Meriva purchased three years ago, good little car. Started developing an intermittent immobiliser fault three months ago. Failed to start at home RAC called. RAC could not diagnose problem as car would not "communicate" with their diagnostic system, apparently common fault with Vauxhall. Had it looked at by our usual mechanic, again could not be diagnosed. Car started intermittently. Contacted Vauxhall garage had to wait until the immobiliser came on but also had to book an appointment to co-inside with it breaking down! Eventually car again refused to start at home, contacted RAC taken to Vauxhall garage, which is another story! Apparently no fault recorded on system. VG removed immobiliser and Engine Management Unit and checked wiring. Put back together and car started. However could not find the fault. I was told that they could change both the immobiliser and the EMU at a cost of around £800 + VAT but there would be no guarantee that it would cure the problem. Explained to them that the immobiliser would come on again as this was how it had been. They insisted that I collected the car and that I paid £42 for the diagnostic test. I insisted that I should leave the car with them until the problem was sorted. Apparently the fault could not be diagnosed until the immobiliser came on again. I contacted Vauxhall customer complaints and posted on Facebook. Absolutely useless. I contacted the Managing Director who passed me to the Complaints Director. The eventual suggestion was that I return the car to the VG and a team would be sent to look at the car....at my expense! I collected the car and needless to say it is now stuck outside my home with the immobiliser coming on and for no reason intermittently starting. I am unable to drive it anywhere for fear of not getting home and I can't keep calling RAC. I say that the car is not fit for purpose as the inbuilt system to diagnose the fault has failed. I have legal insurance should I sue Vauxhall or has anyone else had the same problem? Help please?