Last Dance at 1.2 Million Miles - 3216

[JKBowman]

Thanks, Flatbed.

I've asked myself that many times. :blush:

All I can say is team truck, almost all light loads, minimal idling. Never pushed the RPMs hard while accelerating. Took it easy climbing hills, always. Never kept running her when something needed to be fixed. Delvac only until 800,000 then I began adding some Lucas. Leaned heavily on a small network of personally chosen shops. And for whatever it's worth, had a standing rule to never use "MHC" - no matter what.

In other words, my wife and I just babied her and it shows. I'll post a pic later today. Seriously, to us she looks like a 250,000 mile truck or even better.

(08-08-2019 )Rawze Wrote:  SPN:3216,FMI:20 = cummins fault code 3748. -> ftertreatment Intake NOx Sensor - Data Not Rational - Drifted High. An offset in the intake nitrogen oxide (NOx) sensor reading has been detected.


I.E.> A bad, leaking, or improperly installed NOx sensor at the back of the turbo... OR someone has replaced it with a fake sensor, or Chinese after-market one. It is basicly complaining that the sensor is not reading ZERO with engine off, during self test ... OR it is not changing at all when engine is revving up and down and under loads.

It will not clear this fault until you get the engine and exhaust 350+-F degrees, drive around a bit under varying conditions, and the self tests that were failing pass their checks again.

Thanks again, Rawze. Sounds like you think there's a chance she might clear the code herself if she gets hot enough. There's very little chance I have a fake or Chinese sensor.

Since I don't have Insite I guess I'll try the drive-around approach. Wish me luck.

Onward!