Kwiksen O2 Oxygen Sensor 234-4809/16121 for Downstream 2000-2006 Audi TT Quattro COMPATIBLE WITH OEM: 234-4809,16121 Rear Sensor O2 for Volkswagen Beetle Golf Jetta Phaeton Downstream O2 Senso for 2000-2006 Audi TT Quattro Length (Sensor to Lead): 950 mm (37.40 inch) Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility before purchase.