Intermittent Red Triangle - not diagnosable ...

I will see if that has been done. That was done while my child had the car. I hope he remembers. He's not a paperwork guy.

 

The car drives very smoothly. Can I just add something to the fuel to clean the injectors? I always buy Top Tier gas.

I sure hope I don't have a head gasket issue. That's a big expense. I will keep checking the coolant. Are there any other indicators of a head gasket issue?

 

OK, so I called the mechanic that just looked at the car, and he said "Well, there were like 20 codes, but I cleared them out before I took it for a [useless,10 minute] test drive. I didn't write down any of the codes before I cleared it."

That's pretty annoying in my book, since he didn't even take it on the highway. I wish he had let me do it.

But here are the remaining codes right now:

Body control module
P0420
P0301 and P0304

Note that these codes have probably been on since the original catalytic converter was stolen. The mechanic who replaced the converter said he couldn't figure out how to get rid of them. I re the O2 sensors,

 

I certainly don't mean to dismiss the people here at the forum. I'm sorry you feel slighted. I'm also not sure why you think my approach is chaotic. The first person I took it to was a hybrid battery specialist. That's all he does. He doesn't work on anything else. I went there to have the battery checked out in case that was the problem. The second mechanic I had look at the vehicle replaced the plugs due to the engine misfire codes. He didn't think that the coils needed replacing, and thought the engine sounded fine after replacing the plugs. I did that before lending the vehicle to my child for an extended period of time. I didn't go back to him because the car was over 100 miles away! Her mechanic replaced the O2 sensor and also the coils (since the misfire was still showing), before I drove the car all the way back to Seattle. He tried to figure out what was wrong, but he couldn't. He suggested that I take the car to a Prius or Hybrid specialist, since that wasn't his area of expertise. I didn't put all extraneous information in my description, since I didn't think it was particularly relevant.

As for the brake actuator, yes, I don't doubt that it needs replacing, but I literally do not have that kind of money right now. I am trying to pay off a substantial loan that I took out for a medical procedure. Until that's paid off or mostly paid off, I can't borrow any more money. I am trying to fix what is most critical first. And as for the oil, it was also changed before I lent her the car, and we have both checked it regularly. It's clean and full. And yes, I also understand that they are "new" codes. When I said remaining, I mean that they still show up.