DPF Differential Pressure Readings

[dogday]

Hi,

RE: W212 E220 CDI

What should the readings for the DPF Differential Pressure Sensor (icarsoft in bars) be?

Also, what should the readings for Fill Level, Soot Content and Ash Content be or are these variable based on how recent the DPF has been auto regenerated?

Thanks

 

[Seanalf]

Following as I am having similar questions which has lead to a new DPF sensor arriving today to be fitted

 

[dogday]

Following as I am having similar questions which has lead to a new DPF sensor arriving today to be fitted

Hi Seanalf,

Not sure if your car will have the same fitting instructions but this is an excellent video for replacing the sensor for the W212.

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[Seanalf]

Hi Seanalf,

Not sure if your car will have the same fitting instructions but this is an excellent video for replacing the sensor for the W212.

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Thanks for this, I have found a good vid on youtube, my question (which I put in a separate thread) was if I change it and it is the issue, would I still need to clear the fault etc or while the ECU detect the correct reading and reset?

 

[DSM10000]

Hi,

RE: W212 E220 CDI

What should the readings for the DPF Differential Pressure Sensor (icarsoft in bars) be?

Also, what should the readings for Fill Level, Soot Content and Ash Content be or are these variable based on how recent the DPF has been auto regenerated?

Thanks

Do you mean Diesel Particulate Filter?

 

[dogday]

Thanks for this, I have found a good vid on youtube, my question (which I put in a separate thread) was if I change it and it is the issue, would I still need to clear the fault etc or while the ECU detect the correct reading and reset?

The original fault on mine was the engine management light on and icarsoft saying "The input for differential pressure sensor 1 in the dpf has a malfunction. There is an invalid signal". The pressure readings were 0.01 bar whilst idling and to a max of 0.08 bar when revving. I replaced the sensor a few days ago and the EML stayed on for a few miles and then went out. I have now driven 300 miles and the EML is still off. When I repeated the scan the error codes were still there but I honestly cannot remember if I deleted them before. When the Mrs gives me the car back later I will run the scan again. Assuming that the new sensor does work it does appear likely that the fault codes will have to be cleared after fitting the replacement sensor. I'm assuming the replacement has worked as the EML has not come back on. With the new sensor the pressure readings are now 0.0 bar at idle and over 0.1 bar when revving, hence my original question to check these numbers.

 

[dogday]

Do you mean Diesel Particulate Filter?

Yes

 

[DSM10000]

Yes

That would make sense then

 

[dogday]

That would make sense then

What else could DPF stand for ?

 

[DSM10000]

 

[Seanalf]

The original fault on mine was the engine management light on and icarsoft saying "The input for differential pressure sensor 1 in the dpf has a malfunction. There is an invalid signal". The pressure readings were 0.01 bar whilst idling and to a max of 0.08 bar when revving. I replaced the sensor a few days ago and the EML stayed on for a few miles and then went out. I have now driven 300 miles and the EML is still off. When I repeated the scan the error codes were still there but I honestly cannot remember if I deleted them before. When the Mrs gives me the car back later I will run the scan again. Assuming that the new sensor does work it does appear likely that the fault codes will have to be cleared after fitting the replacement sensor. I'm assuming the replacement has worked as the EML has not come back on. With the new sensor the pressure readings are now 0.0 bar at idle and over 0.1 bar when revving, hence my original question to check these numbers.

I've fitted the new sensor, light is still on. Reason we went for the sensor, was getting a fail on diagnostic, the car was saying "soot levels too high". Car was reporting 186%.
Tried a forced regen which could only be done whilst moving (fun), got the soot levels dropping down to 120% and the diagnostic system failed. Every time we went back in, it did the same, showed 186%, then failed. We figured the sensor must be reporting the wrong amount, the diagnostic failing was odd, but may have been because it was a day or four out of subscription!

Anyway, light out and 4 attempted regeneration, took the car home, did 200 plus miles before the light came back on Saturday afternoon. I suppose the only thing I can do is get it reset and see what happens next. Disconnected the battery for 10mins, but that didn't clear it.

