How can I turn off Check Engine light on 1992 vanden plas if the vcm doesn't show any codes what could be the problem?

If the Check Engine light remains on and the Vehicle Control Module (VCM) doesn’t show any codes, it could be due to a few issues. First, check for loose or damaged wiring and connectors related to the engine sensors, as these can cause intermittent issues not captured in the codes. Additionally, the light may need to be reset manually with an OBD I scanner or by disconnecting the battery for a few minutes. If the problem persists, consider consulting a professional to diagnose potential underlying issues such as vacuum leaks or faulty sensors.