Oil sensor defective after oil change?

Hello together, I have the following problem: Yesterday at a large chain was to perform a due oil change for my 3.0TDI. Car parked, the mechanic explained the car lift mode again (What is this? Oh the vehicle has an air suspension?) and then was asked to the office, as I was not allowed to stay in the workshop. Office had large windows, so I had my car in view all the time. After the workshop was finished, I should drive the vehicle out again. n. First problem here: vehicle didn’t jump. Looked after an empty battery, the master got a starter, it went without problems. Has still read out the error memory, allegedly no errors. Here came the first time after the start the error “Oil Pressure Sensor: Find Workshop”. I drove out first, then addressed the master to it. Statement: Yes, the ECUs may not work so properly after the battery was empty. e times, if the error still exists tomorrow we look further, but the sensor is here (shows at the top left) and I was here (shows at the bottom right). There can be nothing broken by us. I was satisfied with it (must continue working). And what was today? Of course, still the same error. My question to the more technically experienced among us: Can the sensor somehow have been damaged when changing oil? I read that the sensor from below Also accessible, there can have been something broken when the mechanic unscrewed the underguard to get to the oil outlet opening? There he (feeled) rather roughy went and stood at first without a clue what he had to do (looked like that for me at least). Would be very grateful for your help, maybe one or the other has some advice for me. In the future I will consider perhaps doing the oil change myself… Only trouble with incapacitated workshops Greetings Chris