Buy OEM 1986 Audi Part # 4H0907807L (4H0-907-807-L, 4H0907807A, 4H0907807G). Sensor. Oxygen. (Front, Rear). A8; 3.0L; TDI; Front. DIESEL, SENSORS, front. Oxygen Sensor - Repair or Replace A failed Oxygen Sensor

A Sensor which detects the amount of Nox in the exhaust system. Oxygen Sensor. Ft. Nitrogen Oxide (NOx).

Nitrogen Oxide (NOx) SensorOxygen Sensor

Fits A8

A8; 3.0L; TDI; Front. DIESEL, SENSORS, front.
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 1986 Audi to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Audi genuine parts.