2014 Audi A6 CPNB - 15474 - Particulate Matter Sensor - P24AE

[Uwe]

since it appears to only be a thing on NAR vehicles..... does anyone know if this might be possible?

I think it's unlikely. Our ECUs have NAR-specific software in them and generally won't accept coding that changes anything regarding emissions-related items.

-Uwe-

 

[SaVAGeSoot]

Seems legit.... way to crush my dreams!
Based on what I'm seeing in these DTC tables, I'll have to get under this thing to check the electrical connector first.... it's not a cheap sensor, and with our Loonie going to crap daily, I can't even do the usual think and order from you yanks to lower my costs!

 

[Uwe]

with our Loonie going to crap daily,

Gosh, I would have expected something of a bounce after yesterday's announcement.

-Uwe-

 

[SaVAGeSoot]

 

[Uwe]

Yeah, I'd definitely check the all the connections before loading the parts canon.

-Uwe-

 

[Dr Sheldon]

Yesterday's back-and-forth with @Dr Sheldon regarding this sensor being a thing or not, has caused me to dream up the potential option of perhaps "long coding" the PM sensor out of the controller, since it appears to only be a thing on NAR vehicles..... does anyone know if this might be possible?

Would that be as easy a coding ?

I think that would be similar to EGR, Swirl, Adblue, DPF delete - Can be done. But by re mapping I would have thought !

 

[SaVAGeSoot]

Would that be as easy a coding ?

I think that would be similar to EGR, Swirl, Adblue, DPF delete - Can be done. But by re mapping I would have thought !

Kick a guy while he's down why don't you.... like I said, we all have dreams

 

[Dr Sheldon]

Yeah, I'd definitely check the all the connections before loading the parts canon.

-Uwe-

No need

If it is anything like a Nox sensor with its own module - Which this has then it will only have +, -, Can h & Can lo. Anything wrong with power or wiring and it will throw a No Comm fault.

 

[SaVAGeSoot]

No need

If it is anything like a Nox sensor with its own module - Which this has then it will only have +, -, Can h & Can lo. Anything wrong with power or wiring and it will throw a No Comm fault.

I don't want to admit it, but based on post #3 and the FF data, I think she's got internal issues!

                    Com i PP Ds IDE Raw: 0.000 µA
                    Exh i PP Ds IDE Shnt Circ: 0.0 µA

 

[Dr Sheldon]

Kick a guy while he's down why don't you.... like I said, we all have dreams

Wonder if you could get an ECU from an English car - Immo Off it and bolt it in ? They are £50 - £60 on ebay !

If they dont deliver to Canada, i'd be happy to send it to you.

 

[SaVAGeSoot]

Thanks for the offer, but I won't hack the vehicle like that just to save a few hundos..... thus far, it's just annoying me, so I can probably just rock the MIL for a while as long as the overall functionality of the systems doesn't crap out, while I look for a reasonably priced source for the sensor.... I'll keep you all posted in the name of education..... errrrr... entertainment.
Here's another link for educational purposes.

Particulate matter sensor

The particulate matter sensor is used to monitor the function of the diesel particle filter (DPF).

www.bosch-mobility.com

And 3 different faults with various FF data that I'm mulling over trying to come up with theories on.

15474 - Particulate Matter Sensor 
          P24AE 00 [10101111] - Electrical Malfunction
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 141987 km
                    Date: 2025.01.05
                    Time: 13:53:37

                    Engine RPM: 749.00 /min
                    Normed load value: 38.4 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 68 °C
                    Intake air temperature: -4 °C
                    Ambient air pressure: 970 mbar
                    Voltage terminal 30: 14.480 V
                    Unlearning counter according OBD: 40
                    Exh u PP Ds Batt Snsr Raw: 14.4 V
                    Com i PP Ds IDE Raw: 0.000 µA
                    Exh i PP Ds IDE Shnt Circ: 0.0 µA
                    Exh st PP Ds St Ma-Bits 0-7: 2
                    Particle sensor: surface temperature: 606.85 °C
                    Particle sensor: heat voltage: 0.00 V

