Hi This is Shaun and my wife now wants me to summarise the experience we have had with the C5 in the hope some of the members could help. This is Long I am afraid and if anyone manages to read to the end or make any sense out of this I need all the help I can get with this car. I must admit I am tempted to get a private reg for this car as a tribute but 666 is so expensive. I have tried the search and have attempted to reset the immobaliser but it sounds a lot like the key sync I have tried and did not work. I realise I should use the forum with threads but have not managed to get the hang of this yet and am getting bugged by the Mrs just to put up the problems so here goes. I am a bit of a Luddite but not totally useless when it comes to modern technology as I have been an instrument technician for more years than I care to mention so technical things do not frighten me. As yet I have not been able to find any manual for the C5 apart from the hand book and everyone even the dealer seems to have different ideas. The car compared to my old Xantia 2.1 TD needs revs to start to pick up the pace and seems to have such high gearing it will only pick up enoughf to overtake when it reaches 70 . The problems started with not starting or even attempting to fire when spinning over, RAC found blown fuse and it started first time (unable to determine what the fuse was for just engine 15amp) the car worked for a day then same again but fuse OK . Next day it started but had the diesel additive low and filter blocked alarm so I took it to the dealer, on the way down the wipers packed up but I decided not to mention this as it was going to cost enough. Went to pick it up the next day it would not start so dealer took it back inside boosted the battery and it started so was told it needs to see 1400 revs or it will not even try to start. Told the alarms will clear as soon as I get the fuel near empty and re fill it (wipers worked ok). Next morning no start so attempted to jump from the Jeep with no joy so stole the batter from the jeep and it fired straight up. Went away for a month and expected problems when I returned but it fired up straight away so went and purchased a £60 battery but did not fit it. Used it for a 60 mile journey with no problems, stopped and started ok on the way down and when I went to set off back but died at slow speed over speed bump 20 feet from start point. Used fully charged battery with no joy, disconnected battery for 5 min and messed with key fob until it finally started and ran 60 miles home. Low on diesel I went to garage but car cut out on roundabout and would not start. As the fuel light had come on I assumed it must be fuel so went and got some poured it in and it started first turn without so much as a splutter and within less than 1 second so don’t believe it was out of diesel. Next day I try again and half way through a 60 mile trip the wipers pack in but car still goes OK. Next stop back to normal so remove battery for 5 min re sync the key (picked up tip from forum) and starts first time and wipers are working so on we go. One further stop without problem (fluid level never did clear when filled with diesel) then left for 20 min but will not start even with new battery, disconnection, re sync, verbal abuse or physical assault. RAC called and informed these things are nothing but trouble and it will be the diesel pump so with a couple of thumps with a hammer on the fuel tank he called a low loader an once again I return without my car. The last time I saw immobiliser fault on a few occasions but the RAC were insistent it was the pump but I think it is some kind of immobiliser problem. Any thoughts gratefully received. SHAUN