Hi all, I've been having trouble with 2004 2.2 Tourer and have replaced the glow plugs but still have the P1384 error. I have obtained a replacement relay but I wanted to make sure that I followed the correct procedure for installing it. In particular I wanted to see if with the ignition off I can simply unplug the old one and install the new one or do I need to disconnect the battery or other leads? Thanks in advance for your help and advice.