Checkout this video to get more info. on how you could get your truck back on the road if it is having a DEF quality sensor issue! Jamie did some investigating of the issue and found that the sensor itself is the issue and is what needs to be replaced. HM Repairs has stock of the sensor needed to replace a variety of makes/models of heavy duty trucks and equipment. We have found that the sensor used is quite universal! Give us a call to purchase a sensor or have yours sent to us for replacement!