{"id":27223,"date":"2026-10-13T15:13:41","date_gmt":"2026-10-13T14:13:41","guid":{"rendered":"https:\/\/www.cathive.co.uk\/?p=27223"},"modified":"2026-10-24T00:17:03","modified_gmt":"2026-10-23T23:17:03","slug":"dpf-fault-codes","status":"publish","type":"post","link":"https:\/\/www.cathive.co.uk\/de\/blog\/dpf-fault-codes\/","title":{"rendered":"DPF-Fehlercodes P2463, P2002, P242F und P2453 erkl\u00e4rt"},"content":{"rendered":"

What does a DPF fault code mean?<\/strong> It tells you which of the engine computer’s checks on the diesel particulate filter (DPF) has failed: too much soot (P2463), too much ash (P242F), a filter that no longer catches enough soot (P2002), or a pressure reading that doesn’t add up (P2452 to P2455, P244A and P244B). BM Catalysts<\/a>, who make every part we sell, say these codes are rarely caused by a faulty DPF1<\/a><\/sup>. Most point to something that stops the filter working, and several point to a sensor or a pipe that costs far less than a filter.<\/p>\n

Below is what each code means, what a garage should check before anything is replaced, and when the answer really is a new filter. How a DPF cleans itself is covered in what is a DPF and how regeneration works<\/a>; this guide starts where the warning light ends, with the code. On many Renault and Dacia models a particle filter fault shows as the message „Check anti-pollution system“: see what it means and what to do<\/a>.<\/p>\n

The codes at a glance<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Code<\/th>\nWhat it means<\/th>\nCheck first<\/th>\n<\/tr>\n<\/thead>\n
P2463<\/strong><\/td>\nToo much soot in the filter<\/td>\nWhy regeneration isn’t finishing; the pressure sensor<\/td>\n<\/tr>\n
P242F<\/strong><\/td>\nToo much ash in the filter<\/td>\nThe pressure sensor and its hoses; then the ash itself<\/td>\n<\/tr>\n
P2002<\/strong><\/td>\nThe filter isn’t catching enough soot<\/td>\nA cracked or failed filter; the pressure sensor<\/td>\n<\/tr>\n
P2452 to P2455<\/strong><\/td>\nA fault in the pressure sensor’s circuit<\/td>\nThe sensor, its wiring and connector, its hoses<\/td>\n<\/tr>\n
P244A, P244B<\/strong><\/td>\nPressure across the filter too low or too high<\/td>\nExhaust leaks near the sensor; leaking or blocked hoses<\/td>\n<\/tr>\n
P2458, P2459<\/strong><\/td>\nRegeneration too long or too frequent<\/td>\nWhy regeneration isn’t working normally<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Where the codes come from<\/h2>\n

A diesel’s on-board diagnostic (OBD) system keeps watch on the DPF. Type-approval law requires it to detect a particulate filter that has failed or been removed, and to record each fault with a standard code from ISO 15031-6 or SAE J2012, two technically equivalent standards2<\/a>,3<\/a><\/sup>. The codes must be readable with standard diagnostic equipment2<\/a><\/sup>, so a code reader and a dealer’s equipment show the same P2463.<\/p>\n

A code is where a diagnosis starts, not where it ends. In BM Catalysts‘ words, a fault code „will not tell you which exact part of the vehicle requires fixing or replacing“, only what needs to be tested1<\/a><\/sup>.<\/p>\n