15474 - Particulate Matter Sensor 
          P24AE 00 [11101101] - Electrical Malfunction
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 141917 km
                    Date: 2024.12.31
                    Time: 12:03:07

                    Engine RPM: 888.50 /min
                    Normed load value: 50.6 %
                    Vehicle speed: 1 km/h
                    Coolant temperature: 68 °C
                    Intake air temperature: 8 °C
                    Ambient air pressure: 960 mbar
                    Voltage terminal 30: 14.500 V
                    Unlearning counter according OBD: 40
                    Exh u PP Ds Batt Snsr Raw: 14.5 V
                    Com i PP Ds IDE Raw: 0.000 µA
                    Exh i PP Ds IDE Shnt Circ: 0.0 µA
                    Exh st PP Ds St Ma-Bits 0-7: 2
                    Particle sensor: surface temperature: 599.85 °C
                    Particle sensor: heat voltage: 0.00 V

15474 - Particulate Matter Sensor 
          P24AE 00 [01100000] - Electrical Malfunction
          Intermittent - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 140292 km
                    Date: 2024.10.04
                    Time: 06:27:19

                    Engine RPM: 3492.50 /min
                    Normed load value: 99.6 %
                    Vehicle speed: 131 km/h
                    Coolant temperature: 79 °C
                    Intake air temperature: 27 °C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 14.400 V
                    Unlearning counter according OBD: 3
                    Exh u PP Ds Batt Snsr Raw: 14.3 V
                    Com i PP Ds IDE Raw: 0.000 µA
                    Exh i PP Ds IDE Shnt Circ: 0.0 µA
                    Exh st PP Ds St Ma-Bits 0-7: 2
                    Particle sensor: surface temperature: 633.85 °C
                    Particle sensor: heat voltage: 0.00 V

 

[SaVAGeSoot]

Once again, I'm learning way more than I care to know about this sensor due to these faults.....
Based on this, I'm starting to lean towards the internal heater failing as the sensor appears to just be flirting with the 600ºC mark, which it needs to get well past in order to "self clean".
If you're bored, have a read

Characteristics of Resistive PM Sensors for Onboard Diagnostics of Diesel Particulate Filter Failure

In accordance with the recently reinforced exhaust regulations and onboard diagnostics regulations, it is essential to adopt diesel particulate filter systems in diesel vehicles; a sensor that directly measures particulate matter (PM) in exhaust gas is installed to precisely monitor diesel...

www.mdpi.com

I will do a log on the sensor surface temp next time I get a chance to see if I can confirm these wild theories of mine.

 

[Dr Sheldon]

P24AE 00 [10101111] - Electrical Malfunction

Does that not suggest that it is happy with the heater circuit ?

Com i PP Ds IDE Raw: 0.000 µA Exh i PP Ds IDE Shnt Circ: 0.0 µA

It is looking at MicroAmps there !

 

[SaVAGeSoot]

Does that not suggest that it is happy with the heater circuit ?

Not to me! What are you seeing that I'm not?
To me, that says:
- MIL on
- Test failed since last cleared
- Confirmed DTC
- Pending DTC
- Test failed this operation period
- Active fault

It is looking at MicroAmps there !

I agree captain obvious..... but is there a point you're making? (again)

 

[rntrary]

Any updates on this issue please?
I have the same 15474 - Particulate Matter Sensor. 2015 Q5 CPNB
Was intermittent but now stuck on.
Is it the first exhaust sensor after the cat?

 

[SaVAGeSoot]

Any updates on this issue please?
I have the same 15474 - Particulate Matter Sensor. 2015 Q5 CPNB
Was intermittent but now stuck on.
Is it the first exhaust sensor after the cat?

Apparently I missed this reply.... no updates, other than I'm driving with a MIL on.
Life hasn't allowed me the flexibility to try to diagnose further yet.
As far as location, it should be the 2nd last sensor in the exhaust system.