As with Darren mine was doing similar things and it turned out to be the tach sensor in the front of the motor. If that goes it puts the whole egr system into a limp mode of sorts. I don't think it will illuminate even if there is an error with no1 injector though, I've had my no1 unplugged before with no light.
I think the sensor in the fuel filter illuminates a seperate light doesn't it?
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