OBD2 scanners are excellent tools for identifying issues in your vehicle, but what most drivers don’t realize is that some of the codes that appear on the screen don’t just signal a temporary fault – they often indicate a systemic problem. In diesel vehicles, this usually relates to the DPF (Diesel Particulate Filter) and AdBlue (SCR) systems – especially if the car has high mileage or is driven under heavy conditions.


Here are the most common OBD2 error codes that suggest it may be time to consider removing the DPF or AdBlue system.


P2002 – DPF Efficiency Below Threshold

One of the most common errors in vehicles with a diesel filter is code P2002. It means the computer is detecting that the DPF is not effectively filtering soot. This typically occurs after the filter becomes clogged or when regeneration fails.


Typical symptoms include increased fuel consumption, loss of power, sluggish acceleration, and frequent "Check Engine" light warnings.


Possible solutions:

  • Temporary: cleaning or regeneration (if the condition allows)

  • Permanent: software removal of the DPF in cases of recurring issues


P2463 – DPF Soot Accumulation Too High

This code directly indicates that soot levels in the filter are critically high. In this scenario, regeneration is often no longer possible, and the vehicle may enter limp mode with limited power and reduced speed.


In such cases, even professional machine cleaning may not be enough, especially if the DPF is physically damaged.


When DPF removal is a logical choice:

  • When the issue has occurred repeatedly

  • In vehicles over 200,000 km with frequent urban driving

  • In out-of-warranty cars where the cost of repair exceeds the vehicle’s value


P204F – Reductant System Performance

This code relates to the malfunction of the AdBlue system – often caused by issues with the pump, pressure sensor, fluid levels, or crystallization in the injectors. If this error recurs, it’s one of the clearest signs that the SCR system is unstable.


What happens if not resolved:

  • In most models – countdown to engine lock

  • In heavy-duty vehicles – forced RPM and power limit


P20E8 – Reductant Pressure Too Low

This error means the pressure in the AdBlue injection system is below acceptable levels. It’s most commonly due to a faulty pump or a clogged filter. In some models (e.g., Opel, Peugeot, Mercedes), this error can result in the vehicle becoming non-startable after a certain time.


The issue usually can’t be resolved with a simple fluid refill or basic cleaning.


In practice, users often choose an emulator or software removal to avoid recurrence


P242F – DPF Restriction – Ash Accumulation

Unlike soot, ash cannot be burned off during regeneration. It’s caused by additives in oil and fuel, and over time it builds up irreversibly in the DPF. Code P242F signals that the filter’s physical capacity has been reached and it cannot be regenerated.


In this case:

  • Replacing the DPF may be costly

  • An alternative is software removal and physical core removal

  • This is common in out-of-warranty or second-hand vehicles from Western Europe


What do these errors mean for you?

The appearance of any of these errors doesn’t always require system removal, but it almost always indicates a serious problem that won’t go away on its own. If the error has occurred repeatedly, if the vehicle has already undergone cleaning or component replacement, or if you’ve experienced limp mode – most likely, the solution is a permanent software intervention.


What does CarHack offer?

If you’ve encountered any of the listed errors or feel that your vehicle is suffering from issues related to the DPF or AdBlue system, we at CarHack are here to provide a professional solution – fast, reliable, and tailored to your vehicle.


We perform software removal of DPF, AdBlue, and EGR using proven methods and original interfaces, ensuring compatibility with all ECU systems – whether Bosch, Delphi, Siemens, Denso, Continental, or others. Our services cover passenger cars, vans, trucks, agricultural, and construction machinery.


We also offer:

  • Professional on-site diagnostics

  • Emulator installation for heavy-duty vehicles

  • Customized solutions based on the specific problem and car model

  • Guaranteed error removal with no risk of reappearance


Whether you’re looking for a permanent solution to recurring faults or need a professional consultation regarding your vehicle’s condition, visit us or contact our team. At CarHack, you’ll receive not just a service, but expert care, clear communication, and a solution that works.