2021 Diesel Particulate Filter Replacement Cost How much does a Diesel Particulate Filter Replacement cost? Price Guide Thirty years ago, driving a vehicle powered by diesel fuel typically meant driving a car or truck that habitually released plumes of black smoke and heavy emissions. Today, environmental rules have sharply reduced the problems from diesel fuel usage. One of the systems in place in diesel-powered vehicles is DPF or Diesel Particulate Filters that are part of the exhaust system and trap harmful particulates from being released outside the vehicle. However, the filters themselves may become so saturated with particulates that they must be professionally cleaned and/or replaced. In this guide, we will consider DFF replacement costs and how you can have that work expertly done. And if you are a DIY person, you need to know that it is against the law to modify or remove the Diesel Particulate Filters on any vehicle, meaning professional help is required for this task.