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If you're not getting any misfire it could be a number of things causing your anti pollution light to come on.
First thing though take your car for an emissions test and see what it comes back with. It could be you need your lambada (O2) sensor/s replacing. They're relatively cheap to replace so it's a good place to start.
Failing that you've prob got a sensor malfunction somewhere on the engine, could be your IAT (intake air temp) or
(crank position) sensors that are at fault. Take it for a diagnostic to find out exactly which one because replacing sensors can be costly.
Currently in Mikey's garage:
1996 Mazda MX-3 V6, a 2002 1.2 8v Fiat Punto active (the Wife's!) and a 1998 Suzuki GN 125. Used to own a 2002 Laguna II Dynamique 1.8 16V (Now Sold yey!)