C 13 kcb check engine light and coolant level indicator?

Hi.my Checkenginel ight going on and engine is shut down.(coolandlevel to low)after changing the hold harness and coolantsensor was ok for 1200 miles now is the same light go on and you see in the computer (Coolantlevel to low)what is wrong

 

Somebody can help sitting in irving.tx

 

Now were find the problem after months troublel witk checkengine light y engine shut down.diesel was in the colland now new o rings y cup for the inkectors hope monday me truck is ready

 

Now truck ready saturday, was a fast job in irving

 

Something wrong men

 

i like to see you writing this in german men i speak 3 languajes only my writting is bad better then nothing