Audi Audi A3 2013-2020 Emissions & Sensors Specifications

The emissions sensors in the 2013-2020 Audi A3 include oxygen sensors, temperature sensors, and particulate matter sensors. These sensors are designed to work with the 1.4L, 1.8L, 2.0L, and 2.0L TDI engines. They are compatible with Euro 5 and Euro 6 emission standards. The oxygen sensors are heated to ensure accurate readings, and the particulate matter sensors monitor soot levels in diesel models. Compatibility varies by engine code, so ensure the correct part number for your specific vehicle.

Regular maintenance for emissions sensors includes checking for faults via the OBD-II system and ensuring proper connections. Oxygen sensors should be replaced every 100,000 miles or as indicated by the manufacturer. Diesel particulate filters (DPF) should be cleaned or replaced every 50,000-100,000 miles, depending on driving conditions. Sensors should be inspected for soot, oil, or coolant contamination, which can cause premature failure.

To replace an emissions sensor, locate the sensor based on the fault code (e.g., oxygen sensor upstream/downstream). Disconnect the battery, remove the electrical connector, and unbolt the sensor. Use a wrench to remove the sensor from the exhaust system. Install the new sensor by reversing the steps, ensuring a tight seal. Clear any fault codes using an OBD-II scanner and test drive the vehicle to ensure proper operation.

Start by scanning for fault codes using an OBD-II scanner. Common codes include P0130 (oxygen sensor circuit low) or P0401 (exhaust gas recirculation flow insufficient). Check the sensor electrical connections for corrosion or damage. Inspect the exhaust system for leaks or blockages. For oxygen sensors, test the voltage signal to ensure it fluctuates between 0.1-0.9V. Replace the sensor if it fails to respond to changes in exhaust gas composition.

Ensure proper engine tuning and maintain correct fuel injection and ignition timing. Avoid using low-quality fuels that can contaminate sensors. Regularly clean or replace the air filter to prevent debris from reaching the sensors. For diesel models, perform regeneration cycles for the DPF when prompted by the dashboard warning light. Use a high-quality oxygen sensor cleaner if recommended by the manufacturer, but avoid harsh chemicals that could damage the sensor element.