 

[Amg 007]

Would a faulty dpf sensor cause low boost issues at all ?

 

[OneForTheRoad]

Would a faulty dpf sensor cause low boost issues at all ?

Yes , engine goes limp.

Icarsoft limits for dpf sensor are plus or minus 0.03 . Zero being ideal.

Soot levels can show as 400% and people assume the dpf is knackered.

The 2 pipes going to the sensor are also best removed and blown in to check for any blockage.

 

[OneForTheRoad]

The original fault on mine was the engine management light on and icarsoft saying "The input for differential pressure sensor 1 in the dpf has a malfunction. There is an invalid signal". The pressure readings were 0.01 bar whilst idling and to a max of 0.08 bar when revving. I replaced the sensor a few days ago and the EML stayed on for a few miles and then went out. I have now driven 300 miles and the EML is still off. When I repeated the scan the error codes were still there but I honestly cannot remember if I deleted them before. When the Mrs gives me the car back later I will run the scan again. Assuming that the new sensor does work it does appear likely that the fault codes will have to be cleared after fitting the replacement sensor. I'm assuming the replacement has worked as the EML has not come back on. With the new sensor the pressure readings are now 0.0 bar at idle and over 0.1 bar when revving, hence my original question to check these numbers.

Using icarsoft after replacing sensor ,you go into dpf regen section and the unit runs a series of adaptations. The pressure sensor will be part of this and the new values will be stored by the ECU . If this step isn't done the ECU will still think the old sensor is fitted , making it sometimes impossible to delete error codes.

 

[dogday]

I've fitted the new sensor, light is still on. Reason we went for the sensor, was getting a fail on diagnostic, the car was saying "soot levels too high". Car was reporting 186%.
Tried a forced regen which could only be done whilst moving (fun), got the soot levels dropping down to 120% and the diagnostic system failed. Every time we went back in, it did the same, showed 186%, then failed. We figured the sensor must be reporting the wrong amount, the diagnostic failing was odd, but may have been because it was a day or four out of subscription!

Anyway, light out and 4 attempted regeneration, took the car home, did 200 plus miles before the light came back on Saturday afternoon. I suppose the only thing I can do is get it reset and see what happens next. Disconnected the battery for 10mins, but that didn't clear it.

As OneForTheRoad said, the two rubber pipes to the sensor can develop hidden splits which can only be detected by bending the pipe and exposing the split. This, I believe, can cause similar fault codes to the faulty sensor?

 

[dogday]

Using icarsoft after replacing sensor ,you go into dpf regen section and the unit runs a series of adaptations. The pressure sensor will be part of this and the new values will be stored by the ECU . If this step isn't done the ECU will still think the old sensor is fitted , making it sometimes impossible to delete error codes.

As previously mentioned, the fault codes still remained after fitting the new sensor. I did not go into the dpf regen section. I deleted the fault codes yesterday and after driving 50 miles the fault codes or the EML have not returned. Here's the latest readings, which assume to be the correct working figures;

DPF Differential Pressure Sensor (at idle) = 0.01 bar
DPF Differential Pressure Sensor (at 3000rpm) = 0.10 bar
Fill level of DPF = 78%
Soot content of DPF = 5g
Ash Content of DPF = 1g
Total distance at last correction of ash content = 61694Km

DSM10000- Afraid I deleted the first post before writing this post so unsure what I wrote in that post?

 

[Jor1alderson]

Hi, looking for some help. Is this the position of the DPF sensor? Its on a 2019 cla. DPF needs a clean due to only short journeys and dont want to remove the wrong pipes. Thanks in advance

 

[dogday]

Hi. My wife has our car at the mo so I can't check but it looks about right. Here's the dpf sensor, after the bracket holding the sensor has been removed, with the two pipes going to it. One thing I would say is be very careful prying the pipes from the sensor because the plastic tubes on the sensor are thin and snap off easily..... as I found out !