In vehicles with EURO 3 and higher emissions standards, the second oxygen lambda sensor emulator is located after the catalytic converter.It plays a diagnostic role.If it detects irregularities based on data from the engine control unit, it displays an error on the dashboard and the engine may go into emergency mode (depending on the car brand).It often manifests itself as a big drop in power.These problems arise in the event of removal of the catalyst, its low efficiency, or its replacement by a jet pump.In such situations, it becomes necessary to mount THE SECOND LAMBDA OXYGEN SENSOR EXTENSION. The catalyst can effectively reduce the output power by 2-3%, and the maximum powerspeed up to 5%.Removing it and using an emulator is the easiest way to increase power at low cost;The emulator can also help in case of problems with the LPG installation, which due to the detection of a very rich mixture will display the CHECK ENGINE message on the dashboard. Installation: Unscrew the oxygen lambda sensor, screw the emulator in its place then screw in the oxygen sensor. The extensions are Specifications: Material: Brass Internal and external thread: M18x1.5<br /> Height: 40mm Package size: 5 * 4 * 3cm / 2 * 1.6 * 1.2in Weight: 130g / 4.6 oz Package List: 1 * Oxygen Sensor Extender