1. Locate the Diagnostic Link Connector (DLC) on the vehicle. In the 2003 Astro, it is usually found under the driver's side dashboard.
2. Connect a scan tool or code reader to the DLC.
3. Turn on the ignition without starting the engine.
4. Using the scan tool or code reader, select the appropriate option to clear or reset the check engine light.
5. Follow any additional instructions provided by the scan tool or code reader to complete the process.
6. Once the check engine light has been cleared, turn off the ignition and disconnect the scan tool or code reader.
7. Start the engine to verify that the check engine light remains off.
If the check engine light returns after clearing, it indicates an ongoing issue with the vehicle's emission control system or engine performance. In such cases, it is recommended to have the vehicle diagnosed by a qualified mechanic to identify and address the underlying problem.
