How do you reset the engine control module in your 1996 Geo Metro?

To reset the engine control module (ECM) in a 1996 Geo Metro, you can disconnect the negative terminal of the battery and leave it off for about 15-30 minutes. This will allow the ECM to reset and clear any stored trouble codes. Afterward, reconnect the battery terminal and start the vehicle, allowing the ECM to re-learn the engine parameters. If issues persist, it may be necessary to check for underlying problems or consult a mechanic.