O2 Sensor Enhancer

EFIE stands for Electronic Fuel Injection Enhancer.

When we add HHO gas to our engines to burn our fuel more efficiently, by increasing combustion, we are adding more oxygen in to the air/fuel mixture.

This changes the exhaust gases and tells the computer through the oxygen sensors something is not right. The computer will try to adjust the air/fuel ratio by adding more fuel.

The Electronic Fuel Injection Enhancer then goes to work to resolve this, by altering the signal to the computer through the oxygen (O2) sensors, so the computer will be content with its readings.

Which O2 Sensor Enhancer Is Right For My Car?

Essentially There Are 2 Types Of Auto Oxygen Sensors;
Narrow Band And Wide Band

  • If your vehicle is pre 1997 then it is a narrow band.
  • If it is an American car, then it is a narrow band (a few 2009's are wide band).
  • Japanese or German vehicles built after 2000 is most likely a wide band.
  • If you have 4 wires (and it is not a Toyota) it is a narrow band.
  • Toyotas have 4 wires and they are wide band.
  • If the sensor has more than 4 wires it is a wide band . So 5 and 6 wires are wide band.
  • Most diesels will not have O2 sensors, however a few do.

* Look for a sticker underneath your hood with technical data about your vehicle. If you have wide band oxygen sensors, which may be called AFR (Air/Fuel Ratio) sensor, they are noted on these stickers.

How Many Oxygen Sensors Do I Have?

V-6, V-8 and larger will usually have 2 auto oxygen sensors that are upstream of the catalytic converter, one on each exhaust manifold. Vehicles with 4 cylinder engines usually have 1 upstream sensor. You may find a configuration that varies from these.

Not Sure Which O2 Sensor Enhancer You Need?

It can get confusing. If you are not sure which one is right for your vehicle, the past requests at the bottom of this page may help. You may find your vehicle information there or help to assure you which one is needed. If you are still unsure feel free to contact us.

All HHO oxygen sensor enhancers come with great instructions. Once you get it dialed in, thats it, you will not have to adjust it after that.

Encased in epoxy for protection and mounting tabs for easy installation. A terminal block for connections to the oxygen sensors and for power and ground.

An LED light to show you when the unit is on. When the O2 enhancer is not "on" it goes back to factory setting.

These units have a start up delay of about 50 seconds. For the first 25 seconds after power up, there will be no change to the sensor's signal. After approximately 25 seconds the unit will start ramping up to it's set point. At 50 secs it will reach it's full adjustment to the sensor's signal, and will stay at this setting unless the pot it adjusted, or the power is turned off. This postponement is deliberate so that the fuel mix will be richer during engine start up.

Extremely accurate with a signal drift of less than one percent across it's entire operating temperature range, which is -40 to 275 Degrees Fahrenheit or -40 to 125 Celsius.

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Digital EFIE For Narrow Band Oxygen Sensors

We recommend Digital Electronic Fuel Enhancers for all narrow band oxygen sensors. These new digital enhancers allow much leaner settings than other O2 enhancers.

  • Can make the air/fuel mix much leaner than earlier designs. With this device you can lug down your engine, and often kill it if you set it too lean.
  • Absolutely rock steady adjustment no matter what temperature the environment. Will vary less than 1/2 of 1% over it's rated temperature range of -40 to 125 Centigrade.
  • One adjustment pot modifies both upstream (Digital) O2 Enhancers equally, and similarly, one pot adjusts both downstream (Analog) O2 Enhancers. This makes these devices easier to set.

Quad Digital EFIE Basic
Narrow Band

This unit is recommended for almost all American cars, foreign cars older than 1997 and most foreign cars after 1997. Quad Digital EFIE It will be the right one for ninety percent of all vehicles.

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Dual Digital EFIE
Narrow Band

These should be used for oxygen sensors that are upstream of the catalytic convertor. Digital EFIE Deluxe If you need to treat down stream oxygen sensors please purchase the Quad Digital Enhancer above.

For 4 cylinder engines and for any other engines that may have 1 sensor up stream like some 6 and 8 cylinder engines.

This model has one digital one analog electronic fuel injection enhancer. The analog should be used for your downstream sensor.

With one pair of potentiometers that controls the wide band, and another pair of pots for controlling the narrow band.

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Digital EFIE For Wide Band Oxygen Sensors

Wide Band Quad EFIE Wide Band Quad EFIE

For 6 and 8 cylinder engines that have wide band oxygen sensors. Vehicles that have wide band oxygen sensors, only use them upstream of the catalytic converter. The downstream sensors will still be narrow band. This digital EFIE has 2 wide band and 2 narrow band EFIEs.

