In vehicles with EURO 3 and higher vehicle emissions standards the second oxygen sensor emulator is located after the catalytic converter. It plays a diagnostics role. If it detects any irregularities on the basis of the data from the engine control unit it displays an error on the dashboard and the engine can switch into emergency mode (depending on the make of car). It is often manifested by big power drop. These problems arise in the event of removal of the catalyst, low efficiency, or replacement with jet pump. In such situations, it becomes necessary to mount THE SECOND OXYGEN SENSOR EXTENDER. The catalyst can effectively reduce the power output of 2 to 3%, and the maximum power speed of up to 5%. removal and the use of emulator is the easiest way to low-cost raise of power; The emulator can also help in case of problems with the installation, which due to the detection of very mixture will display the CHECK ENGINE on the dashboard. front surfaces enabling perfect tightening. Washer in the set, to adjust the angle of screwing in the extender. Threads are made with dedicated tool, perfect accuracy and repeatability. Exhaust gas inlet hole 2 mm; In extreme situations narrowing of the inlet hole prevents motor failure (driving at high speed). Perfect for awkward spaces, where there is no room for the straight extenders Installation: Unscrew the oxygen sensor, screw in the emulator in place and then screw in the oxygen sensor. Extenders are from Internal and External Thread: M18x1.5 Height: 40mm Weight: 130g colour:Brass color Material:metal Package Contents: 1 * Oxygen Sensor Extender 1 * washer Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.