Free DHTML scripts provided by
Dynamic Drive

*shipping not included *prices in $CAD

PLX Devices


M-300 Tuner Edition Wideband Controller


The M-300TE (Tuner Edition) has 100% of the same features as the SM-AFR with a built-in 4 digit display. It is fully compatible with other PLX iMFD gauges and can be daisy-chained with other sensor modules.

Fuel Select (Gasoline, Diesel, E85, Methanol, Ethanol, CNG, LPG, Lambda Mode)

The M-Series Wideband Oxygen Sensor Controllers are extremely simple to use and to setup. They do not require complicated sensor calibration procedures nor do they require any confusing software setup. Simply, connect the power wires to a 12V source, snap the sensor wire harness with the oxygen sensor and you're ready to start measuring your automobile's air/fuel ratio within minutes! PLX Devices widebands are guaranteed accurate to 0.1AFR with race proven technology which yields extremely fast reaction times.

The M-300 Controller come with two analog outputs, linear wideband and narrowband. Our linear wideband output gives you the freedom to interface with a number of tuning devices, such as data loggers, piggy back fuel systems and stand alone engine management systems. The linear wideband output signal updates at 100KHz (100,000 times/sec). This signal can be sampled as fast as 50KHz. With the narrowband output you are able to completely replace your stock narrowband sensor and "feed" our analog signal directly into your ECU. This eliminates the hassle of welding a second sensor bung on your down pipe. Your ECU will "think" that your narrowband sensor is still there while you're measuring wideband information at the same time!

The M-300 continuously updates the corresponding air/fuel ratio 10 times per second (10Hz) on its integrated 4 digit digital display. If the air/fuel ratio is measured below 10:1, the LED displays "rich," and if the air/fuel ratio is measured above 20:1, the LED displays "lean". The LED display is visible even in bright sunlight conditions.

  • Works with standalone engine management systems.
  • Accurate Air/Fuel Ratio <0.1, Fast Reaction
  • Advanced Sensor Self Calibration Circuitry. No manual calibration required.
  • Wideband LINEAR Analog Output (0-5V)
  • Narrowband Analog Output (0-1V)
  • Replace your stock Narrowband sensor.
  • 32 MHz Advanced DSP Technology
  • Built in Resettable Fuse (No external fuse needed)
  • Sensor soft start circuitry, prolongs o2 sensor life.
  • Compact and Professional Design
  • "Plug and Play" Installation
  • ISO 9002 Certified Assembly

Wideband Controller Technology

Tech Article: PLX Critical Response Wideband Technology

The race proven M-Series wideband controllers utilize 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.

M-300 Tuner Edition Wideband Controller (M-300)..... $315.00 USD
M-300 Tuner Edition Wideband Controller (M-300)..... $360.61 CAD

More Info / Ordering