How can I troubleshoot low coolant level in my Audi A1?

Recently, my Audi A1 has been consistently low on coolant. I've checked for leaks and haven't found any. What are some steps I can take to troubleshoot and address this issue?

The first thing you should check is your coolant level sensor. If it's faulty, your coolant level may appear low when it's actually not. You can try cleaning or replacing the sensor to see if that resolves the issue.

Another possibility is an air pocket in your coolant system. This can happen if you recently changed your coolant or if there's a leak somewhere in the system. Bleeding the air out of the system can help alleviate the problem.

A common cause of low coolant level is a faulty radiator cap. The cap is responsible for maintaining pressure in the coolant system, so if it's not functioning properly, coolant can leak out. Consider replacing the cap to see if that solves the issue.