By "loss of power situation" what do you mean exactly? Did the battery get drained to the point where it wouldn't turn the starter? If so, check to see if the immobilizer lost synchronization with the EWS. It would provide the symptoms you have.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau