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How many miles on the car? 99% sure it is a bad head gasket!
Very doubtful. When the car is running (in ready), the 12v system in the car is powered by the DC/DC converter, which is located inside the...
How old is the 12v battery?
Take a look at this recent thread about coolant loss: https://priuschat.com/index.php?posts/3496635
What water pump and thermostat did you buy? OEM or aftermarket? I hope you got OEM. If not, you may be replacing it again in about one year.
That is a very good question. When the engine water pump goes bad on this engine (not enough coolant flow through the engine), the engine...
Did the mechanic give you the codes? If so, list all of them so that we can give our opinion on what needs to be done to fix the problem. You can...
First check the engine coolant level in the plastic reservoir on the passengers side. The level should be near the seam in the tank. You should...
Each dealership is different. Why not call your local dealer and find out for yourself?
Yes, you should be very concerned about the diagnoses of a HV battery replacement. The dealer apparently did not go through the troubleshooting...
I agree with you 100% with your statement. When the head gasket fails on these engines, the loss of coolant goes into the cylinder and cause...
I believe that the hybrid battery needs to be at 70F or warmer for the test to complete successfully. Try doing the Life Expectancy Test. You do...
Ask for the old water pump to be returning to you. Try to rotate the impeller. How easily or hard is it to spin? Try to pull the impeller off the...
I disagree with you. The most probable fix to this problem is to replace the engine water pump. Let's see what happens after the OP replaces...
Trouble code P0420 description is "Catalyst System Efficiency Below Threshold (Bank 1). It does NOT mean that sensor 1 or sensor 2 are good or...
Look in your owners manual to find out what the red light is.
Personally, I use NGK or Denso in my Prius.
The black rubber cap is on the overflow tube of your reservoir. If too much pressure is built up in the cooling system, the cap on the top of the...
Why did you change the water pump? Was the engine overheating? It is possible that the new Aisin water pump that you installed is faulty.
Change the engine water pump ASAP! Do not drive at highway speeds or long uphill climbs until the pump is replaced. I recommend only using an OEM...
