How to Remove a Catalytic Converter on an Audi TT


1. Pop the hood. Remove the air-intake tubing from the engine bay using the flat-head screwdriver. Pull the air box up and out of the engine bay. Unbolt the exhaust manifold at the front of the car from the forward exhaust section--which is the section that contains the catalytic converter--using the 3/8-inch ratchet, extension and sockets.
2. Lift up the front of the car with the jack. Put it down on the jack stands and then remove the jack.
3. Locate the oxygen sensors on the forward section of the exhaust, which are cylinders, one-half inch by three inches, that have electrical connections on them. Unplug the harness from the oxygen sensor using your hands.
4. Unbolt the forward section of the exhaust, including the catalytic converter, from the rest of the exhaust using the 3/8-inch ratchet and socket. Lower the forward exhaust section away from the car.