It has one potentiometer that controls the 2 wide band and another pot for controlling the 2 narrow band.

It will work with all types of wide band and AFR (Air/Fuel Ratio) sensors. It is the EFIE to choose for four and five wire oxygen sensors. Also note there is a variation of the 5-wire sensor that uses 6 wires. This device will work with these also.

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Wide Band Dual EFIE Dual Wide Band EFIE

This is the O2 Sensor Enhancer for 4 cylinder engines that are equipped with wide band oxygen sensors, or any vehicle with one wide band and one narrow band sensor. Note: Vehicles that use wide band sensors, only use them upstream of the catalytic converter. The downstream sensors will still be narrow band. Therefore this product has a wide band and a narrow band EFIE.

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Past EFIE Requests

2008 Chevy Silverado 1500 lt 
5.3l engine fwd extended cab

2008 FJ Cruiser 
4.0L Engine Size

2001 Ford Explorer Sporttrac 
V6 4.0 SOHC. I have 3 o2 sensors, 2 pre-converter and 1 poat. Do I need controllers for all sensors? I am adding HHO and do not want to burn up the converter …

1990 Chevy K-1500 Silverado 
5.7 liter How many o2 sensors do I have?

2001 Ford Ranger  
4.0 sohc How many o2 sensors and what type

2009 Chevy Malibu 
2.4 liter 4 cylinder

My motor is a 2,2L Diesel an it has a OBD II Plug in the fuse box. What EFIE do i have need? Thanks. Serge BRETONNIER

1993 Ford Aerostar 3.01 Engine 
1993 Ford Aerostar 3.01 Engine I built my own hho generator not seeing alot of mpg increase, want to try an EFIE for my oxygen sensors. The horsepower …

2001 Ford Ranger XLT  
4.0 liter sohc FWD

1992 Ford F150 
1992 f150 I6 4.9 how many o2 sensors are there on my truck

2010 Mazda3 MPS 
2.3 Diesel Turbo engine

2003 v8 Toyota Landcruiser fwd 4*7 liter4sensors 2 before 2afterh 
how do i purchase the correct efie and where

1996 Chevy Suburban 7.4 liter 
1996 Chevy Suburban 7.4 liter Thank you

2006 volvo s40 
2.4 liter year.2006 which EFIE do i need for my car?

1995 toyota 4 runner 
3.000 cc V6, 3VZ engine.

1998 Mitsubishi Montero / Pajero 3 Doors FWD 
Year: 1998 Make: Mitsubishi Model: Montero / Pajero Engine Size: 3.0 litre 6V I want to know what EFIEs apply for my car.

1989 Mercedes 300E 
m103 sohc 3.0 2997cc continuous fuel injection single turbo on 8 pounds of boost running on 91 octane looking for better power and fuel efficiency I am …

2009 kia rio lx 
1.6 ltr

1996 Subaru Outback 
2.5 liter California emissions Which oxygen sensor do i have? What are all my options for EFIE sensors? Thanks Dan

2002 Chevrolet Astro Van  
2002 Chevrolet Astro Van 4.3 liter

1990 AUDI 80/100 
2.0E, Ke - jetronic, 85kW petrol.


2000 Honda CRV 
2.0 i believe

2002 Chevy Suburban 
5.7 liter, i want to transform my truck to hho and i want to be as complete as possible can you help me to figure this out, i need list of parts and price …

1992 Chevrolet Caprice Classic  
5.0 Liter, Will I need a EFIE and a MAP Enhancer for the most efficiency? Do you supply both for this model of car?

1995 Nissan Pathfinder  
Hi, this Path Finder is the 3 liter v6 and I am looking for general advice on just what to do with adapting hho to this 3 ltr petrol guzzler...

2000 Toyota Tacoma 
3.4L V6 with two O2 sensors and both up stream from the cat converters thanks

2007 Volvo s40 
1800cc 2007 Vovlo s40

2008 "Toyota FJ Cruiser" 
4liters engine, FWD.

1989 plymouth voyager 
2.5 four cyl natural aspirated engine

2002 ford f-350 
7.3 diesel will this unit last a long time and will it increase my mileage and by how much ????

93 toyota pickup  
2wd with a 22RE engine which is the best efie for me? How many and where are the o2 sensors?

