Build it Yourself! Easy to add upgrades as per the EFIE Manual.

This circuit board and components are identical to our fully assembled EFIE Device.

The EFIE Kit Assembly, Installation and Operation instructions do not come with the kit.  They are available as a download from the EFIE Resources.  

You get automatic access privileges to the EFIE resources by buying an EFIE Device or this Kit.  You log into the Resources through your account.

The EFIE connects directly to your oxygen sensor and is compatible with ALL oxygen sensors. You need one on each oxygen sensor mounted before the Catalytic Converter.

The EFIE allows you to retain all your power and performance while taking advantage of increased mileage. No matter what fuel saver device or method you use on your fuel injected vehicle, you'll need the EFIE to unleash the full potential of the fuel saver.

The EFIE alone can save 5% - 10% on your fuel bill, simply by 'leaning' your fuel mixture. We do not consider it as a fuel saver on it's own. It is designed as an ASSIST for fuel savers.

SKU ER1-K1-0050 • 0.4166 lb / 189 gm

ISBN 1-895882-32-X • 8.5 x 11

Important Notes:
Regardless of what you read elsewhere, we have discovered that the EFIE works on ALL types of oxygen sensors, including Titania (varying resistance) sensors, A/F sensors and wideband sensors.

We do not make an EFIE that controls more than one oxygen sensor. Since nearly every component on the circuit would need to be duplicated anyway, it makes no sense (to us) to stock two different versions of the same circuit. One EFIE per oxygen sensor also allows the customer flexibility during installation.