well E26 is an oxygen heater sensor fault, until you replace the O2 sensor this will not clear.
After replacing this component you will need to run a Fast TAS learn using the laptop program or a GSE handset. This will recalibrate the air/fuel mixture ratio's in the ECM memory.

as for the E32 this is a step 1 overheat code for the cooling system which should clear during the reset but will return if the condition is still present after running the truck for a bit. If it still codes out and you know for a fact the engine is not running hot then look at the temp sensor and its associated wiring for problems.