LURICO Code Reader Vehicle Diagnostic Scan Tool for OBDII/OBD2 Vehicles Read & Erase Engine Fault codes

I bought this a year ago (January 2018) but, only used it today for the first time. I used it on my Ford KA 2004 1.3 Duratec engine as I had a misfire. I followed the instructions and had a result straight away telling me number 4 spark plug was at fault. I checked the plugs and they all look as they have seen better days. I reset the device to clear the fault. I'll buy a new set tomorrow and see if this clears the fault?

Rubbsh peice of kit, failed to connect to my Toyota Corolla after several attempts. Error link notice coming up always. Had to buy Ancel ad210 which worked perfectly from the start. Returned this for refund would not recommend this at all

Fantastic item and very easy to use.