Fuse #4 in engine bay powers MAF sensor HEATER, not the sensor itself, so what was the 3 digit code number?
#4 powers most engine Key on 12volt systems, i.e. the computer, fuel injectors, solenoids, fuel pump relay(not pump), so if this fuse was blown you wouldn't get any codes at all because computer would be off
The MAF "sensor" part is powered by computer, 5volts, no fuse
OBD1 or OBD2 codes often don't mean what a DIYer thinks they do, even Pro mechanics tend to just swap out sensors if they see a code definition that mentions that sensor
A sensor mentioned in a code definition usually means the sensor IS WORKING or it wouldn't have a low or high range, it would have NO RANGE/broken
So don't SHOOT THE MESSENGER when a code comes up, lol
And yes, clean the MAF sensor, once a year, easy to do
Computer compares MAF sensor data and throttle position data to see if they are in sync with engine RPMs
The computer "knows" its running a 4 LITER engine so it "knows" how much air should be coming in at any RPM and any throttle position, its just MATH, and thats what computers do, fast math
So MAF sensor low code could just be a dirty MAF sensor