How do you reset check engine light on 2003 impala?

To reset the check engine light on a 2003 Chevy Impala, you can disconnect the negative battery terminal for about 10-15 minutes. This will clear the engine control module's memory. Alternatively, you can use an OBD-II scanner to read and clear the trouble codes, which will also turn off the check engine light. Keep in mind that if the underlying issue isn't resolved, the light may come back on.