I've asked a similar question before:
Unfortunately I haven't progressed much. The first product I tried was a CANLogger 2000, I got nowhere with it, so I sent it back.
After seeing some youtube videos using USB2CAN, I decided to get one of these, I ordered the cabled to go with it to connect the device to my car via the ODBII socket.
I've been through the set-up on linux with the device recognised and the LED green which indicate's its ready. I've set the bit rate to 500,000 but I see absolutely nothing.
Can any help ? Is this bitrate correct? Is there guide or individuals that could help me?
I've tried using several sites to help me set-up and the kayak software, also cansiffer, but I'm seeing nothing at all.
USB2CAN Setup I've read here:
Volkswagen and Audi technical data The bit rate could be 100kbps, is this actually 125kbps ?