Hi all I have a r55 with the n47 lump I have noticed that I have an error code (no lamps) stating I have 1 and 2 glow plug activation, I have changed the relay and the error stays which is saying that this is the plugs that are at fault, how difficult is it to change the glow plugs and what the best way to test them in situ before I spend on new plugs?
or could these errors be caused by something else?