How to Clean the Throttle Body in the Audi A4

1. Remove the air duct tube from the throttle body. You will need to unscrew the hose clamps to remove the tube.
2. Spray throttle body cleaner onto the throttle body, both inside and out. Allow it to liberally cover the throttle body and butterfly valve but avoid the throttle body sensors.
3. Wipe off the throttle body cleaner using a clean rag. Use a toothbrush to get the smaller areas that the rag cannot easily reach.
4. Repeat Steps 2 and 3 until the Audi's throttle body is completely clean.
5. Reattach the air duct hose and tighten the hose clamp.