Volo FS2/FS3 - OBD II plug

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The Volo FS2 HHO Edition / FS3 Fuel Saver with OBD II PLUG Only $120.00

Comes with OBDII plug. You only have to solder 2 wires. Instruction booklet is here.

More photos of the OBD II port plug.

This FS2 chip has been specifically tuned for the  HHO generator equipped vehicles and or Buddy's Fuel Vaporizer. Or no HHO added as well. The FS2 is dynamic - which means the FS2 will consider oxygen levels in the exhaust, along with engine speed and load, intake air temperature and volume, and many other variables to determine the most efficient fuel delivery rate and timing at up to 256 separate load points.


Today the FS2/HHO Edition and the FS3 ( no HHO or Fuel Vaporizer) are both the same circuit. Up to you, it you want to try out Hydroxy Gas™ (our 4x more powerful form of HHO gas, invented by a Dr. of AeroSpace Engineering : Bob Boyce™


When using HHO as a fuel supplement, the FS2 will adjust fuel delivery and timing to optimize efficiency. One year warranty.


When HHO is disabled, the FS2 will automatically re-adjust and switch to highly efficient, non-HHO enhanced maps. Just push the reset button, to re-calibrate the Volo circuit. Can be pushed at any time, while stopped, hot and idiling. Takes about 2 minutes to calibrate, wait till it is done and 2 green solid lights are displayed in the blue box.


The FS2 is a vehicle specific, custom programmed 20MHz Microcontroller. It utilizes its high speed serial input/output to communicate directly with the ECU through the OBD-II port.


Guaranteed to work or your money back!  This circuit works by an exclusive process of "Dynamic Soft-Flashing" the ECU. The new FS2- HHO Edition was specially designed to SAVE MPG with or with out the addition of Hydroxy® Gas from a HHO booster cell system. Ships in 1 to 2 days. WIll work on 98% of all cars or trucks. Will not work opn hybrids and semi trucks, except Volvo.  The next closet gas saving micro processor chip is $900! For only $95.00, the Volo FS2 circuit should be way more money$!

Save money at the pump! Pays for itself in 3 to 6 months. Only $95.00 No other fuel saving circuit on the market, as smart as the Volo Fs2 compares to this low price offer. The closest micro processor gas saver to the is $900+

How does it work?

The Volo FS2 & FS3 Chip works by an exclusive process of Dynamic Soft-Flashing the ECU, onto it's own micro processor chip. Each circuit comes programmed with a highly tuned map and a set of EPROM addresses that directly affect fuel efficiency. When the ECU attempts to read the specific EPROM address, the Volo Chip patches the factory value with one from its tuned map. Built on the same platform as our popular VP12, the FS2 utilizes the same exclusive patching algorithms to increase fuel efficiency across the map by up to approx. 10% to 18%.

ATTENTION INTERNATIONAL CUSTOMERS : Please verify your vehicle is OBD-II compliant before making a purchase. (1996 - 2022) E-mail us.

HHO enthusiasts swear by our time tested FS1. After the recent 7.0 patch, we've come close to the limitations of the FS1's hardware. So we've taken your feedback and suggestions, along with the powerful VP12 hardware, to build the newest in the Volo line up - The FS2-HHO Edition!

Learn about all the scam resistor chips here.

Don't want to bother with a Hydrogen Generator? but still want to save gas, Volo makes a FS3 chip.

Recommended modifications :

- K&N or equivalent non-restrictive intake, but with adding HHO to air filter box, the stock air filter box is recommended. The cone shapd air filters are no good with HHO installs, unless the K&N has a long tube before their air filter, as to let the HHO gas mix with the incoming air. Our Static cling spin state of HHO has to mix with the incoming air, before hitting the intake manifold. The more mixing the better!

- HHO (Hydroxy® Gas) Supplement Generator for maximum gains. Beware of Junk HHO cells out there. We can prove that our cells will produce a good 80% of "ortho" hydrogen, a necessary static cling gas to carbon. Without this higher quality gas that clings to carbon,  you will NOT see consistant MPG gains! Please read here. - Buddy's Fuel Vaporizer.

The FS2 is compatible with factory equipped Turbo/Superchargers, diesel engines, Flex-Fuel, & HHO supplement systems. It is NOT compatible with hybrid engine options, propane, or natural-gas.

We need your Year, Make, Model, Liter size engine information for the programming of your specific car or truck

The FS2 has room for up to 8 performance maps, which we use to cover different engine options for a particular vehicle. For example, the 1999 Ford Mustang Volo Chip will be compatible with both the 3.8L V6 and the 4.6L V8. The FS2 will read the first few bytes of data from your ECU during calibration to determine which map to use.


We need your car info in order for us to custom fit to your car or truck's Protocol. A photo of your OBDII port, will help us see the polulated pins. See here.



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This product was added to our catalog on Tuesday 08 November, 2022.

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