Peugeot 3008 1.5 hdi 2019

[Pepe autotechnics]

Hi I have a Peugeot 3008 1.5 hdi 2019 with adblue fault last week I replaced the urea injector as it was open circuit and leaking adblue, that fault I was then able to clear and now this week I have a different fault with adblue system fault code P20EE 92 and depollution of the deNox system effectiveness fault the system pressuring ok 5 bar and injector working ok and system test said ok on diagbox, but with engine running in parameters shows flow of exhaust gas estimated by the Nox sensor is -87241523200 which seems very high in minus figures, do you think the fault is the DeNox sensor??

[mickthemaverick]

That sounds like a sensor error. Did you use the repair section of Diagbox to confirm new parts fitted?

[Pepe autotechnics]

Yes used repair section and new part but I replaced the urea injector as it was leaking and now I think the fault is the DeNox sensor as the urea injector works!! And in the parameter readings I sent shows very weird DeNox sensor readings!!

[Pepe autotechnics]

Do you think this is a DeNox sensor fault, as per parameter readings?

[mickthemaverick]

Yes, that is what I meant in my 'sounds like a sensor' comment yesterday.

[Pepe autotechnics]

Hi the repair for this fault was software update as per technical service bulletin (TSB) from Stellantis, all ok now after inj ecu update.

[perfidus]

Hi @Pepe,
I also had this P20EE 92 error after a NOx sensor replacement. I think it was because the NOx sensor was not "learned" properly with the respective procedure in Diagbox (some other Adblue related error was in effect). Atfer another 150Km or so, after this error was issued, the NOx sensor learning procedure was repeated successfully and since then I have no more NOx related errors (~2500Km in summer conditions). There is a steady AdBlue consumption of 1,2-1,4 L / 1000Km.
I need to ask you what is the TSB number from Stellantis related to this error, in case that the error might pop-up again in the future.
PS. I have now original ECU software from 2016 (restored to default - but not at the dealer shop - it's a long story and you cand find it in my posts).