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Wide Band EFIEs

These devices are used for wide band sensors. They should be used on all 5-wire and 4-wire wide band oxygen sensors. Wide band sensors are sometimes called AFR (Air/Fuel Ratio) sensors.  The packages in this section include narrow band EFIEs for use on the downstream sensors.  So far, all vehicles we have encountered, that use wide band sensors, only use them upstream of the catalytic converter.  Narrow band sensors are used downstream.  We strongly recommend treating all of your sensors for best results.

Wideband Quad EFIE

Wideband Quad EFIE

This is the EFIE for V6 and V8 engines that are equipped with wide band oxygen sensors. Note: Vehicles that use wide band sensors, only use them...

$99.00

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Wideband Dual EFIE

Wideband Dual EFIE

This is the EFIE for 4 cylinder engines that are equipped with wide band oxygen sensors, or any vehicle with one wide band and one narrow band...

$79.00

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Legacy Dual Wide Band EFIE Basic (Close Out Sale)

Legacy Dual Wide Band EFIE Basic (Close Out Sale)

On Sale!  Originally sold for $79. This item has been discontinued and when existing stock is gone, they will not be reproduced. This is...

$45.00

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