Hello everyone, I need help please . My Superb MK1, 2.5 V6 diesel won't start well when it's cold.  I checked the glow plugs - no power.  Can you tell me what could be wrong and what I need to check please ? Thank you in advance. Alex 

I don't know if the V6 diesel is the same, but in the 4 cylinder diesels there is both a high current fuse glow plug and also a double relay in the ecu box. 

 

Here is some info....

If that doesn't help, you'll need a V6 wiring diagram, or just chase the wires back from the plugs and keep checking with a meter. For what it's worth, the large glow plug relay seems quite readily avaiable, but a a rather high price.

Thank you