PLX SM-AFR Wideband O2 Air Fuel Ratio Sensor Module

plx-sm-afr - PLX SM-AFR Wideband O2 Air Fuel Ratio Sensor Module

Item #:plx-sm-afr
Price: $199.99

SM-AFR iMFD Sensor Module - Wideband O2 Air Fuel Ratio Digital Wideband Air/Fuel Sensor

DESCRIPTION: SM-AFR accurately measures the precise wideband air fuel ratio (AFR) of any internal combustion engine. Up to 32 SM-AFR modules can be daisy chained together in the iMFD system. SM-AFR can also be used as a stand alone unit capable of interfacing with 3rd party hardware. All Sensor Modules are housed in high quality extruded aluminum designed to operate even in the most extreme conditions. In addition, all SM modules offer outstanding digital accuracy, response and resolution which far exceeds that of a standard gauge. Works with gasoline, bio diesel, ethanol, methanol, E85, LPG, and CNG.


Introduction to the SM-AFR

  1. Connects to 12V-18V power source.

  2. Analog outputs (0-5V linear wideband output, 0-1V narrowband output, ground)

  3. Termination jumper. Closed for first SM in daisy chain.

  4. Connects to next SM in daisy chain or to first DM

  5. Connects to previous SM or unconnected if first SM in daisy chain

  6. Connects to O2 Sensor Harness then to Bosch sensor.



SM-AFR utilizes the latest digital PID and DSP technologies to maximize o2 sensor reaction time and accuracy without compromising overshoot, and slow settling response time. This technology is coupled with advanced self sensor calibration circuitry and sensor soft start to both prolong the life of your oxygen sensor as well as eliminating any user intervention for manual sensor calibration. PLX widebands may be used and installed in your vehicle permanently.


Technical Article: PLX Critical Response Technology


  1. Wideband 0-5V analog linear output

  2. Narrowband 0-1V analog output Replace your stock narrowband sensor

(Click to enlarge)


  1. SM-AFR main unit

  2. Bosch LSU 4.2 wideband sensor

  3. O2 sensor harness 10ft

  4. 4ft power wire with 2.1mm connector

  5. 4ft Analog wires and connector with 4 terminals

  6. 1ft Serial Cable

  7. Termination jumper

  8. Quick start guide


The DM-5 AFR is an optional standard 52mm gauge designed to display the measured value from the SM-AFR module. More info


Physical Dimensions 2" x 2.875" x 1.125" (52mm x 75mm x 28mm) L x W x H
Technology PLX Critical Response Technology, Fast Response PID
Accuracy < 0.1AFR (Gasoline) Wideband, < 0.2AFR (Gasoline) Narrowband
Measurement Range 10-20AFR, 0.68 lambda - 1.36 lambda
Analog Outputs Wideband Linear 0-5V, Narrowband 0-1V (Driving Current 20mA)
Operating Voltage 8V-18V
Power Consumption 30 Watts (Max), 18 Watts (Typical)
Power Supply Technology High Efficiency Switching
Operating Temperature 0 - 85 Deg C
Sensor One Bosch LSU 4.2
Enclosure Extruded Aluminum

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