Hello guys I have a A4 B7 2.0 that had a oil leak coming from the oil filter housing, I used some youtube DIY and was able to replace it at home, however now the car won’t start and when I run the obd it gives me: P0201 - P204 ( Injector 1-4 Circuit Malfunction) when seeing this I thought maybe the fuel injectors might be disconnected so I checked them and they’re all connected properly from what I can tell, any information would be greatly appreciated it, thanks!