How do you reset the ecu on a peugeot 307?

To reset the ECU on a Peugeot 307, you can disconnect the car battery by removing the negative terminal for about 15-30 minutes. This will clear any stored error codes and reset the ECU settings. After reconnecting the battery, start the car and let it idle for a few minutes to allow the ECU to recalibrate. Make sure to check for any stored fault codes afterward, as they may indicate other issues that need addressing.