Whats the solution for the dreaded QLS sensor defect?

The only current fixes are to do a snip snip that shall not be named due to forum rules. Find a wrecked truck that has a working example on it at a junkyard. Buy used/refurbished from an iffy ebay seller. Or to start cold calling every single dealer in an expanding circle around your location that can work on an isx with your part number and asking if they have one. If you do the last one and they do buy it and have it overnighted to your current location.

 

Just to clarify, this is not just an International, every manufacture is having issues right now. Word is they are working on an emergency Calibration that will use a “virtual” QLS sensor and use your Nox inlet and outlet sensors to determine quality. Not sure of a timeline but at this point you’d think it’d be soon

 

And just to add, heard a rumour guys are having some luck putting the sensors in a bucket with ice and water for about 20 min. and then reinstalling. Who knows how long it lasts for though.

 

Mine went out a couple months ago. Truck sat for two weeks before our dealer could find one, and he made it sound like he had to pull a lot of strings to get it. I believe I may have gotten one of the last ones in the country lol.

 

Yes, either is gets too hot from the Def tank heater valve failing or to high of ambient temperatures heating up the def and wrecking it.

 

Try dealer again. Mine ordered from DC (Illinois) and had it next day.

 

Just buy a pair of vise grips and pinch off the coolant hoses to the tank if your QLS still has a pulse.