i had the same problem when i first got my 155 2.0.
Injector light kept coming on but no problems with engine jerking or nuffink... just a bloody bulb coming on.
Took it to the garage and ran it through the diags... turned out to be a Faulty Carbon Phase sensor... dunno what it does, but they replaced it and all ok now... never had a peep out of it in just over a year [img]smilies/biggrin.gif[/img]
not a cheap part if i remember rightly...(150 quid ish i think).. take it to an auto electrician's... they'll be able to do diags on the system and give you and answer.
"Consider a high performance engine - it works fine with loads of fuel going through it, but when it is idling it coughs, farts and splutters.
Jason's stomach is obviously high performance judging by the coughs, farts and splutters when he is not eating."
Its goin for a check up on Saturday so I'll mention it. Looking thru' the previous posts regarding this there were lots of reasons offered for the light, basically it was all down to sensors, dont think anyone mentioned the injectors themselves??? [img]smilies/confused.gif[/img]
had the same problem with mine, turned out it was the colant temperature sensor, it reads the temp and if it isnt within its limits it turn the light on, ended up having a faulty thermostat, stuck open, over cooling the system, got replaced, no light, hurray....get your local alfa specialist to check the fault log, this should point you in the right direction.