Prius Gen 1 Issue (2003)

Congrats on the success.

Now, while it's working is a good time to document what you learned. Unless you are going into the Prius repair business you may not ever need to do the same repair again. My Gen 1 worked properly for about 15 years and about 150,000 miles, then finally needed to have HV battery modules replaced.

 

I have also experienced the warning light with no codes. Take in mind that this warning light will also come on when it senses low oil, Low coolants and low brake fluid, and it will come on to "pending" trouble codes that many code readers don't read till the reading comes around as "temporary" or "permanent".

When the triangle warning light comes on with the car symbol, it is important to pay attention to it. Stop and check all the safety and maintenance basics, oil, coolants, brake fluids, etc.. then it is OK to continue to a mechanic or to home, but that light always means that something needs service.

My light comes on very rarely, but when it does, and I use a pro code reader, I find a pending code for my fuel tank vapor emissions which I haven't yet tracked down the actual cause. It effects one of the five readiness monitors for inspection, but in my state we pass inspection with no less than four monitors passing. I still intend to fix this when winter and mud season are over so I can work more deeply on the diagnosis.

 

P.S.: The triangle light is not the "Triangle of Death", it is simply an important warning light. Don't Freak!

 

I won't mislead you and say that it is simple, but really it is not difficult to do, as long as to follow safety processes and procedures to avoid getting shocked or electrocuted, and get some instructions on access and removal and follow them.