Mark Carter
That fault code can be logged for lots of reasons.
What diagnostic tests were carried out to prove/surport the fault code prior to fitting the new component?
Regards Mark
Modern cars, Its all wizardry and witchcraft
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, 8:44 am, in reply to "