Nox sensor removal

[kozakvod]

(05-13-2020 )Harman Wrote:  Hello,

I'm getting the code spn 1569 fmi 31 comes and goes.
Any advice what should i do to tackle this problem?

Do you have a QuickServe account? If not, go to https://quickserve.cummins.com WITH your engine serial number (8 digit number located on the driver side of engine) and register it. This is a free account and massively valuable as an owner of big red metal.

Not sure what you mean, "comes and goes?" Are you derated? According to Cummins you should be in an active torque derate currently, see below.

SPN 1569 FMI 31 - Engine Code: 3714 Engine Protection Torque Derate - Condition Exists

I am not the guy to ask here as my level of expertise is not there. I can tell you there are multiple possibilities according to Cummins for why you're getting this code, ALL after-treatment related from what I see.