How do you reset the emission fault light in a Volvo 2008 V70?

To reset the emission fault light in a 2008 Volvo V70, you can use an OBD-II scanner to clear the diagnostic trouble codes (DTCs) that triggered the light. Simply plug the scanner into the OBD-II port, read the codes, and follow the prompts to erase them. Alternatively, you can disconnect the battery for a few minutes, which may also reset the light. However, it's essential to address any underlying issues that caused the light to come on to prevent it from returning.