Wheaty

I had the front shocks done about a month ago, nothing else done though

I’ve had my Octavia 2009 2.0 TDi, intermittently throwing me several warning codes and then going into limp mode, then it rested and works fine after a key cycle. The error codes are P0016 (cam and crankshaft sensor positions) P0003 (fuel regulator circuit low) and P0651. Given that they all appear at the same time, and I have checked and both the camshaft and crankshaft sensors appear to be working and getting accurate readings. Does anyone know what the issue may be? I’m guessing it’s some sort of electrical gremlin but I’m not sure where to begin looking