It is 94 w124 e320 and check engine light came on and i got 4 flashes from onboard dignostic box.

Searched and found it may be the following:

4 Air injection system faulty hot film mass air flow sensor with hot wire

so now i do i need to get rid of this light off?

 

WDBEA32E5RC137992

 

Thanks for your response and well... i don't know if there were multiple errors when I tried to reset.
The first time i played with OBD, it flashed 4 times as I have mentioned then, i tried to reset it... didn't
I then pushed OBD button again this time it flashed 5 times... of course i tried to reset it by holding the button about 8-10secs...
now the check engine light is gone.... and I droved it about 50 miles and CEL didn't come back on... what does this mean?
do i have faulty MAF sensor or not?