the service engine, service vechile soon, trac, and anti lock light is on. on 2000 Buick Century

took it to the shop and the code came up as a mass airflow. i had it replaced and the lights came right back on. the shop said it could be a defective mass airflow and replaced it a second time...... the lights are still on, the car runs fine any ideas?

Asked by for the 2000 Buick Century
take it back to the shop and have them scan test it for codes
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ive changed the bearin hub assembly on both sides and all new brakes pads an calipers on both sides but the light remains on could it be the abs brake controle modrule