Why does my Dodge Caliber idle at 1500 rpm and engine lites on?

If your Dodge Caliber is idling at 1500 RPM and the engine light is on, it may indicate a few potential issues. Common causes include a vacuum leak, a malfunctioning throttle position sensor, or a problem with the idle air control valve. It's essential to use an OBD-II scanner to check for any stored trouble codes, which can help pinpoint the specific issue. Addressing the underlying problem is crucial to avoid further engine damage and to restore proper idle speed.