RosaStyle Posted Tuesday at 08:46 AM Share Posted Tuesday at 08:46 AM The warning light activated on my S204, prompting me to use my Icarsoft Pro to diagnose the issue, which indicated a DPF reading of 400%. All other parameters were OK. This is peculiar, as my Mercedes is mostly utilised for long-distance travel. A DPF pressure difference sensor is once again required, I believe. Indeed, Mercedes has concealed it in a challenging location, since it has been replaced before. I changed it and then illuminated the ends of the previous sensor plastic hose to see that they were obstructed by a white sludge, which I presume is a result of condensation, given the car is used seldom for lengthy excursions. I cleared the code and had a drive, during which a regeneration started immediately. After around 30 miles, the engine light illuminated, prompting me to stop and examine the DPF soot level, which remained at 400%. I recorded that I changed the DPF using my Icarsoft Pro, and all readings are now OK. It seems that as the weather becomes colder and wetter, condensation has reached the sensor, resulting in a misleading measurement of 400%. I could likely have managed by only cleaning the sensor tubes; but, replacing them is somewhat cumbersome, so I opted for a new one instead. It is advisable to examine this sensor replacement, since the DPF was not at full capacity. I hope this information becomes beneficial to someone before to incurring substantial expenses at a garage. Link to comment Share on other sites More sharing options...
Darthilli Posted Tuesday at 08:47 AM Share Posted Tuesday at 08:47 AM Potential obstruction in the pipes leading to the sensor. Link to comment Share on other sites More sharing options...
SushySosa Posted Tuesday at 08:47 AM Share Posted Tuesday at 08:47 AM One should direct compressed air into the pipe leading to the DPF and the DPF cleaning. A malfunctioning sensor will result in a sensor fault. Upon replacing the sensor, it is necessary to recalibrate it using your diagnostic tools. Merely deleting the error code will be inadequate. Link to comment Share on other sites More sharing options...
RosaStyle Posted Tuesday at 08:47 AM Author Share Posted Tuesday at 08:47 AM I purged the pipes and introduced DPF cleaner into the DPF, since they measure barely 150mm in length. The plastic tubes on the sensor were filled with a whitish substance. DPFs are entirely ineffective, since they emit an equivalent amount of soot as vehicles without such systems.They just execute it at varying intervals. Link to comment Share on other sites More sharing options...
RosaStyle Posted Tuesday at 08:48 AM Author Share Posted Tuesday at 08:48 AM My essay aimed to demonstrate that a malfunctioning DPF pressure differential sensor may be diagnosed by examining other metrics, such as exhaust back pressure; if the latter is satisfactory, it indicates that the DPF is not entirely compromised. A obstruction may exist in the small tubes connecting the DPF to the sensor, however this will be assessed upon sensor removal. I indicated that I had recorded the installation of a new DPF, despite the fact that one had not been installed, just for the purpose of resetting. If the soot content dramatically increases while all other readings remain normal, the most probable issue is the sensor. Replacing it will likely take 45 minutes and cost between £10 and £15 from eBay. Significantly preferable to having a garage pondering while disclosing the magnitude of the charge. Link to comment Share on other sites More sharing options...
SushySosa Posted Tuesday at 08:48 AM Share Posted Tuesday at 08:48 AM If you purchased a sensor for 15 pounds on eBay, then best of luck. My experience with merc sensors. Purchase non-genuine items, and you will be repeating the task. The Gen Merc sensor weighs 80 pounds. An faulty differential pressure sensor will generate its own error code. Faulty differential pressure sensor out of range. Link to comment Share on other sites More sharing options...
SushySosa Posted Tuesday at 08:48 AM Share Posted Tuesday at 08:48 AM Why would you inform the vehicle that it has a fresh DPF while using a DPF that is 400% blocked? Link to comment Share on other sites More sharing options...
MagicPod Posted Tuesday at 08:49 AM Share Posted Tuesday at 08:49 AM Indeed, they do not; otherwise, they would lack purpose. In a Diesel Particulate Filter, accumulated soot is incinerated during DPF regeneration, initiated when soot concentrations exceed permissible limits. This procedure involves elevating the exhaust gas temperature to about 500-600°C to transform the soot into minimal quantities of ash and gas. Soot remains contained if it is functioning correctly. Link to comment Share on other sites More sharing options...
SushySosa Posted Tuesday at 08:49 AM Share Posted Tuesday at 08:49 AM The original poster seems rather exasperated due to issues with his vehicle. DPFs function well when all associated components operate properly. That is the problem! Link to comment Share on other sites More sharing options...
SushySosa Posted Tuesday at 08:49 AM Share Posted Tuesday at 08:49 AM ☺️ Link to comment Share on other sites More sharing options...
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