Know what the guidance applies to.
Our guides explain DPF service decisions in plain language and link to the technical material behind them. Your specific vehicle still needs its own service information and diagnosis.
Start with the source and the application.
The guides draw on manufacturer manuals, service bulletins, component information and public technical guidance. Source links accompany the articles so you can check the original context.
A manual for one engine generation does not establish the procedure for every diesel. Look at the model, engine, emissions system and publication date before applying an example to your equipment. Current manufacturer instructions for the exact application take precedence over a general explanation on this site.
Separate explanation from diagnosis.
The content can help you understand the difference between soot and ash, compare service scope or read a filter report. It cannot inspect your filter, interpret every fault combination or determine whether a vehicle is safe to keep operating.
Warning messages and service procedures differ. Follow the applicable operator instructions and have the vehicle evaluated when required. A guide describing regeneration is not permission to initiate a forced regen on an undiagnosed vehicle.
Read a measurement in context.
A figure is useful when its meaning is clear. Flow, restriction, weight and inspection findings describe different aspects of a component. Test conditions, units and the appropriate acceptance criteria matter. An improvement in one measurement does not establish every aspect of filter performance or remaining life.
Similarly, an example interval or repair condition is tied to its source. Use the guides to identify the right questions for the vehicle and its service history.
Help us correct an error.
If you find a wrong statement, a broken source link or information that no longer matches the manufacturer’s guidance, send a correction request. Include the page address, the passage in question and the relevant publication or vehicle application.
For a question about your current repair, call (801) 268-0919 or submit a service request with the vehicle details and symptoms. That lets the conversation begin with the job in front of you.
Explore the DPF guides