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Trusted by tuners.

Since 2003 PLX widebands have been used worldwide to tune internal combustion engines making them run cleaner, operate more efficiently, and produce more power.

Fast and accurate.

PLX widebands employ a PID critically damped technology. When the sensor detects a change in the oxygen content, the wideband controller reacts optimally, not too quickly to cause oscillation, and not to slowly where the sensor becomes laggy. All PLX widebands are accurate to less than 0.1AFR (gasoline) and are individually hand tested before they are shipped.

Installs easily.

Plug and play install requires no manual calibration. Simply install the O2 sensor, connect the wire harness and apply power. It’s that simple.

Plays nice.

Includes a 0-5V wideband analog output for easy interface with aftermarket ECU’s and 3rd party data loggers. A 0-1V narrowband output allows you to replace your stock O2 sensor without having to weld a separate O2 bung. Works with gasoline, diesel, methanol, ethanol, LPG, Diesel, E85.

Monitors your sensor's health with

Our proprietary IntelliHealth algorithms detects the remaining life and reaction time of your sensor. You can take the guess work out and you’ll always know the condition of your sensor.

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Wideband O2 Touch Screen Multi Guage for Air/Fuel Ratio SM-AFR Wideband DM-6 Gauge Combo (Gen4)

Best Seller! The DM-6 + SM-AFR Gen4 Gauge Combo is a tuner grade Bosch LSU 4.9 wideband oxygen sensor controller with 2 1/16" touch screen gauge. Accurately reads the air/fuel ratio of any internal combustion from 0.68 Lambda to 1.36 Lambda (10:1 - 20:1 AFR *Gasoline). Fully plug and play, no sensor calibration is required. Compatible with Gasoline, Diesel, Ethanol, Methanol, E85, LPG, CNG. Accurate to 0.1AFR with less than 100mS reaction time from rail to rail. Advanced sensor health monitoring, displays oxygen sensor health and reaction time on the DM-6 gauge.

Price: $199.99
Sale Price: $164.99
Savings: $35.00
Wideband O2 Air Fuel Ratio Sensor Module for Air/Fuel Ratio SM-AFR - Wideband Air/Fuel Sensor Module

The SM-AFR Gen4  is a tuner grade Bosch LSU 4.9 wideband oxygen sensor controller with digital/analog outputs for 3rd interface. Accurately reads the air/fuel ratio of any internal combustion from 0.68 Lambda to 1.36 Lambda (10:1 - 20:1 AFR *Gasoline). Fully plug and play, no sensor calibration is required. Compatible with Gasoline, Diesel, Ethanol, Methanol, E85, LPG, CNG. Accurate to 0.1AFR with less than 100mS reaction time from rail to rail. Advanced sensor health monitoring, displays oxygen sensor health and reaction time when connected to DM-6 gauge.

Price: $179.99
Sale Price: $149.99
Savings: $30.00
2 1/16" Touch Screen MultiGauge | For All Sensor Modules DM-6 2 1/16" Touch Screen Multi-Gauge

The DM-6 Multi Gauge Display Module is an OLED automotive gauge designed to display the measured values from your PLX Sensor Modules. Measuring only 0.7" (18 mm) thin, it can be mounted virtually anywhere. The DM-6 Multi Gauge is designed to fit into most aftermarket 2 1/16" (52 mm) cups, and can be mounted for seamless integration into your vehicle. Utilizing new touch screen sense technology, buttons are a thing of the past. Navigate your gauge and menus with ease by touching the bezel of the gauge. An ideal accessory for your PLX Sensor Modules. Connect to a Multi Gauge with OBD II for even more information than any standard gauge.

Price: $99.99
Sale Price: $79.99
Savings: $20.00
Auto Gauge Ring Mount (2 1/16" 52mm) for Wideband O2 OBD2 Sensor 2 1/16" (52mm) Gauge Holder

For use with DM-6, DM-100 OBDII, DM-100 Touch. The 2 1/16" (52mm) gauge ring mount offers the perfect mounting solution for those that do not wish to drill into their dashboard or install a gauge cluster. This 2 1/16" gauge ring mount will fit any standard sized 2 1/16" gauge and also includes double sided tape for installation.

Price: $14.99
Wideband O2 OBD2 Sensor Module Connect Kit with Serial & Analog Cable Sensor Module Connect Kit

For use with all Sensor Modules. The sensor module connect kit can be used with any PLX sensor modules. It contains a molex connector, power cable, serial cable, analog output cable, and three termination pins.

