The M300 is an economical solution to all your WIDE-BAND 02 SENSOR (WB02) needs.  10 years ago, the cost of a WB02 solution was well in excess of $1,000.  With advancements in technology, the cost of owning a WB02 solution has dropped significantly.  If you have a modified vehicle, the first indication of problem is usually an erratic AFR - and there is no longer a reason why you should not have a WB02 system. 

The M300 Employs the use of the advanced Bosch LSU4/4.2 heated oxygen sensor, the PLX M300 allows the user to accurately determine the air-fuel ratio (AFR) of your vehicle.  Monitoring and calibrating the AFR of any high performance vehicle is critical for proper vehicle operation, maximum power, and longevity of the engine.  The number one cause of "tuned" engine failures is the improper calibration of AFR's.  Unlike the competition which uses cheap narrow-band sensors (or the factory narrow-band sensor) to intercept AFR's, the M300 with its advanced circuitry controls a heated wideband 02 sensor which allows wider and rapid AFR readings.  The PLX M300 features 0-5v wideband output, 0-1v narrowband output, <0.1 AFR sensitivity, rapid response, 32mhz DSP technology, and "soft start" circuitry to prolong sensor life.  The kit includes all circuitry, LED display, and Bosch LSU sensor.  VIDEO DEMO


Description Part # Picture   Our Price
PLX M300 Wideband 02 Kit (Free Shipping) PLX-M300 Click   $299.00
52mm WB02 Gauge (white) PLX-AF-WGAGE Click   $119.00
52mm WB02 Gauge (Black) PLX-AF-BGAGE Click   $119.00



The M333 is an 52mm gauge solution to all your WIDE-BAND 02 SENSOR (WB02) needs.  10 years ago, the cost of a WB02 solution was well in excess of $1,000.  With advancements in technology, the cost of owning a WB02 solution has dropped significantly.  If you have a modified vehicle, the first indication of problem is usually an erratic AFR - and there is no longer a reason why you should not have a WB02 system. 

The M333 Employs the use of the advanced Bosch LSU4/4.2 heated oxygen sensor, the PLX M333 allows the user to accurately determine the air-fuel ratio (AFR) of your vehicle.  Monitoring and calibrating the AFR of any high performance vehicle is critical for proper vehicle operation, maximum power, and longevity of the engine.  The number one cause of "tuned" engine failures is the improper calibration of AFR's.  Unlike the competition which uses cheap narrow-band sensors (or the factory narrow-band sensor) to intercept AFR's, the M333 with its advanced circuitry controls a heated wideband 02 sensor which allows wider and rapid AFR readings.  Unlike the M300, the M333 moves the digital display directly to a 52mm gauge. The PLX M333 features 0-5v wideband output, 0-1v narrowband output, <0.1 AFR sensitivity, rapid response, 32mhz DSP technology, and "soft start" circuitry to prolong sensor life.  The kit includes all circuitry, 52mm WB02 gauge, and Bosch LSU sensor. 


Description Part #     Our Price
PLX M333 WB02 Kit w/gauge (Free Shipping) PLX-M333     $325.00



The R-300 is a compact, dash mountable, easy to use WIDE-BAND 02 SENSOR (WB02)  controller with powerful data logging capabilities. 10 years ago, the cost of a WB02 solution was well in excess of $1,000.  With advancements in technology, the cost of owning a WB02 solution has dropped significantly.  If you have a modified vehicle, the first indication of problem is usually an erratic AFR - and there is no longer a reason why you should not have a WB02 system. 

The R-300 features numeric WB02 monitoring in gauge or graphical form. On-board data logger inputs can be fully customized to display virtually ANY type of data.  The R-300 can store up to 90 minutes of logged data and 99 individual sessions for later PC download and analysis with PLX Logger PC software.  Features include WB02 monitoring with the use of the Bosch LSU4/4.2 sensor, integrated 6-input data logging (2x speed, 3x analog, 1x AFR), led warning (such as shiftlight).  The it includes all circuitry, PC Software, and Bosch LSU sensor. DOWNLOAD SOFTWARE


Description Part #     Our Price
PLX R300 WB02 Kit (Free Shipping) PLX-R300     $449.00

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