2002 Citroen C3 P1336

P0204 & P1136 prob and periodic cut out of engine


had a new cam belt fitted by a garage other than citroen and after 7 wks code P0204 and P1336 started coming up. Garage couldnt find out what was wrong apt from cleaning cylinder 4 (P0204 code) - (the only code they told me about). Prob kept on occurring. Then I had to get AA out (as every time I started car it stalled, but by the time they got there it had stopped stalling) they said there was a another code that could only be read by citroen garage the P1336 code. I checked internet and it says crank/cam sensor range/performance. Could this problem be connected to the fitting of the new timing belt?