I purchased the car in march 2006 and after washing the car I heard the horrid whirring noise from the rear brakes, this only happens when the car is in reverse and is wet, but can be cured with a good dowsing of brake cleaner over the calipers.
The car was then recalled for a gearbox fault with the software and was rectified.
The car tells you what gear you are going to be in and not what you want it to be in, as I like to set off in first gear, but the c2 likes second gear to start, and sometimes is slow to select reverse or neutral.
A strange whistling noise has now appeared from the engine when driving, but not when it is parked.
The viscous fan stayed on one day after it was parked up, I thought it was just cooling down, but the fan did not stop, so I restarted the car and the fan stopped and its not happened since.
The climate control stayed lit and operational even after the key was removed, but again after a restart with the key the problem righted itself.
This car is great to drive and is quick off the mark and will give other motors a run for their money.
The interior is smart and funky with all the gadgets of air con and climate control as well as cruise control and the sliding rear seats.
To me most of the faults that seem to occur are mainly electrical and after a turn off and re start interval the faults seem to right themselves or most of mine do anyhow.
Failing that remove the battery for 10 minutes to let the car reset and reboot and problems should clear.