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PLX Wideband O2 Sensor -Gen 4

We're proud to introduce our next generation wideband oxygen sensor controller with intelligent health monitoring technology and current for improved sensor performance. Our new Gen4 Wideband AFR utilizes the next generation in Bosch Wideband Air/Fuel Ratio sensor technology. The Gen4 is faster, more accurate, more durable, and uses less power than the Gen3. The Gen4 also employs the innovative PLX Devices new intelligent health monitoring technology where the oxygen sensor is meticulously monitored every 2mS (488 times per second) to obtain peak performance, accuracy and reaction time. Pair the SM/AFR with the updated patented DM-6 touch screen MultiGauge, battery voltage is displayed from 9V-20V, sensor life is displayed from 0-100%. The oxygen sensor reaction time is displayed from 10mS/1000mS on the brilliant high contrast OLED display.

The PLX Wideband AFR (UEGO) combines an accurate, fast response wideband AFR (Air Fuel Ratio) controller with a Bosch LSU 4.9 wideband oxygen sensor. The wideband controller (SM-AFR) works with gasoline, bio diesel, ethanol, methanol, E85, LPG, and CNG. It includes two analog outputs (wideband 0-5V, and narrowband 0-1V) for interfacing with 3rd party devices and one digital serial output for interfacing with the DM-6 gauge and other Multi Gauges. The wideband analog output is ideal for interfacing with aftermarket ECU's and data loggers. The narrowband output is ideal for stock narrowband oxygen sensor replacement where the simulated narrowband analog output is fed back into your ECU to make it operate as if the stock narrowband oxygen sensor is still installed while running the PLX wideband setup. All three outputs can be used simultaneously. Additional features include advanced soft start technology which prolongs the oxygen sensor's life and an aluminum enclosure for durability and reliability.

Gen 3 vs. Gen 4

  • More accurate
  • Uses only 7.5 Watts compared to 10 Watts
  • Faster response time
  • Improved sensor durability
  • Faster warmup time
  • Maintains accuracy throughout life
  • Less susceptible to contamination to surrounding pollution
  • 10+ years of average service life


  • New Sensor: Bosch LSU 4.9
  • New Sensor: O2 Sensor Health
  • New Sensor: O2 Sensor Reaction Time
  • New Sensor: Voltage
  • No Calibration required
  • Soft start technology
  • 2 analog outputs
  • 1 digital input, 1 digital output
  • Compatible with multiple fuels
  • Sensor is hand tested
  • Digital precision
Customer Reviews
5.0 Based on 10 Reviews
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  • intake air temperature
  • signal
  • Hondata
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Hillard t.
United States United States

I bought it to replace the one I already have. Hooked it up and everything is good again except the intake air temperature is fluctuating when the engine is running. Which was happening with the old setup also but I'm happy with it and I just have to find out why.

Phillip M.
United States United States

Plx WideBand

Great business and product!

David A.
United States United States

Great Product, Fast Shipping

PLX wideband is great, works well, easy to install and has a simulated narrowband signal to send to the ECU. Prevented me from having to add another **** to the exhaust. Great product with fast shipping.

Matthew S.
United States United States

Plx 100%

Great product to use with Hondata

Lee S.

Great Wideband

very cool wish i would have bought one sooner.