Multiecuscan

[RGCH999]

As mentioned I have a problem with code
P2453-7A

DPF TRAP PRESSURE SENSOR

OIL LEAK OR RUBBER SEAL

This brings on dreaded amber light, but I can clear the code. if I then take it for a run the fault doesn’t reappear until I switch off and then on again. I am convinced this is a sensor fault but can someone throw some light on these readings.
DPF Pressure sensor registers 5 m bar. But once engine cools down it’s 0

DPF Status. Normal Clogging. BUT
PF Filter 85.39%. This reduces to 69.18% after a forced regeneration. If 100% is full I haven’t got much left. The vehicle has only done 24000 miles but is 7 years old.
last regen was done 229 miles ago so 300 between is probably the norm.

Average distance between regen. 750 miles.
Finally oil degradation is 87.843% last oil change approx 3500 miles ago !! Shows 3500 to next oil change.

Am I right in thinking % is not the correct measurement ??
Finally if I keep driving without warning light on should I be ok till it gets to workshop.
Any help advice appreciated.

THANKYOU

 

[RGCH999]

Anyone . Surely there’s some tech experts out there

 

[Spanner]

The dpf pressure sensor should read the same pressure hot or cold, you probably need a new pressure sensor

 

[Phill D]

a point i was given by a guy i trust is that forced regens more than a couple of times reduces the DPF performance and longevity.

a lot of the problems with DPF sensors is as a result of moisture from exhaust condensation. I know this as it troubled me a number of times.

 

[RGCH999]

Thanks both. I’m a bit concerned that after the forced regen, only dropped the filter to 69.18%. I have read somewhere that 100% is not necessarily full. I was under the impression that after regeneration, active or passive, that it would drop to maybe less than 20%. The base starting point seems very high.
, even though it says normal clogging.
Am I right in thinking the software only throws up the number of active regenerations, as I’ve only got 33 recorded over 24000 miles.

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[dunnah01]

Pretty sure on the 2.3 oil counts down so at 87% your oil is actually 13% degraded

I'd check the small bore vac pipes to the dpf differential pressure sensor for any leaks or damage first of all. If no obvious problem then I'd replace the sensor, and then do another forced regen to see what the new results are.

 

[RGCH999]

Pretty sure on the 2.3 oil counts down so at 87% your oil is actually 13% degraded

That would ease that worry. Thanks.
Cant understand why when I clear the error the van drove 150 miles with no problem. When I stopped and restarted 10 minutes later the amber management light stayed on. It’s as if when the engine is started when warm, the sensor throws a bad reading, I’m pretty sure it’s the sensor though.

 

[RGCH999]

Forgot to mention the DPF warning light hasn’t come on at all, so it seems to be working, but why doesn’t the % drop below 69%. Anyone have a reading for theirs. Possibly active and passive don’t burn it off completely??

 

[Steve and Denise]

Pretty sure on the 2.3 oil counts down so at 87% your oil is actually 13% degraded

I'd check the small bore vac pipes to the dpf differential pressure sensor for any leaks or damage first of all. If no obvious problem then I'd replace the sensor, and then do another forced regen to see what the new results are.

Get the lot removed from the ECU and sort the dpf, then hopefully you will have no more issues

 

[Derbyshire wanderer]

Pressure sensor appears faulty and will cause excess regeneration or no regeneration depending on what it is stuck at.
This will also explain the erratic soot readings.
Stupid plastic pos that costs an absolute fortune for what it is.

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[Raul]

On my vw crafter I found missing clips on the rubber lines going to the dpf diferential pressure sensor. On life data I could see pressure not increasing with revs. Clips on and pressure sensor changed, no more codes from there.

 

[RGCH999]

Question is can I use the vehicle till I replace the sensor. Motorway use so as long as I clear the error code before I start it should passively regenerate. Error only appears after I stop, in which case I just reset before returning.
Regen light hasn’t come on at all yet.

 

[Spanner]

Replace the sensor and avoid any unnecessary forced regenerations. It’s a simple job to fit a new dpf pressure sensor (there may be a superseded part number available for the original sensor) and avoid a cheap sensor.

 

[the1andonly]

As above avoid forced regens.
Which engine?
i think this may be usefull

DPF Differential Pressure sensor Diagnosis with MES

How to diagnose a problem the DPF Differential Pressure sensor and its impact on the DPF. known in mes parameter list as Differential Pressure Sensor. These sensors are prone to any debris or condensation in the exhaust, which can cause the...

www.fiatforum.com

as maybe this.

Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis.

This was originally written to help one person with his Ducato totally new to MES to start saving data. it is not an exhaustive manual nor intended to be. Tutorial to Measure specific Engine PIDs (Parameter ID) and Save data for analysis. Open...

www.fiatforum.com

 

[the1andonly]

An alternative way to test a sensor is to use a vaccum tester on one end of the sensor (remove both pipes) and read value in MES. a vacuum bleeder tool is suitable for this.

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[RGCH999]

Wow. Thanks for all that guys.
Final question.
If the sensor is faulty, will passive regeneration still continue if the conditions allow and the faults have been cleared and no warning lights illuminated. Could I do a two hour motorway journey, as the management light will only light when I stop.

 

[the1andonly]

The dpf % blocked goes upto 200%, dont expect realy low values.

Pretty sure on the 2.3 oil counts down so at 87% your oil is actually 13% degraded

Regeneration will not occur with a dead sensor. Forced regeneration can reduce life or destroy a dpf.