Good Day R56 Owners, trying to trace down these codes to find out what I need to fix/get done.
I know they are kind of generic but I know P0597 has to do with the cooling system and P0503 has to do with Speed sensors.
Where should I start to get these codes out?

 

P0597 -> replace thermostat
P0503 -> not totally sure what needs to be done, but you are right, it's something to do with ABS sensor or DSC module

 

This link may be of some help to you:

https://www.obd-codes.com/p0503

 

Yes, thermostat needs to be replaced.

For the second code, could be a bad wheel speed sensor or connection. I would start by getting the car in the air and checking all the wheel speed sensors to make sure the wires aren't broken, check connectors to make sure they are plugged in, and then check that none are corroded.

 

Okay idk how I got so sucked in and read the whole thing, but I feel a little bit smarter. I can sleep happy tonight.

Thank you.