DK Custom Products

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ViED Fuel Enrichment for Harley EFI Plug-n-Play..More Details

Regular Price: 149.95

Special Price 139.95

Availability: In stock
Item #: DK-VIED-NR
Manufacturer: DK Custom Products

Plug-n-Play Fuel Enrichment for Fuel Injected Harley-Davidsons ViED Lowers Engine & Exhaust Temps - Improves Throttle Response For Touring baggers dyna sportsters softail v-rod DK Custom Nightrider

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Dynamic Tuning For Harley-Davidson Motorcycles
Variable Inline Enrichment Device


Cost Effective Alternative to an Aftermarket Tuner & Dyno Runs.

This Patented Device Dynamically Adjusts to Changes Made to Your Bike!

ViED's will Cool Your Bike Down & Make it Run Better!


The Plug-n-Play ViED richens the Air Fuel Ratio from14.6:1 to a range of 14.3-13.9:1 in closed loop mode.  

This Variable Fuel management upgrade allows you to fine-tune the air fuel mixture with a small screwdriver.

Immediate Benefits:

  • Lower Engine Temperature
  • Lower Exhaust Temperature
  • Improved Throttle Response
  • Reduced Surging
  • Reduced Pinging




  • Touring  2007-2009
  • Softail  2007-2011
  • Dyna  2007-2011
  • Sportster  2007-2013
  • V-Rod 2007-2011

 Recommended for: Stock Bikes, & Stage I Bikes (High Flow Intake & Exhaust) Will NOT Work with Stage II, III, or IV.


Simple install-comes with instructions.  No tools required, installs in a few minutes.

They work inline with the stock H-D narrow band 02 sensors and Delphi ECM to richen the fuel mixtures, adding up to 6% more fuel to the engine in closed loop mode.

There is an indirect richening of the open loop fuel mixtures through the learning mode, or adaptive fuel value action built into your ECM.  This ensures the richer 13.8-12.5:1 AFR's are ALSO adjusted in heavy/full throttle operation.


LINK to All Dynamic Tuners

Finally my bike is running right. Surging is gone, heat is way down. -Jason


"409” ignition wires provide continuous heat protection up to 600-degrees Fahrenheit

Posted by Stephen P Mullen on 10/1/2009 to HD Tech Notes


What do the 131/151 codes mean?
The codes are specifically listed as P0131 and P0151 codes. The description in the Service Manual is:
P0131    Front O2 sensor low or engine running lean
P0151    Rear O2 sensor low or engine running lean
The key point to look at here is "O2 sensor low" when analyzing what is happening with the XIED's in place. The O2 sensor produces a 0.0 to 1.0 Volt output. Any voltage lower than a preset threshold in the ECM can trigger the 131/151 errors. Lower voltage equates to a leaner fuel mixture in the eyes of the ECM. The XIED's take a higher voltage from the O2 sensor and "shift" it to a lower voltage for the ECM to read. In some circumstances, the ECM will see this low voltage as "too low" and trigger the code despite the fact that the engine is running rich enough. The IED's take advantage of this voltage shift to richen the mixture.
So the engine can be running rich and the ECM might still trigger the "sensor low" signal.
There are also other reasons that the ECM will trigger the codes that we will try to cover below.

Will these codes hurt my bike?
No. These are historic codes and are not active. As long as these are the only engine codes you have and you do not have an active Check Engine light on, they can be safely ignored.

Do all bikes get these codes with IED's installed?
No. Many bikes never see these codes. You could also have the codes and never know it. Unless you check the historical codes on your bike, you might never see these.

Do completely stock bikes get these errors?
 Completely stock bikes get these 131/151 errors on a regular basis as evidence that Harley has included a note to "clear and ignore" these codes in their Service Manual.

Don't historical codes mean there is a problem?
No. Historical codes only mean the ECM saw something it did not expect. If the code is considered a potential problem or there is a risk of damage to the engine, the ECM will turn on the Check Engine light. No such situation exists with the 131/151 codes. The Harley Service Manual actually notes that these codes should be "cleared and ignored".

