OBDII Error Code Clearer for Volvo/Renault 4th Generation Euro 5/6. This OBDII adapter allows you to clear fault codes, including software replacement of components such as NOx sensors, diesel particulate filter (DPF), and soot level reset (the latter two are applicable for Euro 6). To do this, plug the adapter into the OBDII diagnostic port and turn on the ignition for 20 seconds. All codes will be cleared and the restriction mode will be removed.