How can you clear a light in Volvo S40 without an expensive tr?

Clearing a light in a Volvo S40 without an expensive trip to the mechanic can be done by reprogramming the car's computer. To do this, you will need an OBD-II scanner and a laptop with the appropriate software.

1. Connect the OBD-II scanner to the car's diagnostic port, which is usually located under the dashboard.

2. Start the laptop and open the software.

3. Select the "Engine" or "Powertrain" module from the software menu.

4. Look for the trouble code that corresponds to the light that is on.

5. Once you have found the trouble code, select the "Clear" or "Delete" option from the software menu.

6. The light should now be cleared.

If the light does not clear, or if you are unable to find the trouble code, you may need to take the car to a mechanic.