Cool Check Engine And Traction Light On Toyota Highlander 2023. Web tripleaech · #3 · feb 21, 2022. The service guy quoted from the tech that sometimes the battery isn’t hooked up the way it needs to be and that’s what’s probably setting off the ‘check engine & traction control light’.

If you found this answer helpful, please help me by leaving a rating using the stars at the top of the page or click 'accept'. What vangm25 said, however i'd clarify that you should reseat the plugs (unplug again and plug back together) to ensure all connections are good. A loose gas cap faulty oxygen sensor damaged catalytic converter

