I bought a cheap OBDII adapter (ELM327 V1.5 interface) from eBay. I can connect to the OBDII adapter using the multiple software. But every software result is same saying unable to connect ECU. Any experts here could help me on this, please? And one more important thing I have recently noticed is my check engine light never comes up when I put the key ON. I extremly need help on this too, please. Vehicle Info: Audi A4 B6 2004 1.6Engine
