aksMS

hi. im from malaysia. got me a C5 petrol 2.0 automatic. im not sure wether that "juddering" is the same problem as mine. mileage is about 150,000+ miles. it has been serviced by the authourized dealer (on schedule) since i bought it 3 years ago. it happened every once in a while. it begin after i had to cross a small flood about 2 years ago. had to do major service on the gearbox then. :( and this juddering begin.... after i start the engine, there's this vibration or juddering from the engine and the info panel shows 'ANTI-POLLUTION FAULT' and 'CATALYCTIC CONVERTER FAULT'. As I step on the gas, the car will judder even more. as i put to Drive, the engine will judder and feels heavy and no power. but, sometimes, after driving it for a while, and restart the engine, it's just dissappear. everything is back to normal. no FAULTIES. no juddering. there are also time when this thing came up, i just restart the engine and it will dissappear. i've asked the mechanic at the service center to look into this matter everytime i went for scheduled service. seems that they cannot rectify it. anyone here knows?