How to Repair a Diesel Particulate Filter Fault?
2 Answers
Pull out the particulate filter sensor and replace it with a new one to check if the fault persists. If replacing the sensor does not resolve the issue, it indicates that the problem lies with the filter itself. Clean the internal carbon deposits or directly replace the filter with a new one.
I've repaired many diesel vehicle particulate filter issues, usually caused by clogging. First, use a diagnostic scanner to check the trouble codes to see if the sensor is faulty or if there's an actual blockage. For mild clogs, letting the system perform an automatic regeneration is sufficient—just drive at a steady speed on the highway for about half an hour, and the system will heat up to burn off the particles. If regeneration fails, the filter must be removed and cleaned with professional high-pressure equipment or chemical soaking, which is more cost-effective than replacing it. Regular long-distance driving helps prevent clogging, as short trips tend to accumulate carbon deposits. In severe cases, replacing the filter is the only option—it's not cheap but prevents engine damage. Also, ensure the diesel fuel quality is good, as poor-quality fuel accelerates clogging. For diagnosis and repairs, go to a reputable shop; don't risk damaging other components to save money.
