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"sensitive" engine management

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i bought a 2002 st170 nearly 3 months ago. ever since i got, the check engine light keeps coming on. whenever i take it back to the garage where i got it from, they keep telling the computer is saying there's nothing wrong with it and that the engine management system is just very sensitive(which i find hard to believe!). i was wondering if anyone else has had similar problems?

also i'm 100% sure that the air conditioning pump it running perminantly as well, the switch works fine and the light on the switch go on and off ok, but it blows out freezing cold air even when it says its off. i've mentioned this to the garage as well and they said that the computer would be able to tell if that was the case( which i also find hard to believe!!) do anyone know if the air conditioning is connected up to the fault finding thingy?

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this really anoys me when garage fob u off sometiems you just need to go to ford they fobbed me off when my engine kept losing revs and it had a squeek i found the squeek and the revs the ford pcm needed to be re programmed and the cam belt reset just go to ford it is wellworth it


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