Mitsubishi L200 P1498 & P2463 DPF Overloaded

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Fixing a Mitsubishi L200 DPF Issue

Mitsubishi's L200 is a reliable workhorse, but like any vehicle, it can encounter problems. One issue that can be particularly frustrating is a blocked Diesel Particulate Filter (DPF). This post walks through the process of diagnosing and fixing a DPF issue on a 2018 Mitsubishi L200, addressing fault codes P2463 (DPF accumulation) and P1498 (DPF overloading). If you're facing similar issues, this guide might just give you some insight.

When the vehicle arrived, the customer mentioned a lack of power. The truck wouldn’t rev above 2,000 RPM under load, confirming it was stuck in limp mode. However, there wasn't an engine warning light, which is unusual for such faults. The customer had already spent hours trying to get the problem solved locally without success. Let's dive into what was done to sort it out.


Plugging In and Diagnosing the Issue

The OBD port on the vehicle is located under the dashboard. Using the THINKSCAN 689 BT diagnostic tool, the fault codes P2463 and P1498 were retrieved. These showed DPF accumulation and blockage, confirming the customer's suspicion. At 80,000 miles on the clock, it raised questions about why the blockage occurred—was it due to poor driving habits, high mileage, or other mechanical issues like ash build-up?

To get a better understanding of the situation, live data was explored. The soot levels and differential pressure readings indicated that the DPF was indeed clogged. The next step was to determine whether external causes—like oil dilution—might be contributing to the problem.


Common Issues with Japanese Cars and Oil Dilution

A common trait of many Japanese vehicles, including Mitsubishi, is engine oil dilution problems. Over time, excess diesel can mix with the engine oil, increasing its level. This happens more when DPF regeneration attempts fail repeatedly. On this L200, the oil was above the maximum level, though not dangerously high.

An important point to remember is that many vehicles, especially Japanese models, won’t regenerate the DPF if the oil level is above the max mark. This was addressed by removing some oil to bring it back within an acceptable range.


Cleaning the DPF

With the oil level sorted, it was time to clean the DPF. On the L200, the DPF pressure sensor and pipes are easily accessible, with separate pre- and post-DPF pressure pipes. Cleaning fluid was injected using a compressor to ensure the filter was thoroughly flushed. Care was taken not to overfill the DPF with cleaning fluid, as this can back up into the engine cylinders.

Once the cleaning fluid had been applied, the engine was run at higher revs to help expel the soot build-up. A noticeable drop in pressure readings confirmed the cleaning process was effective.


Resetting the System

After cleaning, resetting the vehicle's systems is critical. This includes:

Resetting the DPF exchange: Most vehicles need confirmation that the DPF has been replaced or cleaned before enabling normal operations.
Resetting the oil level data: If the system believes the oil is still contaminated or overfilled, it may block further DPF regenerations.

Using a second diagnostic tool proved helpful here. Sometimes, different tools handle specific tasks better. In this case, the alternative tool was successful in completing the resets after the initial tool struggled. This is a good reminder why having multiple diagnostic devices can save time.


Testing the Vehicle

With the DPF cleaned and the resets completed, it was time to test the L200. On a short test drive, the vehicle's power was restored, and it was able to rev freely again. No fault codes reappeared, and live data showed acceptable ranges for differential pressure across the DPF.

One interesting observation was the coolant temperature, which stayed around 80°C. While this is borderline for normal operation, it didn’t seem to impact performance. However, it may point to a potential issue with the thermostat, worth monitoring in the future.


Final Thoughts

If there’s one takeaway, it’s that blocked DPFs can often be fixed with proper cleaning and attention to related systems like oil level and sensors. This case also highlights the importance of using the right diagnostic tools and being ready to adapt if one tool doesn’t work well with a particular vehicle.

For anyone dealing with similar issues, don’t overlook the basics. Check for oil dilution, clean the DPF properly, and make sure all related resets are completed. And if you're using diagnostic tools, having at least two different brands can save you a lot of headaches.

The customer drove away with a restored L200 and, hopefully, peace of mind. Hopefully, this guide helps others facing similar challenges with their Mitsubishi or other vehicles.