2002 ford pickup f350 4x4 
7.3 diesel auto

1994 Plymouth Voyager  
I have the V6 3L engine in my van I am not completely sure what type of sensor this vehicle need. What other equipment would this car need to run good …

1988 Ford Bronco 2 with a 2.9 L, V6 
I have only one oxygen sensor upstream just after y before cat none after cat. This is a California truck smog tag and unit do not need a EGR valve. I …

2004 Chevy Colorado  
3.5 I am looking for information that what size generator I would next (output) of hydrogen. I am also looking for information of what size water tank …

1998 Plymouth Grand Voyager 3.3 liter engine 
1998 Plymouth Grand Voyager 3.3 liter engine Thanks

RV4 1994 TOYOTA 
JAPAN RV4 MODLE E-SXAA1OG What is sensors for that car

1996 Dodge Intrepid 3.3 V6 
3.3L. With the enhancements, is ignition timing a problem? Is the warm-up time of the catalytic converter a problem. Can the system be configured to …

1996 Ford Windstar 
The engine size is 3.8L

ENGINE: 4.0 L V6 "FWD" My vehicle was purchased in California. What system,with enhancements, is best for my vehicle?

2004 Honda Odyssey 6 Cylinder 
2004 Honda Odyssey 6 Cylinder

1992 BMW 730i 
Hello, Which O2 Enhancer I need for my car. BMW M30 engine is strait six, 3 liter. Thanks! Karlis

1999 RV ford econoline 10 cylinder 6.8 l 
Hi Do I need a quad or double EFIE and what band Thanks

first yr Taurus 86,  
3.0L v-6- Chilton's has only O2 sensor listed, my online Mitchell's mentions only MAP. I have not raised it up look to closely enough to find out, but …

1992 z71 chevy silverado 
350 with 5.7L

2003 bmw 525d 
2500cc , 6cyl On which design or patent is your system based?

1986 Ford Taurus 
3.0 Liter v-6 I've found a procedure for conditioning generator plates, adjusting generator electrolyte concentration..but did not flag it and as I am …

5.9 liter V-8 magnum

1995 Ford Explorer 2DR Sport  
4.0L EFI V6, "FWD", Automatic I was at Auto Zone looking up oxygen sensors and it seemed to suggest I might have one down stream. Is that so?

1997 Volkswagen Golf CL 1.8L 
Car is 1.8L Please note that it is CL. This has proven to need different parts than the GL sometimes, in my experience. I would like verification that …

2005 Jeep Wranger With a 4 liter engine 
Does the efie go in the vehicle or under my hood?

2007 GMC Yukon SLE 5.3 liter 
Need the best one for my car.

2010 Honda Insight 
This vehicle has a 1.3 liter 4 cylinder engine, I believe, but you can double check. I've been told it has an air fuel sensor, or AFR upstream of the …

1985 Chevrolet G20 Sportvan 
V8 5.0 liter. My van has a carburetor setup, will I still need a EFIE unit and if so what would you recommend?


1400cc VW GOLF IV year 2000 and runs on gasoline as fuel 
Hello again, this is Johnny from Greece. I have checked my sensor and it has 6 cables,also there isn't any other sensor installed in car. My car as …

1996 Ford Ranger 3 liter 
Thank again guys!

2002 Ford E150, Basic, Cargo Van 
4,2L V6, I would like to know your recommendations for a complete HHO system. I am first having my 60,000 Mi Maintenance done, putting in performance …

NISSAN Murano 
V6 3.5ltr 2008 All wheel drive SUV, I'm not sure if this sells in the US under the same name. Which enhancer would suit this unit?

1999 Nissan Maxima 
Maxima :3.0L 2988CC V6 My check engine light is on and I was told I needed to replace the Oxygen sensor. The car idels rough and miss fires. I'm not …

1999 Toyota Camry 
2.4 liter

1998 Ford Ranger 3.0 liter 
Please tell which efie I need. I already have your MAP sensor enhancer, want to see if I can get a little more MPG with the efie. Thanks Again, …

1994 Ford F150 
4.9 6 cyl Thanks

1995 Toyota 4-Runner 
3.0 litre V6

2004 Toyota Rav 4 2.4 Liter 
It's a 2.4 liter engine. Your Revolution kit, how do you keep the bubbler and reservoir from freezing? - Charles C.

2007 Toyota Camry 2.4 Liter 
2007 Toyota Camry 2.4 Liter Can you tell me about the Volo Chip? What is the difference between using the EFIE and the MAP vs the Volo? Or do you …

2005 Dodge Durango 
Hemi 5.7L gas engine. I have installed a computer chip that alters air flow mixture..after about 100 miles, the check engine light comes on from the O2 …

2005 Toyota Camry SE 2.4 
Comments: 87 octane, 4 cylinder, 80k miles, 25 mpg (mixed driving). Looking for a complete kit. What is the conservative increase % in mpg? By the way …

2007 Honda Civic 1.8 Liter 
2007 Honda Civic 1.8 Liter On the label it says: TWC, A/F sensor, HO2S, EGR, SFI OBD II Certified. Is it Wide Band? What kind EFIE do I need? What …

2006 Toyaota Tundra 4.7 Liter V8 
2006 Toyaota Tundra 4.7 Liter V8 Looking for a duel map and efie to complete a hho unit that I am looking to purchase. Thanks for the help.

