COBB Accessport V3 Focus RS 2016-2018

98% of 100


  • Quick And Easy Installation
  • Clear Engine Codes
  • Multi-Gauge Display
  • Automatic Dimming Feature
MSRP $725.00
You save 10%

COBB Accessport V3 for 2016, 2017 and 2018 Focus RSs.

Now is the time to treat your 2016-2018 Focus RS to the quick and easy ECU flashing and on-board gauge monitoring that the COBB Accessport V3 (P/N: AP3-FOR-004) can offer you!

The new COBB Accessport V3 will unlock the hidden potential of your Focus RS while providing you a large, full color high-resolution screen that allows you to monitor up to six parameters in real time. The fully customizable look, layout, and mounting options will surely provide you and your 2016-2018 Focus RS infinite possibilities. Best of all, the COBB Accessport V3 features the processing power, memory and storage to easily flash your 2016-2018 Focus RS quickly while storing all of your maps and logs.

Accessport V3 Features:
- Quick and Easy Installation
- Intuitive Uncomplicated Interface
- Read, Diagnose and Clear Engine Codes
- Stores Up to 100 Off-The-Shelf (OTS) Maps
- Monitors Live Information Directly from ECU
- Data logging for In-Depth Evaluation
- Customizable multi-gauge display
- Performance Measuring Capabilities
- Programmable Shift Light
- Simple to Revert Back to Stock
- Interchangeable Face Plates
- Automatic Dimming Feature
- Compatible with ALL USDM, EDM and CHDM Models
- Set Enable/Disable Auto Start-Stop
- CARB Approved with EO# D-660-6

*CARB Approval is ONLY for 2016-2017 Focus RS models. This product is NOT CARB approved when used with the 2018 Focus RS.

Tech Tip: Several COBB Custom Features (CCF) are now user adjustable through the Accessport for the Focus RS.  These adjustments include changing map slots, turning custom traction control on/off, adjusting the amount of slip the custom traction control enables and now the ability to enable 2WD Dyno Mode to keep you from disconnecting your rear differential unit when on a 2WD Dyno. These adjustments can be found under “Tune” -> “Adjustments” -> then select which new feature you’d like to adjust. It’s important to note that the CCF Accessport Adjustment are dependent on the calibration file being used. For example, the Traction Control feature must be enabled via a custom tune (Custom Tune is NOT Included).

2016-2018 Focus RS Power Increase:
Stage 1 - 91 Octane Gains: Peak HP: 3% / Max HP 11% - Peak TQ: 5% / Max TQ 11%
Stage 1 - 93 Octane Gains: Peak HP: 5% / Max HP 13% - Peak TQ: 7% / Max TQ 13%

*Peak gains are measured as the difference between the highest points of the two plots. Max gains are measured as the largest gain at any single point between the two plots, results may vary.

The Accessport V3 is the world's best-selling, most flexible, and easiest to use ECU upgrade solution on the market today. COBB will help you unlock the power hidden within the new Focus RS by replacing the conservative factory settings with a much more aggressive calibration. Whether you follow their staged upgrade path with pre-loaded Off-The-Shelf (OTS) maps or use custom mapping for any modification level, this will be the last engine management solution you will ever need.

Please Note: Use can use your PC or Mac based computer to manage maps, download recorded datalogs or quickly update your Accessport. To ensure your new Accessport V3 is up to date, please click HERE to download the latest version of COBB’s Accessport Manager for free.

California Residents: Proposition 65 Warning

This item is 50-state legal (CARB E.O. Number D-660-6)

Installation Difficulty


Novice skill is required for this installation.

Installation Videos

Video Transcript

So far we've done some basic modifications to our Focus RS including a MagnaFlow exhaust system and a Turbosmart Blow-Off Valve. The next ideal step on this car as far as modification goes is a custom tune. We've had excellent results with a COBBs Accessport Tuner on previous EcoBoost vehicles, so today we're going to install the Accessport on our 2016 Focus RS.

The COBB Accessport Tuner is going to be one of the best ways to truly unlock the performance potential of your Focus RS. Quick and easy ECU flashing with multiple maps built in, and with onboard gauges, diagnostics and performance monitors as well. The kit includes the Accessport itself with a case, a changeable face plate, a mount for your dash, a cable for downloading additional maps, and a cable for connecting to your car.

Before we get into installing the Accessport on our RS and hooking it up and showing you everything it's capable of doing, we have a couple of questions that we know you're going to ask. The first one, what kind of power does it make. We actually don't have a dyno so we can't actually dyno the car, but what we can do is give you COBB's rated power changes which given cars in the past we have been able to dyno are spot on. With a stage 1, 91 octane tune, they're showing a peak gain of 3% in horsepower and 5% torque, with a maximum gains in the curve of 11% and 11%. With a 93 tune, you're looking at 5% horsepower peak and 7% torque with max gains of 13% horsepower and 13% torque, with the curve you're going to see a lot more power across the bands to make the car feel a lot quicker.

Second question we know you're going to ask, "Will this void my warranty?", what I always say with this, check with your dealer. Go back to where you bought the car, tell them what you're looking to do and see if they're going to void your warranty or not. We can't guarantee anything with it. Obviously you are flashing the car, simply flashing it should not void your warranty, but you know we always suggest, check with your dealer to make sure.

First thing we're going to do is plug in the Accessport. To do that, there's a little cover here that says OBD II on it. You simply pull on this, drop it down, and plug it in. Now take the other end of the cable, we're going to plug it into the bottom of our Accessport, and it'll turn on. You know you have the correct one because you'll see the RS pop right up on the screen.

