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Message: <blockquote data-quote="ORVietVet" data-source="post: 28539" data-attributes="member: 9438">Ok, so yesterday I worked on a 2018 Toyota Camry XLE 2.5 Hybrid and dealt with a code P0128, to do with cooling system running to cold. Research points at the thermostat. Fans not involved because of the cooling running temps. I gotta tell ya, that thermostat/housing assembly, is a big PITA to get to.Removed upper radiator cover, air snorkel, disconnected 8 different sensor connectors, including one on the thermostat housing. Then fold out of the way for access from above but that just means reach down and then curl the hands and fingers up to remove 2 8mm bolts and then the housing comes off. Reverse the procedure and then the fun begins.Have to highest line on the cooling system and that is the EGR connector hose. Lay a cloth under it to catch coolant as it comes out during filling of coolant, after replacing the radiator drain plug. The refill is very slow going and filling the reservoir, too. You also have to burp the upper and lower radiator hoses. Fill very slow. The process takes about 30-40 minutes and then the coolant runs out at the disconnected EGR tube. Reconnect EGR line at the tube.Then you start the engine and have to go thru 3-4 cycles to heat up engine and get it to open the thermostat and then top it all off again. Cleared code. Roadtested and monitored Live Data to watch the ECT sensor temps. All good and fans cycle as should. Codes all gone. See pics.[ATTACH=full]5895[/ATTACH][ATTACH=full]5896[/ATTACH][ATTACH=full]5897[/ATTACH][ATTACH=full]5898[/ATTACH][ATTACH=full]5899[/ATTACH][ATTACH=full]5900[/ATTACH][ATTACH=full]5901[/ATTACH][ATTACH=full]5902[/ATTACH]</blockquote>