Hi folks

I have a pug with code p1351.preheat relay open circuit and glow plugs not supplied.i have changed the relay as i had one on the shelf. No fix still codes the same,i suspected it would but relay easy to do. Looks like the glow plugs are faulty. Where the hell are they, I can't see them. I have looked under the air filter box and around the injectors. I am guessing they are under the air box in some bastard spot. I have heard they can break off in the head, any comments. I have a few doing this code so i may get good at this by the sounds

Any help please

Stuart