DSC 4x4 Engine Failsafe

[ian1967]

I've searched the forums high and low to find an answer to my question, but as yet have not been able to find an answer, so here goes to see if anyone can shed any light on this.

I have a 2002 3.0i Sport. Purchased around 8 months ago and for the first month we owned it, no problems at all, running like a dream. Then all of a sudden, while halfway to work one day, up on the screen comes DSC 4x4 and the Engine Failsafe Prog message, with the DSC lamp and the ABS lights on the dash. Parked at work and called the local dealership who said bring it in.

Later that day, started her up and drove about 40 miles to the dealership and no messages came up on he dash. They ran a diagnostic and said no faults found.

Drove the car home and low and behold, the DSC 4x4 error message comes up again, and then after, about every 10 miles, it comes on. A little concerned, back to the dealership, who this time decided that it must be a valve that needed changing, and at the same time its service was due, so that was done.

For around 500 miles after that, all was going well, no error messages, no problems. But then on a long journey, after around 200 miles, here we go again with the DSC 4x4 Engine failsafe error message.

Key out, key in and start her up and the error dissapears and evenutaully we get home, after seeing this error message every now and then.

A week later, we took the car for its annual MOT and the only thing it failed on was the Co2 emissions, which is going to be fixed in a couple of days.

I guess my question to other X5'rs.. is has anyone had this problem before, would the errors be down purely to a faulty co2 sensor?

Any advice would be gratefully received before the dealership try to allieviate my wallet of some more hard earned cash.