Head carboning up

2010 Citroen C4 exclusive 1.6 turbo
Car: Citroen C4
Year: 2010
Variant: exclusive 1.6 turbo
after 20,000 kilometers the head is that badly carboned up citroen are replacing the head ? and the timming chain which is out of wear tolerances. at 10,000 kilometers the co2 sencors were replaced carboned up which they replaced. I keep telling them they are treating the symptoms not the problem . has anybody got any clues
Problem added: Feb 26, 2013 (11 years ago)
are you using the correct oil. Should be low ash.
Answered Feb 26, 2013 (11 years ago)
am using citroen recommended oil through dealer. iam now concerned about catalictic converter as well .
Answered Feb 27, 2013 (11 years ago)

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