Buy OEM 1990 Audi Part # 4G0907807P (4G0-907-807-P, 4G0907807AH, 4G0907807C). Sensor. (Rear). A6; 3.0L TDI; Rear. A7; Rear. NOX-SENSOR; A7; 3.0L TDI; Rear. Oxygen Sensor - Repair or Replace A failed Oxygen Sensor

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

Nitrogen Oxide (NOx) SensorOxygen Sensor

Fits A6, A7, A7 Sportback

A6; 3.0L TDI; Rear. A7; Rear. NOX-SENSOR; A7; 3.0L TDI; Rear.
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 1990 Audi to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Audi genuine parts.