The best way to Reset Codes in a 2004 325Ci 1Park the car and turn off the engine. Leave the key in the ignition and turn it back for the “ON” or “RUN” position so the dashboard lights illuminate.2Open the driver’s side door and exit the car. Shine a work light inside the driver’s side foot well area and locate the diagnostic communications port, or DCP.
The DCP is mounted for the underside of the dashboard, rectangular in shape, and is made from black plastic.3Connect one end of the data cable supplied with your scan tool towards the DCP. Connect the other end towards the scan tool. Press the power button on the scan tool and wait for it to power up.4Navigate through the scan tool menu for the trouble codes section.
Each scan tool has a different menu structure depending upon the manufacturer and options Obd2 scanner, but the functions are generally the same.5Select the option to clear all of the trouble codes and then wait while the scan tool performs this task. Depending upon your exact tool, this can take as little as few seconds or as long as a few minutes.6Navigate back towards the main menu screen and power down the scan tool. Disconnect it from the DCP and start the engine. Note the gauge cluster; if the codes have been cleared there should be no warning or service engine lights illuminated auto diagnostics software.
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