Diesel particulate filter
Traps soot particles from diesel exhaust.
In a diesel after-treatment assembly.
Trapped soot is reduced through regeneration when conditions permit; ash is a different, persistent residue.
A soot-catching filter that needs controlled cleaning.
Warnings or back-pressure faults may involve drive pattern, sensors, temperature or engine faults.
Condition, contamination, operating pattern and the underlying engine matter more than a universal age limit.
Sensors and joints differ greatly from complete after-treatment assemblies. First repair the cause of contamination or abnormal combustion.
BMW diesel regeneration depends on the complete emissions and engine system, not simply driving faster.
Equipped BMW diesel models, according to engine, production date and market. Not a petrol exhaust filter.