The air to fuel ratio is something your OBDII-equipped ride already has a reading on. Why go overboard to translate that information to a gauge? With the AEM X-Series OBDII Wideband AFR Controller Gauge, tuners can view AFR through the factory ECU CAN-bus stream, ensuring an accurate, safe and powerful tune.

Adding an AFR gauge to the mix is the best way to monitor exactly what air to fuel ratio the engine has to work with at any given moment. This single piece of information is perhaps more definitive of performance than anything else. That doesn’t mean you need to go overboard to get the data, though. This AEM X-Series OBDII Wideband AFR Controller Gauge makes use of what the vehicle already has to work with, meaning you don’t need to do away with factory-installed sensors. The X-Series Wideband AFR OBDII Gauge includes an OBDII pass-through, which provides accurate AFR readings right through the factory ECU CAN-bus – ideal for tuners who are using piggyback tuning modules or open source software.
Thanks to AEM Electronics’ patented X-Digital wideband technology, X-Series Widebands are the fastest responding wideband air/fuel ratio controllers in independent testing against 17 other wideband UEGO air/fuel controllers. High-speed readings ensure no loss of signal fidelity and full transient response, making the controller able to identify the slightest fluctuations in AFR and output them in full value.

Powerful, cost-effective tuning tool accurately monitors engine air/fuel ratio
Patented X-Digital Wideband Technology ensures high-speed readings for precise tune
OBDII pass-through provides AFR readings through the factory ECU CAN-bus
Use the factory 02 calibration or free-air calibrate using buttons on faceplate
Compatible with vehicle/system voltages up to 16V
Optional outputs for 0-5V & RS232 for data logging and feedback control (requires wiring)
Can display AFR values in hundredths of %
2-1/16″ gauge diameter and slim 0.825″ gauge depth
Black bezel and black faceplate
Auto-dimming sensor delivers ideal display brightness
User configurable display for changing AFR values, Lambda and O2%, and 3- or 4-digit display
Locking connectors
Limited 1-year warranty

Specifications