Reset check engine light on 1993 volvo 960?

To reset the check engine light on a 1993 Volvo 960, you can disconnect the negative battery terminal for about 10-15 minutes, then reconnect it. This will clear the diagnostic trouble codes stored in the system. Alternatively, you can use an OBD-I scanner to read and clear the codes if available. Make sure to address any underlying issues before resetting the light to ensure it doesn't come back on.