The Check Engine Light may illuminate because the mass air flow sensor sends incorrect information to the engine control computer. This can cause a loss of power on acceleration. A failed mass air flow sensor will require replacement.Google+
Car Problem Reports
Lexus ES300 Check Engine Light and Lack of Power Due to Failed Mass Air Flow Sensor
Lexus ES300 Problem
Average Mileage: 121,000 mi (89,000 mi - 161,000 mi)
Visitor, 1995 Lexus ES300, 125,000 mi
car was running sluggish then cut off would not go in drive or reverse. Mechanic replaced the mass air flow sensor
check engine light comes on and car rides very low and power is slow.