How do I reset the tire pressure warning light on my Audi A1?

I recently replaced my tires on my Audi A1 and now the tire pressure warning light won't turn off. How can I reset it?

Hannah, try checking your tire pressure again and make sure they are all inflated to the recommended pressure. If that doesn't work, try disconnecting the battery for a few minutes and then reconnecting it. This usually resets the warning light. If the light still won't turn off, you may need to take it to a mechanic to have them reset it with a diagnostic tool.