The check engine light on my 2012 f-350 diesel came on. I got the recall letter last month for the reductant heater and sender assembly. My question is it safe for me to drive until monday when I can get ahold of someone at the dealership

 

You can drive it.

 

Did you pull the codes to know what the CEL is about? It might be a problem that is different than what the letter is informing you.