1995 Other Vauxhall Models car show's up light:

Engine Performance problem
1995 Other Vauxhall Models All Wheel Drive Automatic 12500 miles
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Hi,
I have a vauxhall omega, 1995, the reg: m62trr.
The problem is that on the front srceen a light come's up which mean's: control indicator for engine electronics. We do not know what this means, i have took the car to a dinostic manchine, and it said that it is the mass air flow sensor ref: 0280217503.
But what does this do, cause i put one in but still the light didi not go.

Pls could you help me as i'm very confused
my tele no: 07508112939.

THANKS.