2001 Jeep Grand Cherokee 4.0 Liter V6 
2001 Jeep Grand Cherokee 4.0 Liter V6 Also interested in any other advice you could give to applying a setup to this vehicle. Currently averageing …

1994 Chevy S-10 Pickup 4.3 Liter 
1994 Chevy S-10 Pickup 4.3 Liter Thanks for your help with HHO system, you were the only company that answered the phone. Dick

2007 Chysler Pacifica 4.0 Liter 
2007 Chysler Pacifica 4.0 Liter What type efie is on my car? Are instructions included with products that you sell?

2008 Ford Escape V6 
2008 Ford Escape V6 What all components are need to make your system for this vehicle function the most efficient yet safest way? Thanks Mike

1992 Honda Accord 4 cylinder 
1992 Honda Accord 4 cylinder

1991 GMC Silverado Trcuk 350 Cubic Inches 
1991 GMC Silverado Trcuk 350 Cubic Inches

1998 Toyota Avalon V-6 
1998 Toyota Avalon V-6

1997 Pontiac Grand-Am 3.1 Liter 
1997 Pontiac Grand-Am 3.1 Liter Look forward to hear from you - Allen

1998 Dodge Ram 1500 
1998 Dodge Ram 1500 360 Please tell me what would be the best combo to install on this vehicle for maximum mileage gain.

1988 Nissan Pathfinder VG30 
1988 Nissan Pathfinder VG30 I will also need a MAP Sensor

2009 Subaru Forrestor 2.5 Liter 
2009 Subaru Forrestor 2.5 Liter

2000 Volkswagan Golf IV 
2000 Volkswagan Golf IV with 1400cc Johnny from Greece

2007 Chevy Uplander 3.9 Liter 
2007 Chevy Uplander 3.9 Liter

2004 Buick Regal 3.6 
2004 Buick Regal 3.6 liter engine Thanks Again

2006 Kia Rio 1.6L 
2006 Kia Rio 1.6L Thanks

2004 Jeep Wrangeler 6 
2004 Jeep Wrangeler 6 cylinder engine.

1994 Honda Prelude 2.0 Injection 
1994 Honda Prelude 2.0 Injection What countries do you ship to?

2003 Mercedes Vito 2.2 liter 
2003 Mercedes Vito 2.2 liter Thanks, Bill

2008 Mitsubishi Lancer GTS 2.0 Liter 
2008 Mitsubishi Lancer GTS 2.0 Liter cvt transmission

2005 Chevy 2500HD 
2005 Chevy 2500HD What hho kit would be best for my truck? engine is 6.0 liter

2001 Dodge 1500  
Engine 318

1997 Mazda 626 4 cylinder 
1997 Mazda 626 4 cylinder Thank You

2001 Ford f150 5.4 Triton 
2001 Ford f150 5.4 Triton I was told I have four o2 sensors two before the conv. and two after.is it true I only need to be concerned about the two …

1994 Jeep Grand Cherokee Larado 
inline 6 cyl my understanding is if you run your fuel mixture too lean you stand the chance of burning the pistons if this is true then how do you make …

1993 Chevy Caprice Classic  
Engine is a 305 Would the analog EFIE be suitable for this model?

2009 Hummer H3T 
Has a V8 5.3 liter engine. Thanks for your time, Brian

2000 Honda Odyssey V6 
2000 Honda Odyssey V6 Engine Size = 3.4L, V6

2003 Mitsubishi Eclipse V6 
2003 Mitsubishi Eclipse V6 3.0 liter engine Thanks

2000 Ford Windstar 
6 cylinder Engine Will this work with my car?

1994 GMC K1500  
1994 GMC K1500 4x4 6 cyl I already have your LED MAP Sensor Enhancer, ready to tune my o2's Thanks Again

2009 Toyota Rav4  
2009 Toyota Rav4 V6 3500

2009 Toyaota Coralla LE 
2009 Toyaota Coralla LE 1800

2008 Hyunday Accent  
2008 Hyunday Accent 1.6l engine

2008 Dodge 1500 Ram Truck 
2008 Dodge 1500 Ram Truck Engine size is 5.7 liter hemi. What efie is required and how to install Thanks, Clarence

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