Flashing glow plug and engine management light

[Hussain17]

Hi, i’ve recently bought a seat leon 1.6 tdi and just today the glow plug light came on along with the engine management light. I’ve received several error codes ;
1. P165F00: Oil Pressure Regulation Valve - Short Circuit to Ground
2. P023B00: Charge Air Cooler Coolant Pump - Control Circuit Low
3. P199D00: Cylinder Head Coolant Valve - Short Circuit to Ground
4. P16BF00: Heater Support Pump - Short Circuit to Ground
Has anyone got any tips on how to solve these or any possible solutions? I think it’s something to do with the wiring which is causing maybe some overheating issues in the engine. If anyone has any advice for me , it would be highly appreciated. Thanks