My EGR valve has been putting the car into limp mode, so for the last year or so I have just unplugged it and although the MIL is on, the car isn't in limp mode anymore. Its a B8 3.0tdi (CAPA) engine. I would assume it needs cleaning, but looking at the procedure, it says the coolant need to be drained first. Is there a way to remove it without draining the coolant? its this version (not the version with the O-ring): If anyone knows a way or has any advice, I would be most welcome! My DPF hasn't been able to do any active regens for 20Kmiles, and I assume that's because the EGR needs to be functioning to this to take place.