my 04 sentry has the service engine light on.
If your vehicle's check engine light (https://www.yourmechanic.com/article/what-does-the-check-engine-warning-light-mean-by-spencer-cates) illuminates, there is a malfunction that should be diagnosed and repaired. If the check engine light is flashing, that means there is a serious fault, such as cylinder misfiring, that requires immediate repair....