Check engine and low coolant light intermittent

[SAexp]

Unfortunately I did not do the pressure tests. Today I took a load and the truck is bogging down quickly and lights still flashing. More so now than before. I don’t have a boost gauge to know if the turbo is actually working correctly. However it is making a strange noise now. Sounds like someone threw sand in it. At this point I’m sure that’s the problem. I plan to run empty back home and get it put into the shop.
The sensor for the boost pressure that I had replaced less than 30,000 miles ago I can no longer get lose.