We set off at 8 a m on Boxing Day to travel to our son's in Bedford for an overnight visit, in our three and a half year old Citroen C4 Picasso (out of warranty) but only 20,000 miles on the clock. There we were, 63 miles into our journey on the M3 when.' ESP/ACR system faulty, take vehicle for repair ' appeared on the display and the engine went into a very slow limp mode. We left the motorway and called the AA who attended very promptly. The first task was to find the diagnostic socket. Once located, had to replace half of the trim removed trying to find it. The diagnosis was nothing to do with the ESP/ACR it was a faulty injector on cylinder 2. Car not repairable on the roadside so trailered back home behind the AA transit. Once home the car was deposited on the drive and we set off again in our old car (another Citroen) in much heavier traffic and finally got to Bedford about 4.30. Had a good time with the family. The next downer is the estimate for the repair is £608. We'll pi----d off. I promise never to buy another.