Poor Def Quality SPN 3364 FMI 2 DD15 Cascadia EVO 2014

I have the same problem going on for 7 months, change one box, def metering unit, new def filter , def header, nox inlet and outlet sensor, every single sensor that has something to do with the def and I still have the same problem def qualitycode ... please help if you have any info? All repairs done in premiertruck group Freightliner dealership ..

 

As I said in your other thread: Verify the DEF you're using is of adequate quality.

 

This code has been a problem in my 2016, it's definitely a crystaliztion of def, they go and fish it out with a kit and it's usually a warranty thing, I hate Def systems

 

If you're getting codes 4364 18, 4364 01 - NOx conversion Low, NOx conversion very Low and 3364 02 - DEF quality replace both your inlet and outlet NOx sensors. There's nothing wrong with your DEF. Hundreds of thousands of trucks buy DEF from the pumps daily. If the DEF was bad at the pumps there would be thousands of trucks at repair shops daily for bad DEF.

Would also be wise to clean your DEF metering unit, it can crystalize. There's 2 small filter screens and an orifice. Just clean with hot water. There's a few videos on you tube how to...

 

good advice

 

Hi I'm having the similar issue, took it to freightliner dallas premier also and they installed and awning kit. Drove about 100 miles and then it called for a forced region and code EEC 61 FAIL 20 SPN 3226. Any ideas?