Wideband Controller for BOSCH LSU ADV

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The LDperformance Wideband controller uses the Bosch LSU ADV sensor and is based on the original CJ125 chip which provides reliable and fast AFR measurement. This is the best and newest lambda sensor technology available from BOSCH. Suitable for use with most Standalone ECUs.


Product Description

Bosch LSU ADV lambda sensor

The Bosch LSU ADV lambda sensor is the next generation wideband oxygen sensor. Compared to the older 4.9 (and 4.2) sensor the LSU ADV is more accurate at wider working temperature range. It also heats up quicker. 

It is now the recommended sensor for motorsport applications.

  1. 7.4 AFR to 25.5 measurement range
  2. Accuracy <0.1AFR
  3. Simple to install and operate
  4. 0-5V Analogue Output
  5. 100% Accurate digital signal between Controller and Display
Technical details
  1. Uses PID algorithm to control probe temperature
  2. Initial Heat up of sensor designed according to Bosch specification
  3. Immediate sensor turn-off under fault condition to protect sensor
  4. 3D Printed enclosure
Wiring diagram



  1. Good visibility, fast response screen
  2. Adjustable brightness
  3. 0-5V Signal input or LDperformance digital signal (automatically recognised)
  4. Big digit size – 1 inch, instead of the common 0.56".
  5. Size: 78mm x 40mm
Internal Hardware
  1.  <0.5% accurate voltage reference
  2. Separate voltage reference from display supply
  3. 10bit ADC with improved resolution using successive approximation algorithm
  4. Hardware and software noise filter
Wiring Diagram


Brightness control

Brightness can be controlled using a potentiometer connected as shown below.


Or alternatively, to dim the display just connect 12V to the "12V Brightness" port of the connector.


How to use

  1. Connect Bosch LSU ADV oxygen sensor using the extension lead to the Controller
  2. Connect 12V and GND to the corresponding terminals of the Controller and AFR display
  3. Connect one of the Controller signal wires to the AFR Display input
0-5V Analogue output

The analogue 0-5V output corresponds to 7.35AFR to 22.39AFR. To convert from voltage to AFR use the formula: V*15.04/5+7.35. The output is compatible with many Wideband AFR displays as well as the LDperformance AFR display.
During the initial heat-up phase of the sensor, the output will toggle 10AFR, 20AFR. This is done to verify the accuracy of the signal and the gauge.

Digital output

The Digital Output works only with the LDperformance AFR display and is used to 100% accurately display AFR on the gauge.
The LDperformance AFR display has a single input which can automatically detect if analogue or digital signal is connected.

Why LDperformance Wideband

By integrating the CJ125 chip which is specifically designed by Bosch for their lambda sensors, faster response times and more accurate readings can be achieved. The kit also uses the best and newest lambda sensor technology LSU ADV which is the successor of LSU 4.9 

Sensor Calibration

No user calibration is required for proper operation. 



Full kit, Wideband controller+AFR display, Wideband Controller+Bosch LSU ADV, Wideband Controller only, AFR Display only