fault code 4
I have a 90 300E w/150k mi. Recently "check engine" light has came on and wouldn't go away. I checked the fault code at the diagnostic box w/led light. The light flashed 4 times. The fault code#4 is related to Air flow sensor, I believe. Anybody have any idea what does this code mean. The car is still runing fine even with the "check engine" light came on.