| Updated price, only $225 shipped Priority, make offers otherwise I have a PLX M300 that I am not going to need anytime in the near future. This piece has been used for less than 10k Miles and works perfectly fine. I would like to get $225 shipped via Priority. These retail for $315 and shipping. I do not have the instruction manual that comes with it, but it only has a few wires. Power, ground and output wire signal Here are the pics, email me at aztec300zx@yahoo.com for any questions. I am a longterm member of both TT.net and 3ZC.com and can provide references. 
Key Features:
* Works with standalone engine management systems. More Info
* Accurate Air/Fuel Ratio <0.1, Fast Reaction More Info
* 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. More Info
* 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
Description:
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. CLICK TO ENLARGE
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. Wideband Controller Technology:Tech Article: PLX Critical Response Wideband Technology Our 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. Bosch LSU4/LSU4.2 Sensor Info: This sensor is more commercially available than the NTK and is used in production cars such as, Porche, Audi, VW, Subaru, Cadillac, and Volvo. Its performance, accuracy and cost make it the ideal sensor for today's tuning needs. Technology: M-300 Technical Specifications
What's included in the kit?:
1. M-Series Wideband Oxygen Sensor Controller unit.
2. Bosch wideband oxygen sensor for M-250/M-300.
3. 8 ft plug and play wire harness for connection between the M-Series Controller and the oxygen sensor.
4. 4 ft wires brought out from the M-Series Controller for connections to power and analog output signals.
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PLX M300 Wideband Oxygen Sensor Controller Cheap - 
