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Quad Digital EFIE

Price: $99.00

The Latest Breakthrough in EFIE Technology.

About 90% of all vehicles need one of our 2 Digital EFIE Models. The only difference between them is the number of sensors they can handle. We recommend these models for virtually all American cars, all foreign cars older than 1997, and most foreign cars after 1997. In most cases, V-8 and V-6 engines require the Quad version as they have either 3 or 4 oxygen sensors.

If you are not sure what type of EFIE your car needs, then see this article: Which EFIE Do I Need?

Digital EFIEs allow much leaner settings on vehicles than other types of EFIE. We recommend Digital EFIEs for all narrow band oxygen sensors that are upstream of the catalytic converter. Note, that the Quad EFIE uses a pair of analog EFIEs for the downstream sensors (see the article in the link above to see why the downstream EFIEs need to be analog type).

For more information, see the article The New Digital EFIE: How It Works. Also see the Quad Digital EFIE Installation Instructions.

Digital EFIEs have the following benefits:

  1. Can make the air/fuel mix much leaner than earlier designs. With many cars you can lug down your engine, and even kill it if you set it too lean. Note: Some cars have preset fuel minimums that will not allow this to occur
  2. 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.
  3. Will work with older, "tired" oxygen sensors that should have been replaced. Other EFIE styles require these to be replaced. Mind you, if they are old, they should still be replaced because you will not get optimum fuel mileage with old sensors. But if they are working prior to your EFIE install, they will still work with this EFIE.
  4. One adjustment pot modifies both upstream (Digital) EFIEs equally, and similarly, one pot adjusts both downstream (Analog) EFIEs. This makes these devices easier to set.


Note: Some Dodge/Chrysler vehicles have been known to put 2.5 volts on the sensor's "sig low" wire. This raises the signal high wire by 2.5 volts. Our device works with these sensors too.


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  • Shipping Weight: 0.2lbs
  • 6 Units in Stock

This product was added to our catalog on Sunday 24 May, 2009.

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