Where is the O2 sensor on an Audi TT?

The O2 sensor on an Audi TT is typically located in the exhaust system. There are generally two sensors: one before the catalytic converter (upstream) and one after it (downstream). To find them, look along the exhaust piping, usually near the engine or close to the catalytic converter. Access may vary depending on the specific model year, so consulting the vehicle's service manual can provide precise locations.