Stalled Car: Causes, Repair & Prevention

Hello everyone,
I've only ever read about this before. Now I'm experiencing the problem myself.
After the timing belt was replaced on my Audi Avant 2.5 V6 TDI at the Audi dealership, it jumped timing after only 30 km. I took the car back to Audi. After 3 weeks, they discovered that the valves on one side of the cylinder head were bent. They replaced the cylinder head with a new one.
Since then, the engine control warning light has been illuminated.
The error code indicates a fuel shortage sensor issue.
Audi had already replaced the surge tank with the pump twice before they discovered the misaligned component.
The belts have arrived. We initially thought it was due to a diesel shortage.
"Today, I broke down 200km from home. At 160km/h, the engine lost power."
Towed to the nearest Audi service center in Hagen. Bled, engine running!!
It probably also triggers the sensor, which then deactivates the EP (presumably referring to an electronic parking brake or similar system).
Installed a new surge tank with pump and sensor. Warning light is on.
"Filled up the tank. (Bosch says the error message will only disappear when the tank is at least 3/4 full.)"
The lamp is still on. I snuck home at 80 km/h. The workshop that did the timing belt change can't fix it. Forget about them.
The first mistake during the timing belt replacement was a screw that was too long in a tensioner pulley. It was stuck in the housing, but the inner ring wasn't properly secured, causing the pulley to run crookedly. This resulted in the belt jumping off.