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Someone has told me that DEF degrades with both heat and time. If the DEF was the original fill, ran through the whole summer, and was 6 months (or more, depending on when the car was built) old, could it be that the combination of time and heat did actually cause the DEF that was good in July to be of low quality by December?
It does have a shelf life supposedly.
The DEF quality poor indication can of course be an indication of poor DEF quality but I would bet that it is not the case in your circumstance. I can't argue with your results though. I am just sharing my experiences with this issue. That's what these forums are for. People post, you decide. The dealers are not up to speed on this and they will just "carpet bomb" the issue with parts until it goes away. I want to know why. I hope your problem is solved. Please post it it ever comes back.
Yeah, I'll definitely be posting up if I have any further issues. I'd definitely be curious to see what really happened, but how would you know for sure at this point? I really hate taking my stuff to the dealer unless I absolutely have to. Hve you noticed the NOx sensors seem to be prone to electrical problems as well as the buildup of deposits? I had some problems with my dmax truck going into limp mode due to corrosion in the wire connector for the rear NOx sensor. It didn't set a DEF poor warning, the truck just went directly into limp mode and wouldn't go over 55 mph. My buddies Dodge did the exact same and took several trips to the dealer before they finally just replaced the sensor which fixed it.
True. We cant fix it if it ain't broke. I think we have to wait and see how it goes. If I get it again I plan to do some experiments with the sensors.
Does anyone remember how much DEF was in your tank when you left the dealership? I have a new car and it shows 36% which I thought was weird.
Diesel Exhaust Fluid (DEF) Production
Diesel Exhaust Fluid (DEF) is made from a high purity urea solution. Urea is produced synthetically from ammonia and carbon dioxide (CO2). Urea is found in every day US products such as hair conditioner, cosmetics, adhesives.
Here's what natural urea is:
a colorless crystalline compound that is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine.
Refilling the DEF fluid is part of the free 24 month maintenance provided by the dealership...are some of you not taking advantage of that?
Don't know if this helps the debate or not???
Thanks for the post, I find it intriguing that my initial observation wasn't unique.