The engine's differential pressure sensor is providing inaccurate data.

[jameswright77]

I utilised my Icarsoft Pro to identify the problem (DPF 400%) after the warning light on my S204 turned on; otherwise, all of the readings were excellent. I find this surprising because my Mercedes is usually reserved for extended road trips. I had the same thought: I really need a DPF pressure differential sensor. Since Mercedes has swapped it out previously, it's no surprise that they've stashed it in an awkward spot. After I installed the new one, I saw that the old sensor's plastic hose ends were blocked with a white gunge-like substance. I suppose that this was caused by condensation, since the car is only occasionally used for lengthy excursions. I went for a drive after clearing the code and immediately after 30 miles, the engine light came on. I stopped, examined the DPF, and the soot fill was still 400%. I replaced the DPF using my Icarsoft Pro, and now all readings are good. It seems that the weather is becoming colder and wetter, and condensation has reached the sensor, causing it to give a false signal of 400%. I could have gotten away with only cleaning the sensor tubes, but replacing it is such a headache that I just ordered a new one. It was worth considering when replacing this sensor because the DPF wasn't full. Before you find out it will cost a pretty penny at the garage, I hope this helps someone.

[STAR89colin]

The pipes leading to the sensor can be clogged.

[almamater78]

It is recommended that you direct compressed air into the pipe leading to the dpf and dpf cleaning.

There will be a sensor error if the sensor fails. It is not enough to simply remove the error code; you will also need to educate the sensor again using your diagnostics when you replace it.

[jameswright77]

Due to their short length (150 mm), I blew out the pipes and injected DPF cleaner into the DPF through them. White gunge filled the plastic tubes of the sensor. There's no use in installing a DPF as they produce the same amount of soot as a vehicle without one.They simply do it at various times.

[jameswright77]

I simply wanted to demonstrate that if other readings, such as exhaust back pressure, are normal, it's likely that the DPF pressure differential sensor is faulty. The removal of the sensor will reveal whether or not there is a blockage in the little tubes that connect the DPF to the sensor. I did state that I had recorded the installation of a new DPF, even if one hadn't been reset. Simply said, if the soot content unexpectedly skyrockets while all other readings are within acceptable ranges, the sensor is probably to blame. Changing the sensor, which should only take 45 minutes and cost £10 to £15 on eBay, should fix the problem. A vast improvement over having a mechanic fiddle with the numbers to estimate how much the bill will be

[jameswright77]

[almamater78]

Good luck if you bought a sensor on eBay for fifteen pounds.
Firsthand knowledge of merc sensors... You're back to your old tricks if you buy fake.
The gen merc sensor weighs 80 pounds.


There is an error code that comes from a malfunctioning diff press sensor. The push sensor was accidentally moved out of range.

[almamater78]

I don't see why you would tell the automobile it has a new dpf when it is utilising the 400% blocked dpf.

[MercedesMan98]

They wouldn't have much use if they did. At very high soot levels, a Diesel Particulate Filter (DPF) regeneration is activated, which involves burning off the collected soot. The soot is reduced to a minimal quantity of ash and gas by heating the exhaust gas to a temperature of around 500 to 600°C. When everything is running well, no soot is expelled.

[almamater78]

The person posting appears a bit agitated because he is experiencing automotive problems.
When their environment is optimal, DPFs function as intended. This is the problem!