I experienced this when I was a tech with Mercedes. Some customer left the oil fill cap off after adding oil which caused quite a mess in the engine bay. Once we put a new headlamp in and steamed cleaned the engine bay per customer request, the vehicle went into limp mode. Water got in between a connector and sensor (I forgot which one). Ran codes and disconnected the connector and dried it out and the sensor. We cleared the codes and the vehicle operated as designed.
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Ford Diesel and Heavy Line Technician at your service. 
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