
2021 Audi A6L does not have a particulate filter. Currently, among Audi models, vehicles equipped with the EA888 engine, except for the DKW and DKX models, are equipped with particulate filters; vehicles with the EA211 engine also have particulate filters. To check whether a vehicle has a particulate filter, you can use the following three methods: Check the and to see if there is a particulate filter function. Additionally, you can carefully check the fault codes in the manual to see if there is a "Particulate Filter" warning light indicator. Check the label on the oil cap. If the oil cap clearly indicates 0W-20 grade oil, it means the vehicle is equipped with a particulate filter. Check if there is a cylindrical section on the exhaust pipe behind the three-way catalytic converter. If there is, that is the particulate filter. Location of the particulate filter: The particulate filter is located behind the three-way catalytic converter and in front of the muffler, surrounded by the front and rear oxygen sensors.


