EL-50448 TPMS OEC-T5: For Vauxhall vehicles equipped with tyre pressure control system, a "sensor newcomer procedure" must be carried out after a tyre rotation, a replacement of the remote door lock receiver module or a replacement of the tyre pressure sensor. This new learning procedure can be carried out with EL-50448. Vauxhall RDKS learning system: with this EL50448, you can reprogram your tyre pressure in just 3 steps. This TPMS tool can easily activate the TPMS sensor with just a press of a button. Tyre pressure gauge: EL 50448 works with all General Motors products (Insignia, Astra, Combo, Ampera, Zafira, Antara) that have TPMS sensors. How to use: make sure your vehicle is in TPMS learning mode before using this TPMS activation reset tool. Hold the tool against the side wall of the tyre near the valve core. Press the button while holding the tool against the tyre side wall until you hear a horn sound from the car.