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Diesel particulate filter (called DPF or FAP) is a filter located just after the turbocharger and is specially designed to reduce the amount of diesel particulate matter (soot / ash). The purpose of this filter is to create cleaner / more environmentally friendly exhaust gases emitted to the atmosphere.

A substantially blocked DPF filter is usually caused by another major problem. It is worth taking further diagnostics to find the reason for this situation.

Things that can lead to blocking the DPF filter:

  • Short trips – vehicles with a large “urban driving” are more prone to blocking because the DPF filter does not reach sufficient temperature. In order for the DPF regeneration process to work efficiently and burn coal deposits, the engine must often reach the correct operating temperature.
  • Damaged / defective sensors – DPF has several sensors that are installed before and after the filter. These sensors are adapted to monitor the initial and final temperatures as well as the back pressure of the filter. If one or more of these sensors fail, the regeneration process may stop running.
  • Defective / Damaged EGR Valve – The EGR valve is designed to recirculate the exhaust gases back to the engine before passing through the DPF. In some cars, if the EGR system is not working effectively or is blocked, the amount of exhaust gas flowing through the DPF will be increased potentially increasing the blocking of the DPF.
  • Faulty / damaged swirl flaps – Like the EGR valve, the swivel flaps are fitted to help control the emissions in the vehicle. If they do not work effectively, it can potentially accelerate DPF blocking.
  • Failed Regeneration – Some conditions must be met before the DPF can regenerate. If we stop this process or these prerequisites are not met, the DPF filter will not regenerate.

P0470 – Exhaust pressure sensor malfunction
P0471 – Exhaust pressure sensor range/performance
P2002 – DPF efficiency below threshold (Bank 1)
P2003 – DPF efficiency below threshold (Bank 2)
P2031 – Exhaust gas temperature sensor circuit (bank 1 sensor 2)
P2032 – Exhaust gas temperature sensor circuit low (bank 1 sensor 2)
P2033 – Exhaust gas temperature sensor circuit high (bank 1 sensor 2)
P2034 – Exhaust gas temperature sensor circuit (bank 2 sensor 2)
P2035 – Exhaust gas temperature sensor circuit low (bank 2 sensor 2)

P2036 – Exhaust gas temperature sensor circuit high (bank 2 sensor 2)
P242F – Dpf restriction – Ash accumulation
P244A – DPF differential pressure too low (Bank 1)
P244B – DPF differential pressure too high (Bank 1)
P2452 – DPF pressure sensor A circuit
P2453 – DPF pressure sensor A circuit range/performance
P2454 – DPF pressure sensor A circuit low
P2455 – DPF pressure sensor A circuit high
P2458 – DPF regeneration duration
P2459 – DPF regeneration frequency
P2463 – DPF Restriction – Soot accumulation

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