I have read that these codes cause the ECM to revert back to open loop mode. Is this true?
No. The ECM will only revert to open loop operation if there is an active error code. Active error codes will cause the Check Engine light to come on. As long as you have no CE light, your bike will run in closed loop for normal riding situations.

When I take the XiED's off my bike, the codes go away. Doesn't this prove the XiED's are creating the problem?
No. It can be easy to confuse the installation of the IED's as the cause of the error. This is a normal reaction and quite understandable for the average rider. In engineering circles there is something known as "root cause" analysis. The "trigger" mechanism is not always the cause of a problem. In this case, the "trigger" is the IED's. The IED's do make the ECM more prone to showing these codes, but there are a host of issues that cause the codes. Harley has documented many of these causes in their Service Manuals. A copy of the specific section of the Service Manual is listed below.

Are there other things that can cause the error codes?
Yes. We have information from an EPA testing laboratory that there are several other issues associated with these codes. These are engineering issues that are deeply embedded into the HD Delphi ECM. Our information also indicates that Harley is aware of these issues, but does not have plans to create any upgrades to eliminate know problems.

Can you get rid of the 131/151 codes?
 It is important that a rider ensure that they have eliminated the common reasons for triggering the codes with the IED's installed. The primary triggers are exhaust leaks and loose O2 sensors. Even the smallest exhaust leak can trigger the codes. We have found that many of the bikes that have codes will get rid of them when they carefully check their exhaust system.

Can I just run my bike with the codes and not worry?
As long as you do not get an active check engine light, you can run your bike with the IED's. For any active check engine light, you want to have that checked to find out what is setting off the CE light.

