading OEM ECU flashing, managing and monitoring assistant. Unlock power hidden within the ECU by replacing conservative factory settings with more aggressive calibrations. The standard Cobb Accessport from mountune USA includes all of the standard Cobb calibrations along with a custom mountune calibration* built to your specifications based on your modifications, octane, and preferences. The results are impressive gains in torque and horsepower with incredible custom features that can be adjusted to meet your requirements. With over 15 years of Ford 4 cylinder ECU calibration experience it's no surprise that mountune USA are partners with Team O'Neil Motorsports, LaRoza Racing, and O.D.D. Racing. And with multiple Rally America Championships won using mountune USA custom calibrations, our programming team has more Fiesta ST tuning experience than any other source available to you.

Mountune Performance calibration slot assignments

The mountune calibrations include 4 slots that are switchable at any time, on the fly, by simply pushing a few buttons. This is a very convenient feature that can be further adjusted in many cases. The default settings for the Fiesta ST are laid out as such:

  • Slot 1 - Standard high performance calibration
  • Slot 2 - Standard high performance calibration with indicated Launch Control
  • Slot 3 - Low boost performance calibration
  • Slot 4 - Same as Slot 1 with LESS spark (aka panic mode / bad fuel mode)

Maximize the performance of your Fiesta ST

For those who require additional support, the mountune ECU calibration can be optimized further with data logging and program revisions at no extra charge. Engine performance is enhanced by reviewing data logging files along with calibration revisions based on feedback from the end user. The duration of the calibration and file revision period for the chosen fuel type / octane is 45 days from the time the first file is sent to the customer, which is preloaded onto the AP when it ships. Multiple calibrations can also be requested during this time period. Once the 45 day period has expired the custom calibration period ends. Future custom calibrations are subject to additional fees depending on the exact nature of the request. mountune optimized Accessport calibrations are available only to customers that have purchased the Cobb Accessport directly from mountune. Custom programming options include, but are not limited to: MAP (slot) switching, Launch Control settings, Flat Foot Shifting settings, Ethanol (E30 & E40) support, 100+ Octane support, Gear Based Torque Limiting, Shift Assist, Idle Adjustment, Rev Limiters, Shift Light settings, and Advanced Wastegate Adjustments. *Please note this free offer for calibration optimization is not available for turbocharger upgrades, engine swaps, or nitrous oxide applications and applies to the original purchaser only. This service is nontransferable and other restrictions may apply. If you have questions about our mountune calibrations please do not hesitate to contact us directly at (714) 424-9400 or at usa@mountune.com for more information.

Ford Fiesta ST with mountune ECU calibration compared to the stock ECU calibration.


This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards. Click Here for Emissions compliance information.

Championship winning Fiesta ST with Mountune ECU programming and hard parts
Cobb slot switching, Launch Control, and Flat Foot Shifting explained

Average Rating: 5 of 5 Total Reviews: 18 Write a review »

  0 of 0 people found the following review helpful:
Fiesta ST December 25, 2017
Reviewer: Tom Greenwell from Cordova, TN United States  
I bought a bought an accessport for my son. The order process was easy ...the price was nice since you're included a free flowing air filter. Planning on hooking it up this afternoon. All has gone well so far.

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  0 of 0 people found the following review helpful:
Great Value and Great Product! September 5, 2017
Reviewer: Sean Manley from Portland, OR United States  
This is the best $500 you can spend on the car. It totally transforms the Fiesta ST and gives it that bit extra while remaining totally liveable and manageable. The custom tuning is just the icing on the cake!

I can't wait to go Stage 2 with the Intercooler and Intake.

Thanks to Ken, Dan, Eric and the whole team for all you do for the FiST community!!


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  0 of 0 people found the following review helpful:
Perfect December 18, 2016
Reviewer: Matthew Zamora from Coral Springs, FL United States  
If you buy a FiST you need to buy this.  Immediately! I had 10k before I finally purchased the AP and i regret not doing it earlier.  Randy's OTS tune is incredible. The pedal response makes the car feel more "hyper". you really notice the extra boost in the lower ranges. It's even harder now to stay out of trouble then before.

If you plan on buying a FiST you must plan on installing the AP.  Perfect!

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  0 of 0 people found the following review helpful:
Awesome November 2, 2016
Reviewer: AJ from Louisville, KY United States  
As said before it really wakes up the fiesta st.  Mine is a 2016 with just over 1000 miles before the tune. Install simple and easy. For me I just set it and forget it especially since the broad torque range with increased kick was all I needed. Coming from past cars like Infiniti Q50s rwd, ms3 gen 2, and series two Rx-8..the fiesta st is by far the most fun car I have ever owned. Thank you Mountune and Cobb.

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  0 of 0 people found the following review helpful:
Nice product but no stickers August 26, 2016
Reviewer: Justin Durant from Rome, NY United States  
Overall I'm satisfied with the tuner and filter the tuner was easy to use and the filter was easy to install. Shipping was a little longer than expected but was understandable since I live across the country. I wish mine had come with stickers too(I like to represent!) Not a big deal though. Overall I'm happy with the product and would definitely recommend to everyone for their first mod to their fiesta st. Randy has been great to work with so far as well.

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