Chappo1390

could this cause it to fail to start to? As I've also been reading could be a communcation error between cluster and ECU

Hi all I'm having some issues with my 1.9tdi a4 quattro avant. I can't seem to connect to the car with obd2 readers and some times it will show coil light sometimes it dont, when I get coil light it will start if I don't get coil light just turns over. I can connect once I get a Coil light but it's so intermittent. Anyone have any idea what is causing this?