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light goes on after about 90 miles code comes up as mass air flow
i have two issues that might cause this situation, first you may be experienceing the onset of an a.b.s. or t/c problem. if everytime you drive and around the same miles(40 miles) pass when the engine light appears good chance the abs pump can be defective. The second and least extensive/expensive option is check and replace the fuses to all 3 systems sometimes a fuse is in the process of blowing or defective or even loose and not properly seated good luck
check refridgerant level most compressors will not operate if the level is low. this being said the a.c. system will and should shut down. also a.c. fan behind radiator may be defective since all fuses are good.