Have a 2015 XLT EL with 79K. This AM at startup I got check engine light and upon reading have codes of P051B and P051D - indicating a crankcase pressure sensor. Truck was running fine night before. Did change oil over weekend and put 5W20 in instead of 5W30 (carryover in memory from 5.4L). Used Napa synthetic with platinum filter. For crankcase pressure sensor could not find part at Autozone or at NAPA. Called local Ford dealer and told part is out of stock until end of January, cost of $57, and dealer had several vehicles awaiting part in lot. Decided to use code reader to clear code and see if it comes back since I can not get replacement for several weeks. Anybody else received this code and what was solution, or is it related to the slightly thinner oil?