Citroen C2

In 2006, there were a number of small revisions to the C2. Externally the car looks identical save minor changes to alloy wheels (on the VTR), half colour coded door mirrors, clear side indicator lenses, and white indicator rear lenses. Internal changes saw a new stereo with vehicle computer integration and some cosmetic changes to the driver displays and centre console. The previous models ran two integrated electrical systems.

The popular CAN BUS (Controller Area Network, by Bosch) and PSA's proprietary VAN BUS (Vehicle Area Network). In 2006, PSA dumped the VAN BUS system for an all CAN BUS system, giving it better functionality and compatibility with more component manufacturers. This required some of the electrical components to be replaced, explaining why the displays, radio/CD and some other electronic equipment were changed.

Information provided by: https://en.wikipedia.org/wiki/Citro%C3%ABn_C2