AEM Widebands

AEM Wideband UEGO Controller 30-4110

Digital Wideband Air / Fuel Gauge

A wideband UEGO sensor controller accurately monitors Air/Fuel ratios (AFR) during the tuning process to prevent a lean fuel mixture, which could lead to engine damage. AEM has combined its single-channel wideband UEGO controller and gauge display into one unit, uniting unsurpassed AFR accuracy and control with an easy-to-read interface. AEM’s Gauge-Type Wideband UEGO Controller features a digital LED display and sweeping LED “needle” that changes colors as AFR changes from rich to lean. The unit’s 52mm (2-1/16”) gauge housing fits in most gauge pods and can be remotely mounted virtually anywhere.

Ideal AFR monitoring tool for EFI and carbureted applications, and engine dynamometers

Does not oscillate AFR reading like narrow band sensors

No laptop required for monitoring!

Bosch sensor included

Accurate to 0.1 AFR

Reads in AFR or Lambda via a switch in back of gauge housing

24 Color-coded LED display lights provide immediate reference to engine’s air/fuel ratio (AFR) or Lambda ratio

Integrated three-digit display reveals AFR or Lambda in real time

User-programmable 0-5v analog output included for use with data loggers and virtually any engine management system

Serial data stream included for output of AFR (RS 232)

Price: $329.44
Sale Price $243.00
AEM X-Series Wideband 30-0300


  • X-Series Wideband UEGO AFR Controller Gauge were fastest responding wideband air/fuel ratio controllers in an independent test vs. 17 competitor wideband AFR controllers

  • Includes Bosch 4.9LSU wideband UEGO sensor

  • Factory calibrated resistor does not require free-air calibration, but technology allows for free-air calibration as sensor ages if user desires

  • Compatible with vehicle/system voltages up to 16V

  • 0-5V & RS232 output for data logging and feedback control, AEMnet (CANbus) for data logging and daisy-chaining multiple controllers up to 16 cylinders

  • Can display AFR values in hundredths of %

  • 52mm gauge diameter and slim 0.825” gauge depth

  • Gauge cup depth only .200” deep!

  • Auto dimming feature

  • User configurable display via buttons on the gauge face for changing AFR values, Lambda and O2%, and 3- or 4-digit display

  • Black bezel and black dual faced faceplate included (gauge only, silver bezel/white gauge option sold separately, PN 30-0300-ACC)

  • Locking connectors

Price: $263.80
Sale Price $211.00
AEM Wideband UEGO Replacement Sensor 30-2001

This kit includes a Bosch 4.2LSU sensor for use with any AEM Wideband UEGO Controller or Gauge.

The Bosch 4.2LSU sensor, which gives AEM Wideband controllers their speed and accuracy, is laboratory calibrated at the factory and never requires free air calibration when used with an AEM controller!


  • No free air calibration required - ever
  • Accurate to 0.1 AFR 


Price: $130.64
Sale Price $104.00
O2 Sesnor Bung
O2 Sensor Bung and Plug Set

Standard Oxygen Sensor Weld Bung made of T304 Stainless Steel and Threaded Hex Bolt for Plugging O2 Sensor Bungs made of Zinc Plated Mild Steel. Both are M18 x 1.5 Thread. Perfect for adding a Wideband downstream in the exhaust.

Price: $15.00
Sale Price $10.00
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