P2002 on Volkswagen: Causes, Symptoms and Fix Cost

The Quick Answer above is the generic definition. What follows is the model-specific detail for the Volkswagen models that log P2002.

Beyond the generic causes listed on the main P2002 page, these are the patterns noted for Volkswagen models:

Follow these steps to pinpoint the root cause of P2002:

1. Read all stored codes and the freeze frame with an OBD2 reader. Note whether P244A (pressure too low), P226D (filter missing), P244B or P2463 (pressure too high, soot build-up) sit alongside P2002, because they say whether the filter looks empty or full. A generic OBD2 reader can show these codes, the freeze frame and standard live data, but on most cars not the pressure across the filter, the soot load or the regeneration history, and it cannot run a forced regeneration or an adaptation: those need manufacturer-level software or a workshop.
2. Inspect the pressure sensor hoses and pipes for splits, melted sections, blockage or a loose end, and check that the upstream and downstream hoses are on the right ports. A hose that no longer sees the pressure ahead of the filter makes the filter look cracked or empty while it is fine.
3. Check the exhaust for leaks between the engine and the filter, which also lower the pressure the sensor sees.
4. With manufacturer-level software, read the pressure across the filter at several engine speeds and loads and compare it with the specification for that engine. With the hoses and sensor proven good, a reading well below specification points to a cracked, melted or missing filter; one well above it points to a loaded filter instead.
5. Look for soot where there should be none: a filter that works leaves the tailpipe and the pipe after it largely clean. A workshop can hold a clean cloth over the tailpipe while the engine is revved to see whether soot is getting through; this test is not meaningful straight after a regeneration, when an empty filter traps less.
6. On makes that use P2002 for a loaded filter, such as VW group diesels, a forced regeneration with manufacturer-level software is a legitimate next step once the sensor and hoses are proven good. If it does not bring the pressure back into range, the filter needs cleaning off the car or replacing.
7. A cracked or melted filter has to be replaced; cleaning removes soot and ash but cannot repair the substrate. Before fitting a new one, find what overheated or overloaded the old one (leaking injectors, a faulty exhaust fuel injector, repeatedly interrupted regenerations) and confirm the engine oil meets the low-ash specification, then have any adaptation the engine computer requires done with manufacturer-level software.

Estimated repair costs for P2002 in EUR, compiled across makes. Volkswagen costs typically sit in the middle of each range.

These codes are often seen alongside P2002 or point to related issues, on any make: