Midbed Ammonia Sensor

[uncleal13]

About 20 years ago I was at Los Angeles Freightliner for some minor factory warranty work (air conditioning leak), the service manager mentioned that they hate doing warranty work, as they only get paid half the regular shop rate.
Over the years this explains a lot of the on going issues people have had with their trucks. The dealers and their mechanics want that truck out of their shop as quickly as they can. While diagnosing a problem, as soon as they find anything wrong, they swap out a part and send you down the road. Even though something else upstream may be the actual cause of the issue.