Black smoke and P008700 error in VW Polo

Black smoke from the exhaust usually indicates a rich fuel mixture, meaning too much fuel and not enough air. The error code P008700 suggests a fuel pressure issue. Start by checking your air filter to ensure it's not clogged or dirty, as this could restrict airflow. If the air filter is fine, you may need to have your fuel pressure sensor or fuel pump inspected by a professional, as these could be causing the high fuel pressure. Please update us on your progress. Do you have any other questions?