The first screen just tells you what the buttons do. Basically you have up, down, you’re okay or select button, and then a cancel. We're going to continue by hitting the center button.

When you first install your Accessport, you only have two options. Basically install it to the vehicle, and troubleshooting. You can actually use this on other vehicles if you want to run DTC codes and get a check engine light, basically diagnose it and shut it off. We're not worried about that for right now. What we're going to do though is install the Accessport to our RS. To do that, we're going to select. Now what it's saying here, it cannot communicate because I forgot to turn the car on. What you want to do is just hit the start button but don't start it.

Now what it's telling me here is just make sure you do have the correct vehicle, a USDM Focus RS, correct. Hit continue. Basically what it's giving out are our several different tunes available. Even anti-theft mode which is just basically just a safety tune. Stage 0 which again is basically just a factory stock tune, there's no benefit really there. The ones you're going to want to use are going to be the stage 1 tunes. Now currently, stage 1 is the only thing available. Eventually there will be additional maps though that will offer stage 2 and stage 3 for further modifications. Stage 1 is going to be for your stock RS, or very basic modifications such as the catback like we're currently running.

Here you want to choose what fuel you have access to. In our case, stage 1 93 we're going to go, because we do have 93 octane fuel here in Pennsylvania.

Here it's going to tell you that a battery charger is recommended because it does take a little bit of time. If you have a low battery, it can lock up in the middle of the tune. We know ours is good so we can continue.

What it's going to do first is take the original factory tune and download it and save it. This doesn't take too long. Your dash is going to go haywire. You're going to hear buzzes and beepers and lights and all kinds of crazy stuff going. Don't worry about it, it's perfectly normal. While this is downloading, I should mention when you first install your Accessport to your RS, this will take the longest amount of time. This is probably a 20-minute roughly install to do it. After this though, once it's installed, when you go to upload a new tune or change your tune, it's going to be much, much faster.

Now when it reaches a hundred percent, now what it's going to do is it's going to re-flash our computer with our new Accessport tune. You'll find this part will go a little faster than the initial download.

Now it's resetting everything. Again, lights are going to go off, all kinds of crazy noises. This is the screen you want to see, installation successful. Now at this point, we hit the stop button. Turn everything off and wait about 15 seconds like it says.

Then you just let the car shut down, is what you want to do here. Once the screen and everything goes off, now we can clutch in, and start out car.

Okay, now you'll notice, we have a lot more stuff on the screen than we did initially. We have gauges. There's your performance parameters. Again we still have our check engine light. Here's where you can actually change and tune to adjust for different maps, and if you ever got rid of the car, here's how you uninstall it. First thing we'll do is to through the gauges.

Let's just see. These are basically your display options. You're going to have one large gauge, a couple gauges, all the way up to six different gauges displayed on the screen. Now basically, depending how you want to use it, and what you want to mod or you can choose what you're going to go with.

First thing we'll go with a three gauge set up. This is basically what the screen is going to look like. You have three different things I'm monitoring here and you get the numbers and you also get a bar graph. Now what you want to do here though is go through it and you want to change monitor by clicking on it, and then here is all the things you can check, and there is a ton of different things. You can make that one actual AFR. A second one will change the monitor, I guess, and you've got tons and tons of different options here. Boost is always fun. Coolant temperature. Desired stuff, and we can go with, well the basic one, we'll go with engine RPM.

Built in along with this right here, you see these five dots. It's actually a programmable shift light, again also built in to this, so the amount on your dash, not only can you log all these different things, see all these different things, you have a shift light built in as well.

Now here if you want to actually log, hit okay there. What it's doing now, it's actually going to start logging these things so if you want to record a run, record a test pass, you're doing a custom tune, have to get some logs to your tuner, this is where you're going to do that. Again like I said, when you go into this thing as far as setup goes, change monitor, anything that the OBD II can read, you can actually log, so you've got tons and tons of stuff in here. If you are going for a custom map on your COBB, whoever your tuner is, they'll tell you what on here to monitor, but again you've got tons and tons of different options.

One of the gauges you have performance, and what this is, you actually can do a 0 to 60 and do a quarter mile with the COBB tuner. We'll go to 0 to 60 first, and it's warning you, you don't want to do this on a public road, try to find someplace safe if you're going to do this. Basically what it's telling me to do now is go to wherever it is, and as soon as I start accelerating, it's going to start recording.

I'll do the same for the quarter mile. To begin it, you basically go to a still place and as soon as you start accelerating, you don't have to worry about hitting a button or anything, it'll start recording.

The next step down, said it's your troubleshooting, this is where your check engine lights are going to be. You have here, you can go in here, you can basically read the memory, find out what tune it's in, and what's going on in your computer. Here's where you're going to be able to read your codes if you do get one, and here's where you would clear them out.

The final thing is your actual tune page. This is where you can go in, you can change maps, you can go with your original maps, it'll show you what map is currently on the car. You do get a custom map again from an after-market tuner, you're downloading it to this via the Accessport manager, this is where you would go to change to a different tune.

You see the COBB is without a doubt in my opinion, one of the easiest tuners to use. The full-color screen is absolutely fantastic and said this will do a great job of tuning your RS.

Although we don't have a dyno to do a before and after test, given our experience with the Accessport on the Focus ST and the EcoBoost Mustang, I expect the gains advertised by COBB for the RS to be very accurate if not a little bit on the conservative side, plus you have access to the Accessport manager where you can download future maps and custom tunes as well.

To give you some more power and more control for your Focus RS, make sure you check out the COBB Accessport.

Vehicle Fitment

This product will fit the following Focus years:

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