The check engine light can signal anything from a loose gas cap to a failing sensor. Even if the vehicle feels normal, the underlying issue can worsen, so scanning the code is important.

Shaking can be caused by worn engine mounts, ignition problems, or fuel delivery issues. A diagnostic check identifies which system is causing the rough idle.

Most diagnostics take 30–90 minutes depending on the complexity of the issue. Electrical or intermittent problems may require more in-depth testing to find the root cause.