2008 Chevy Equinox check engine light, service stabilitrak and traction control

What is your question?

check engine light , service stabilitrak and traction control light have been on for three years and i've taken it to several mechanics and not one of them can tell me what the issue is. So tired of putting money into this car. It's a 2008 with 84,000 miles. Had the egr valve changed not once but twice, spark plugs have been changed, sensors have been changed on the tires. And the lights still stay on. I've even taken it to the Chevy dealer. Anyone have any suggestions besides don't ever buy a Chevy?