Price: $9.99
Bosch LSU4.9 Wideband Oxygen O2 Air Fuel Ratio Sensor Bosch LSU4.9 Wideband Oxygen Sensor

Genuine Bosch LSU 4.9 wideband oxygen sensor is a 5 wire sensor with a built-in calibration resistor with an M18 x 1.5 thread. This is the industry standard sensor for tuning internal combustion engines of various fuel types (gasoline, diesel, ethanol, methanol, LPG, CNG, E85). The wideband oxygen sensor is sometimes referred to as a lambda sensor or UEGO. It is the ideal sensor to be used with all PLX Wideband Controllers. Each sensor is hand tested by a PLX technician to verify its accuracy and precision. For use with PLX Gen4 or later Widebands ONLY.


Compatible with PLX Devices Wideband Gen4 and later
Compatible with Walker P/N 250-25036, 250-25075
Compatible with Bosch P/N 0258017025, 0258017271, 0281004028, 0258017036

Price: $99.99
Sale Price: $59.95
Savings: $40.04
Bosch LSU4.9 Wideband Oxygen O2 Air Fuel Ratio Sensor Harness Bosch LSU4.9 Sensor Harness

The O2 sensor harness connects the PLX Wideband Controller with a Bosch LSU4.9 sensor. It includes a 6 position molex mini fit jr male plug on one end and a standard 6 position Bosch LSU4.9 connector on the other end. The cable is 10ft (3m) long and is made in USA. For use with PLX Gen4 or later Widebands ONLY.

Price: $29.99
Weld In Oxygen Sensor Bung Fitting M18 x 1.5mm M18 x 1.5mm O2 Sensor Bung

The oxygen sensor bung is a must have accessory for installing your wideband oxygen sensor to your exhaust pipe. Its steel alloy makes it easy to weld. The thread is an M18 x 1.5mm pitch. Works with Bosch LSU4.2, Bosch LSU4.9, NTK/NGK L1H1, NTK/NGK L2H2 wideband oxygen sensors.

Price: $7.99
Oxygen Sensor Bung Fitting and Plug (Weld In) M18 x 1.5mm O2 Sensor Bung Plug

The oxygen sensor bung plug is the ideal accessory for use with our oxygen sensor bung when your wideband oxygen sensor is not in use. The thread is an M18 x 1.5mm pitch.

Price: $7.99
MultiGauge Link for Smartphone Interface with PLX Devices Sensor Modules MultiGauge Link Adapter

The new MultiGauge to smartphone adapter takes aftermarket gauges to the next level. Our Wideband SM-AFR or SM-Vac/Bosst coupled with the new MultiGauge Link™ allows you to wirelessly send data to any smart devices eliminating the need for installing dedicated gauges in your vehicle. Simply launch the MultiGauge™ app, available now for Apple and Android, to instantly connect to your smart device for brilliant real-time gauges.

Price: $99.99
Sale Price: $64.95
Savings: $35.04
Wideband O2 Touch Screen Multi Guage for Vacuum & Boost SM-AFR Wideband + MultiGauge Link Combo (Gen5)

The new PLX Wideband AFR Smartphone combo takes engine efficiency to the next level. Our Wideband SM-AFR controller coupled with the new MultiGauge Link™ allows you to wirelessly send data to any smart device eliminating the need to install dedicated gauges in your vehicle. Simply launch the MultiGauge™ app, available now for Apple and Android, to instantly connect to your smart device for brilliant real-time gauges.

Price: $249.99
Sale Price: $149.99
Savings: $100.00
MultiGauge Link 3.5mm Y Splitter Cable

For use with connecting to the output for Sensor Module serial transmit (TX) to feed both DM-6 gauge and MultiGauge Link simultaneously.

Price: $4.99
MultiGauge App OBD Car to Smartphone Software MultiGauge App for Apple/Android

This MultiGauge App is designed to function with the PLX Devices Multi Gauge Link hardware interface. The Multi Gauge Link includes a Bluetooth LE wireless communication protocol designed to work seamlessly with this app. PLX Devices sensor modules can be connected in a daisy-chain and the Multi Gauge Link is connected to the last sensor module in the chain to transmit sensor data to your smart phone for visual display.