Hi Everyone. I hope someone out there can give me a bit of decent advice re my sick Signum. I'll try to make a long story as short as poss. The car has had loads of problems over the last few months starting with poor cold starting, then engine going into limp mode intermittently. I had it into the local stealers who diagnosed a faulty high pressure fuel pump and pressure regulator. Before I had that fixed, the water pump went which cost me just under £1500.00 to get replaced (the job grew after they had got it into their workshop). When I got the car back, the previous faults had disappeared even though they did not replace the pump or regulator although the cold starting was still a problem. A short while later, it developed a constant problem where it goes into limp mode. Everytime I take it to the stealers, they want to charge me for "diagnostic checks" which never seem to diagnose the problem and they just keep wanting to replace parts until the problem is solved. I have now got myself a code reader and the main codes that keep appearing are P0301 (cylinder 1 misfire) this is the one that seems to cause the limp mode and comes up all the time. P0303 happens occasionally and the one that is baffling me is P1666 which now comes up quite regularly. I cannot find any info to what Vauxhalls definition of this code is. Various "knowledgable" people have informed me that the coil pack needs changing, the ect sensor needs changing and a list of other parts that it too long to go into. I don't mind changing parts if they are faulty, but at this rate I'm going to be bankrupt changing parts that do not cure the problems before I have a car that is driveable. Any help would be greatly appreciated. Here's hoping.