Thanks for the replies. I had mentioned that it was auto in my post. The battery is a year old. Not sure what diagnostic gear he was using. Lights on were stabilization, traction control, tyre pressure, gearbox malfunction but ok to continue driving. The car drove in fine but when he started it again there was no gears to be found.
I sent my car to a family member for a service. The car drove in fine but not will not select any gear now. It was occasionally throwing all the lights on in the car. It's been plugged in but nothing coming up. Any suggestions please 🙏
2 litre 2014 A6 Avant C7 auto.