Charade GTi 1600 - 1996. - emission problem

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I live in Belgium, and have problems to find a dealer to help me with the emission problem. The CO is to high, and there is no fault-code in the car. The dealer wants to change the Katalisator (and all the rest of the exhaust). Is it possible to correct the CO emission with a computer? non of the dealers seems to have one. Because of this problem, the car is off the road now, no permission to drive. HELP!!!!

rich mixture

ive got a sporty also.and had this problem when the m.o.t. came along,try disconecting the battery,turn ignition on and count to 20.turn off ignition,reconnect battery.my sporty was holding a fault code that made it run on limp mode but didnt show on the dash!!good luck