i bought an elm327 cable for obd connection with my car octavia5 vrs. im connecting the elm327 cable through usb to serial adaptor and :

in bmw 316ti e46 (model 2003) working without problems with digimoto, panscan, proscan etc

in mercedes c200 model 2004 working perfect

and with my car skoda octavia5 vrs model 2006 no connection

what is the problem?

thnks in advance