Vehicle is immobilised. Engine will not start, Immobiliser [PATS] light flashes on dash. [Either no crank/crank over but not fire/ run for approx. 20 seconds and cut out]. Possible instrument cluster [IPC] internal fault.
The customer’s complaint is that there is a loud rattling noise when the engine is first started. The noise heard is louder than normal for a cold engine. Shortly after the engine starts the malfunction indicator light (MIL) illuminates. (This is the same as the “Check Engine” or “Service Engine Soon” light.)
If you use a scan tool, the BMW fault code is 30C1.