Error code, P2454 DPF Differential Pressure Sensor Circuit Low

[Dean Fletcher]

Hi and thank you. First time I checked it was 0.005 bar at idle like you say, varying a little when under revs. Second time about -0.007 bar at idle, going up to about 0.022 when driving and revving. For now engine light is off

That seems OK to me. Do you have any other codes. Sometimes a faulty catalyst temp sensor can throw a dpf Ps code?

 

[Exp21]

No other codes. I'll have to wait till next time the issue comes back I suppose

 

[Exp21]

Today I noticed that even with engine light off, engine was without power and didn't go past 2500 rpms. B28/8 sensor (dpf differential pressure) live data were fine. Then I cleared stored codes and car came back to run fine with full power. The 7g+ also did jerks and converter slipped a lot. The strange thing is that even with light off, car was not ok.

Now I really don't know what to do. The only value the Autel scan signs in red is the B60 counterpressure at exhaust sensor. It's around 1.1-1.2 bar at idle, increasing under revs. If anyone knows what to do would be much appreciated

 

[Exp21]

After clearing codes, now diagnosis shows P246309 "The soot content of the diesel particulate filter is not regular", no CEL.
Live data of the B28/8 (differential pressure sensor) seems fine. Dpf ash content is 0.5g.
Any suggestion is much appreciated, thank you

 

[Dean Fletcher]

After clearing codes, now diagnosis shows P246309 "The soot content of the diesel particulate filter is not regular", no CEL.
Live data of the B28/8 (differential pressure sensor) seems fine. Dpf ash content is 0.5g.
Any suggestion is much appreciated, thank you

I'm the liva data field is your pressure sensor sitting around -0.004 bar and 0.004 bar on idle? And does it change when applying throttle

 

[Exp21]

Hi, I remember xentry said it must be between -0.04 and +0.04 bar with ignition on (engine off), and with engine on between -0.02 bar and 1.12 bar. I'm within specs, the only thing I notice is that even with full throttle when the B60 counterpressure sensor goes up to about 2.8 bar, the B28/8 stays near zero, varying very little. Is it normal? By the way, do you have xentry reference values also for the B60 sensor? Thank you very much