Engine won't fire when starting even though fuel system appears to be engaged. The battery is fully charged and I don't think it is the remote or immobiliser as the ignition is not dead. I had the same problem last year and Mercedes said it was the High Voltage Relay system. They replaced the part and it worked until now. Interestingly, the ABS warning light came on the day before the starting problem occurred. I understand from other messages that there could be a link. The car has done 80k and is in very good condition. I am desperate to resolve the problem.