Technical DPF or Sensor issue?

[deejays]

Sounds good. Do you have to have cables, or can you connect via a wireless OBDII Code reader View attachment 476090
like I can with google free car scanner app

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Either. But to access all modules you will need an cable adapter as per the attached from https://www.multiecuscan.net/SupportedVehiclesList.aspx
I use a Vgate vLinker MS Bluetooth which enable access to all modules without any extra interfacing cables. I suggest you have a look at https://www.multiecuscan.net/

 

[Killykix]

Hello, Quick update on my initial post (the conversation kinda drifted away ). We’ve replaced the DPF sensors with new ones (Bosch), and made our 3rd forced regeneration with a full tank of AD blue. All error codes went away, until we drove for 10min and warning light came back, without limb mode.
We’re running out of options. The only things left to do for us:
1. Disable entirely the AD Blue system
2. replace the AD blue sensors
3. Recalibrate the DPF sensor with disconnected pipes for the car to calculate 0 pressure in the open air
4. Remove entirely the DPF (what the garages here in Bulgaria want to do, but we don’t!)

If anybody has another idea, I’m more than open to hear about it, Thanks!

 

[jackwhoo]

Which warning light? What fault codes?

 

[deejays]

There is a history of the 2.3L AdBlue engine with regard to failing NOX sensors and soot sensors. A number had been replaced under warranty. One of the sensors in question is mounted under the bonnet near the top of the firewall - where the vacuum reservoir was mounted on the pre-AdBlue engine. The other sensor is very much downstream in the exhaust system and is mounted underneath towards the rear of the vehicle. If you have your vehicle at a FIAT PRO workshop then they should be able to diagnose the issue correctly for you and perhaps save you some money by not firing the parts canon.

 

[Killykix]

Which warning light? What fault codes?

Yellow engine light, not blinking associated with the message “Check engine”

Most recent error codes:

P1206-22; High flow resistance in Diesel Particulate Trap – Signal amplitude > maximum
P20EE-21; Urea NOx catalyst efficiency below threshold – Signal amplitude < minimum
P24A4-68; Soot Load too high and Mileage with Diesel Particulate Filter Lamp ON – Event info

 

[Killykix]

We read the new error codes at a garage, which gave us the following codes:

P220F-09 – NOx Sensor 2 performance
P06EB-92 – SCR efficiency below threshold

 

[jackwhoo]

Appears regen of dpf worked.

You have fault codes come back for nox reduction system = scr ,addblue , sensors

It could be faulty nox sensor or its wiring.
Or it could be something else to do with addblue system

Nox sensor 2 implies more than 1 nox sensor and code is for downstream sensor ie further away from engine than nox sensor 1. Together with the scr efficency code I wonder if nox sensor 2 monitors the scr performance.

Regardsless of the above nox does not cause soot and so wont block your dpf.

 

[Killykix]

Appears regen of dpf worked.

You have fault codes come back for nox reduction system = scr ,addblue , sensors

It could be faulty nox sensor or its wiring.
Or it could be something else to do with addblue system

Nox sensor 2 implies more than 1 nox sensor and code is for downstream sensor ie further away from engine than nox sensor 1. Together with the scr efficency code I wonder if nox sensor 2 monitors the scr performance.

Regardsless of the above nox does not cause soot and so wont block your dpf.

Indeed everything points to the NOx sensor 2, but a mechanic here told us that replacing it might not solve the problem. We don’t mind about the warning light on the dashboard if it’s just a faulty sensor, what we’re worried about is that limb mode will come back again. We’re considering disabling the entire SCR system as we don’t know what else to do

 

[deejays]

@Grayducato Can you perhaps advise considering what seems to be a similar issue you had some time back?

 

[jackwhoo]

Indeed everything points to the NOx sensor 2, but a mechanic here told us that replacing it might not solve the problem. We don’t mind about the warning light on the dashboard if it’s just a faulty sensor, what we’re worried about is that limb mode will come back again. We’re considering disabling the entire SCR system as we don’t know what else to do

I dont know if nox codes will cause limp mode. You could buy a cheap code reader to use yourself and if nox codes cause limp mode delete codes yourself.
Yes sensor may not be faulty , the code could be caused by add blue pump or block add blue injector or something else.
But if you want it fixed you have to start somewhere, i understand that there have been problems with nox sensor reliability.
If nox sensor not expensive I would suggest that as step forward.

If you are in a country with approved fiat proffessional mechanics it may be worth the extra expense of going to them.