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Vehicle Info NeededX-Series Inline Wideband UEGO AFR (O2) Controller
Ships on 11/02/2026
Lowest Price GuaranteeFeatures:
- Fastest responding wideband air/fuel ratio controller in an independent test against 17 competitors
- Patented X-Digital technology (Patent 9,575,030)
- Includes Bosch 4.9LSU wideband UEGO sensor
- Factory calibrated resistor does not require calibration, but allows for free-air calibration as sensor ages if user desires
- Compatible with system voltages up to 16 volts
- 0-5 volt & RS232 output for data logging and feedback control, AEMnet (CANbus) for data logging and daisy-chaining multiple controllers up to 16 cylinders
- Weather-resistant, low profile design
AEM's legendary Wideband O2 Air/Fuel UEGO Gauge unites unsurpassed accuracy, speed and control with an easy to read, digital interface. This gauge-type 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. All AEM digital gauges feature a 0-5v analog output for use with data loggers and virtually any engine management system, such as the AEM EMS or FIC.
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FAST, ACCURATE AIR/FUEL DATA: AEM's world famous Wideband O2 UEGO Gauge is a must for anyone looking to maximize engine power and safety. When tuning an engine, accurate Air/Fuel Ratio data is critical. Running rich can cause a loss in power, while running too lean may result in serious engine damage. The AEM Wideband O2 UEGO Gauge features large LED numerals which enable the user to see when there's even a .1 change in ratio, providing time to shut things down before damage occurs. Each gauge comes with interchangeable black and silver bezels and black and white gauge faceplates for multiple color combinations.
The Bosch 4.9LSU sensor, which gives the controller its speed and accuracy, is laboratory calibrated at the factory and never requires free air calibration when used with an AEM Controller!
Features:
- No free air calibration required - ever
- Ideal AFR monitoring tool for EFI and carbureted applications, and engine dynamometers
- Accurate to .1 AFR
- Includes white and black gauge faces
- Includes black and silver interchangeable bezels
- Does not oscillate AFR reading like narrow band sensors
- Includes Bosch 4.9LSU sensor for optimum accuracy and reliability
- 0-5v analog output included for use with data loggers and virtually any engine management system
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