Customer Reviews

Vied Review by Tumble weed
Easy install and works great! Installed on my 09 Heritage classic . Adjusted twice after test riding set slightly over 40% better throttle response smoother running and cooler temps. With this and the DK catch can this engine is running 30 degrees cooler consistently, excellent alternative to a pricey tuner, highly recommend! (Posted on 7/24/2023)
Excellent Review by David
Installed them today took very little time and I'm completely satisfied with result bike runs better idles better and definitely notice the difference in throttle response everything I have ordered from them is always top quality highly recommend ordering them (Posted on 7/22/2023)
It really does work. No more surging. Review by Brian
I had my doubts at first. But after a couple of hundred miles, I notice a significant difference in the lower speed and cruising speeds in the city. (Posted on 7/8/2023)
Must buy. Review by CJ
Five stars plus. Immediate difference. Crisper, responsive acceleration, seemed like much more power, resolved the heat issue. 2009 Heritage set to 62.5. I modified with K and N high flow filter and VH Staggered Big Shots. Gave it a good, hard run. Less popping, too. Bonus! We'll see how it is in the long run. Customer service awesome. (Posted on 5/31/2023)
Bike does seem to run cooler Review by BiggDot
Easy install still playing with it I like it (Posted on 10/19/2022)
Too cold to ride Review by srobby
Quality seems good. Very easy to install. Unfortunately it is too cold and snowy to ride so I will update when I have a chance to test it out!
4 star for value may change if it works well. (Posted on 2/22/2022)
got rid of my low end flame out! Review by therealN8
i have had an issue with slow speed flame outs on my Nightster since i bought it, it already had a SE race tuner but still had the low speed issue. i was going to have the dealer redo the mapping and possible dyno tune(BIG $$$) then i came across a post talking about DK's VIED. well after reading more posts and reviews i finally pulled the trigger and boy im glad i did. no more flame out! no expensive retune from the dealer or outrageous costing dyno tune. im not trying to squeeze every ounce of power out like i did in my younger days, i just want a good running bike and because of DK's VIED i do!! Thanks DK i would definitely recommend this to anyone having fueling issues as a 1st step before spending big money on other options... N8 (Posted on 2/18/2022)
perfect for stage 1 Review by chad
did not want a tuner for stage 1, felt it would be a waste of money, but had to address the lean condition (more lean than factory i should say) that adding an air cleaner and free flowing exhaust create. VIED's are perfect on my '07 FXDL (running 50%), bike runs strong and haven't had any issues. super easy install, nice alternative to the more expensive tuners. (Posted on 12/16/2021)
VIED Easy install slight adjustment works well Review by SMILEY
Installed a few of the VIED products on mostly
FLH models.Everyone up here in Northern Canada that has one installed is very happy with the new found performance.
Thanks to the crew at DK Customs. (Posted on 12/6/2021)
It actually does everything they claim it does Review by Best $140 I ever spent!
Installed them using the recommended setting (50%) on my 2008 XL Nightster 1200 after a Stage 1 upgrade that left the factory ECM settings out of balance causing poor (slow/weak) throttle response as well as sputtering, missing, surging conditions at cruising throttle in any gear. With just the VIED installation the bike came roaring back to life. Throttle response is immediate, power is restored in every gear, and cruising at part throttle is smooth and pleasant. Can't say enough good about this fine product. Get some, you'll see. (Posted on 10/12/2021)
It Works Review by Gene
Easy installation following the enclosed directions. Installed external breather system and 606 breather kit at the same time. The bike has come to life now. (Posted on 10/5/2021)
very pleased Review by Hangman
I'm very pleased with the product and the service I received. I have and will continue to recommend this product (Posted on 8/8/2021)
10 stars Review by Old fat bob man
I love the products I have purchased from these dudes. My wires that I nicknamed liar wires are working as advertised. The catch can is beautiful and works awesome. My external breather system has made a difference in my bike as well. I recommend these cats for your performance upgrades for sure. Keep rocking the cool stuff DK customs. (Posted on 7/7/2021)
Gr8 stuff,Gr8 peeps Review by Rawg
I have dealt with DK custom for many years. I have a lot of their products on my bike.
It is refreshing to deal with a company that knows what they’re doing and why.
Also top-notch customer service.
Keep up the good work (Posted on 6/28/2021)
Awesome product Review by Dave
Not looking for a high HP speed machine. Pipes, air cleaner, and stage one time on a 07 Fxstc. Bike was not smooth for low speed/rpm cruising. I was even thinking of gearing it down. Put the vied on and the change was instant. No more low speed chugging and had a good amount of low end pull that it never had. It is like a whole new bike! So just ordered a second one for another bike! Awesome product without spending a ton of money. Also the bike runs 50 to 60 degrees cooler on the head temps. Added bonus. (Posted on 6/9/2021)
More responsive Review by TALLELF
No dyno done.. but i can tell with these and my 828 air filter the lag and flatspot on the low end is gone.
It's at the recommended 50% for a sportster with stock exhaust. May tone it back a notch since it's not free flowing but feels better and more responsive (Posted on 3/22/2021)
Great Review by Festus
I can tell from response on 50% setting a vast improvement. On my second tank of fuel and ready to try next setting. No problems with codes (Posted on 8/8/2019)
Works great Review by Kbetts
I was concerned about engine heat and running 87 Octane in my 2008 Sportster 1200C when premium wasn't available (happened last month). I had a stumble at neutral throttle positions as well. I don't want to tune my bike, I just want it to run well (and cool). The ViED are simple to install and they are effective at getting rid of stumble, decell pop, and lowering engine temperature. I'm sure they aren't a cure for the EPA mandated factory lean condition, but they help a lot and are affordable. DK Customs provided fast service and good prices. Thanks, guys. Safe riding. (Posted on 5/30/2019)
fantastic Review by wayne
great product and even better service ...we installed this on a 2008 FLHTC and customer is VERY happy ...cheers from AREA 51 customs in Canada
(Posted on 5/23/2019)
Nice product Review by Jim
I installed a set of these on an 09 dyna with open intake and exhaust. Product performs as advertised. It richened the fuel/air mix and my bike runs cooler and stronger with overall better performance. I feel certain a real tuner could do better but not for the price. Most inexpensive, legitimate way get more fuel when running an open intake and exhaust! (Posted on 8/17/2018)

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