The exhaust emission control indicator light has recently come on on my Astra Sport 2008 1.6 convertiable, also the engine seems very lumpy with the revs dipping up and down slight. Any ideas what the problem could be? The car has only done 42,000 miles and I have only owned since October 2013, when it was supposed to have had a full service and I have only done about 3,000 since then. When I last filled up the tank I put in some petrol treatment, could this cause any problems?
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