https://docs.emtronaustralia.com.au/engine-management/functions/lambda-control/onboard-lsu49-sensor-control/index.htmlIntroduction The KV series ECU has the ability to interface directly to a Bosch Lambda Sensor(s), model LSU4.9. To achieve the optimal control of this sensor, the ECU uses a genuine Bosch Integrated Circuit technology. It provides very accurate data on pump current which equates to Lambda and also Nernst Cell Temperature which is used for precise heater control.Hugoen-us