Buy OEM 1999 Audi Part # 1K0998262T. Oxygen Sensor (Rear). Oxygen Sensor - Repair or Replace A failed Oxygen Sensor will often have no noticeable symptoms beyond a check

Oxygen (O2) Sensor KT.
750mm Harness. From Chassis/VIN 1K-9-172 726. Oxygen Sensor. To Chassis/VIN 1K-9-172 725.

Oxygen Sensor

Fits A3, A4, A5, A6, allroad, Q3, Q5, Q7, S4, TT RS

Oxygen Sensor - Repair or Replace
A failed Oxygen Sensor will often have no noticeable symptoms beyond a check engine light, but it does cause your 1999 Audi to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Audi genuine parts.