Don't worry about it. It's probably a code relating to the "fly by wire throttle motor" P1161 it's a crap ecu system. Even if you changed the bits according to Citroen, it would only sort if temporarily for a month or three. You change the pins on the throttle pedal end first, then if it does not work, you change that part of the wiring loom & if that does not work, the throttle motor itself to cure the MIL light. It's a common fault on the C3. Like most modern cars, a load of Shite, when an electronic fault occurs. It should be possible to reset the MIL via a diagnostic test, but it wont last for long.