Citroen C4 (and other models) Replace original radio On Citroen cars (covers Peugeot as well) when you remove the original radio systems the Parking sensors and steering wheel controls stop working. In addition to this the TRIP computer will also stop working. We can now replace the radio with a host of aftermarket systems (Pioneer/Kenwood/Alpine etc) and fully integrate these with the steering wheel controls and parking sensors. In addition we can keep the TRIP computer working.
You can now upgrade without any worries.