Toyota Corolla Mass Air Flow Sensor Estimate

Hi I Have 2005 Corolla, I Recently Got Check Engine Light Code 171. Mechanic Said The Maf Sensor Needs To Be Replaced And Costs Around 500...

I Have A 2003 Toyota Corolla With 40,000 Mi And A 4cly Engine. My Check Engine Light Came On And I Had A Mechanic Look At It, He Said He...