Intake manifold removal and deep cleaning. Complete EGR Systems including egr cooler removal and deep clean Catch Can Head gasket Both water Pumps New Brake Actuator System New Traction Battery Inverter Firmware updates from dealer Load Test 12 Battery Closely Monitor Engine Coolant Level. It should not change. If it does most likely head gasket..... Check engine oil bi weekly or everyday until you know the consumption rate
The other suggestions are good, but don't scare the poor guy; lets just say the ones I've flagged are items that he should be cognizant of? With the miles though, that head gasket could well be a goner...
What bugs me about Priuschat is why does a guy post on Monday and no one sees it until Friday? I never saw it at all until Tim replied. If this forum was more timely we might have given this guy an option to punt.