Need a way to limit DC voltage of MAF sensor output
If you want accuracy then consider using a precision clamp circuit: -



V5 is the input and can be a linear 0 volts to 5 volts signal as per your requirements. There are two active precision clampers; one sets the positive limit - V3 would be a DC level of 4.6 volts in your example.

There is also a negative voltage clamp shown but that is not needed.