Having some issues. Getting codes p0117, p0300-302. Help?

So 2010 prius w/127xxx miles. Yesterday the check engine light came on, i scanned it and got p0117. I read into it and checked my coolant, it was at a fine level. So i drove the rest of the way home, maybe 11 miles.

As i was about to my driveway, the temp light started flashing, and then went off. I checked my coolant and it was now very very low. Added pink toyota coolant last night and let it sit.

This morning the coolant was still full. I turned it onto maintenance mode to let the coolant move and almost immediately the check engine light came back on. Checked; now in addition to p0117, i have p0300, 0301 & 0302. The engine was running fine though, i turned on the heat, no issues. I turned on the ac, and a minute or two later, the engine idled roughly, for maybe 30ish seconds before sounding normal again.

At this pt, i turn off maintenance mode and turn the car on. I clear the engine codes and take it for a quick drive. Runs smoothly, says im averaging 46.2 mpg still. I take it on the freeway for 2 exits to test at high speeds and it still runs smooth.

Then as i am driving home, the car feels rough again, and the temp light begins flashing. I pull into a parking lot and check the coolant. Under the hood, the areas around the coolant reservoir are hot to the touch, the coolant is not full anymore but not low either. The car no longer feels as rough as it just did and the temp light is off again.

So I continue the last mile of my drive home, the temp light flashes again about 0.5 miles down the rd, so i pull over again and check the coolant. Now the coolant is lower than it was just half a mile back, i check the obd app and it says the engine temp is in the red, so i turn the car off and let it sit for 10-15 minutes. The temp goes back down, no temp light and i drive the final 1/2 mile home, pull into the driveway and the light comes on again. I turn the car off and check coolant reservoir, this time though its now full, as full as it was when i put coolant in it last night. I watch the tank and it is now filling itself back up with coolant and the black pipe connecting to the coolant reservoir is shaking slightly. So the coolant tank bubbled and literally filled itself back up.

I am taking it to the ONLY independent prius repair shop in the area (that i am aware of) but they told me they cannot begin to diagnose it until the 11th and to just keep driving it for now. I dont like that answer, so i wanted to see if anyone had some opinions or experience. I started considering replacing the MAF, the coils and spark plugs and the ECT sensor, as well as trying to clean out any of the areas that ive read could be gunked up. But the more i read, the worse it sounds and it seems like maybe i shouldnt do the above because it may be a waste if it is an issue w….the big thing. Thanks everyone

 

I dont think it has. I spent last night watching Nutz n Boltz videos about removing and cleaning the egr, egr pipe & intake manifold. Im not the most mechanical when it comes to cars, but i am handy and have worked on things on my old prius like replacing coils, MAF sensors and some other engine parts; so i think with patience and lots of video help, i can do these cleanings and replace the spark plugs and ECT sensor this weekend. Ill post an update when it’s completed. The person below mentioned the water pump though idk if it is worth it to do all of this at once or one at a time to attempt to diagnose. But do you have any opinions on if this is all wasteful?

 

Thank you!

thank you Bisco! Fingers crossed

 

Hmmmm…..now im wondering if i should replace a bunch of things (spark plugs, coils, MAF & ECT sensors, thermostat, and maybe the water pump as well as cleaning the egr and intake manifold. It seems like a lot of work and idk if it is worth it to do it all at once, or one at a time to diagnose.