Low Def quality

[Tinker65]

Hi new to site what can be done we have T770 it's bringing up codes for low Def quality. I've used this Def fluid brand for some time no issues on this machine and our trucks what has to be done . Machine will not run over 1200 RPM.

 

[foton]

look at the date code believe it or not that stuff has a shelf life. Glad I have nothing new enough that needs it. I think I have heard of crystals forming on the sensor making it give bad readings too,

 

[SkidTracks]

For around $20 you can buy a DEF checking scope which will tell you if is correct ratio (32.5% urea) to de-mineralized water.

I have read where scrupulously people were buying jugs of DEF, using DEF, refilling jugs with tap water, and returning jugs as unused.