Hello
You could also try unplugging the Mass Air Flow meter (MAF).
Normally you would get a lean mixture fault code but worth a try.
If you unplug it before starting, the ecu will automatically drop to default fuelling values but you would at least see if the fault disappears.
Also it's worth a check for corrosion on injector connections causing resistance, so unplug and clean each , one at a time then start the engine to check if the fault is still there.
Process of elimination I'm afraid and I do think you need either a Volvo dealer/ specialist or member from the forum here to read your car with Vida. There are elements of data the SnapOn reader cannot access.
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