Audi Audi RS4 2018-present Emissions & Sensors Specifications

The 2018-Present Audi RS4 is equipped with a combination of oxygen sensors (O2 sensors) and nitrogen oxide (NOx) sensors. The O2 sensors are located both upstream and downstream of the catalytic converters, while the NOx sensors are positioned downstream of the selective catalytic reduction (SCR) system. These sensors are critical for monitoring exhaust gas composition and ensuring compliance with Euro 6 emissions standards.

Audi recommends inspecting emissions sensors during every scheduled maintenance interval, typically every 10,000 miles or 12 months, whichever comes first. Replacement intervals vary based on sensor type and usage, but O2 sensors generally last 60,000-100,000 miles, while NOx sensors may require replacement every 80,000-120,000 miles. Always refer to the vehicle's service manual for specific guidance.

Common symptoms of a failing emissions sensor include illuminated check engine light (CEL), reduced fuel efficiency, rough idling, poor engine performance, and increased emissions. Diagnostic trouble codes (DTCs) such as P0130 (O2 sensor circuit malfunction) or P2201 (NOx sensor circuit range/performance) may also be logged in the vehicle's ECU.

While it is possible to replace emissions sensors yourself, it is highly recommended to consult a certified Audi technician. Proper installation requires specialized tools, such as an O2 sensor socket, and knowledge of the vehicle's exhaust system. Incorrect installation can lead to damage, improper sensor readings, and voided warranty coverage.

The O2 sensors in the Audi RS4 operate optimally between 300°C (572°F) and 800°C (1472°F), while NOx sensors function best between 200°C (392°F) and 500°C (932°F). These sensors are designed to withstand the high temperatures of the exhaust system and provide accurate readings under varying driving conditions.