If the diesel particulate filter is not cleaned, what is a likely consequence?

• A. Loss of power
• B. Increased fuel economy
• C. Cleaner exhaust
• D. No engine issues

Answer: (A)

Diesel particulate filters trap soot from exhaust, and they need regular regeneration or cleaning. If the filter is not cleaned, soot builds up and creates a restriction in the exhaust flow (backpressure). That makes it harder for the engine to push exhaust out, so the engine control system reduces power to protect the engine. So you’ll notice a loss of power. Increased fuel economy would not occur, the exhaust won’t be cleaner, and ignoring maintenance can lead to engine warnings or other issues rather than no problems at all.