Regular maintenance of the exhaust system includes cleaning which component?

• A. Catalytic converter
• B. Diesel particulate filter
• C. Muffler
• D. Oxygen sensor

Answer: (B)

Diesel exhaust systems are designed to remove soot from the exhaust, and that responsibility falls to the diesel particulate filter. Over time, soot accumulates in the filter and can clog it, which increases exhaust backpressure, hurts engine performance, and can trigger warning lights. Regular maintenance focuses on cleaning or regenerating the filter so it can burn off the trapped soot, restoring proper flow and emission control. The other components serve important roles—like reducing pollutants (catalytic converter), carrying exhaust out of the vehicle (muffler), or monitoring exhaust gases (oxygen sensor)—but they’re not routinely cleaned as part of standard maintenance.