Simon Dean
Software issues,update via dealer the engine ecu.
Reset adaptions and monitor vehicle.
If code re appears fit gen cat,also would recommend oxy sensors replaced as best practice.
HTH
Simon
Message Thread 
Citroen C3 1.0 2003 - CAT aging fault, code P0420 # - Alf Cox June 19, 2011, 8:11 pm
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on June 20, 2011, 9:24 pm, in reply to "