Coming home from a doctors appointment last month the engine started rattling at a stop until I gave it a lot of gas and then it stopped and about a block later the check engine light came on, lucky I was by an AutoZone so I went in and had them put it on the code reader, got the code misfire in cylinder 2 .so of course I change the spark plugs and the coils which was overdue, while I was at it I also changed the Intake Manifold and EGR valve and the PCV valve. And no I didn’t clean them, Ordered new Toyota parts. Watched about 3 days' worth of YouTube’s about head gasket problems and diagnosis. Kept coming back to a company called “Gasket Masters”, so I gave them a call and asked if they can recommend any shops in the Vegas area. He told me we also do on site work and that he’ll be in the So. Nevada/ Utah area next week, I told him please pencil me in!!! I was his first stop before heading to Vegas. And at 8am on the dot a Mercedes-Benz van pulled into my driveway. He had every thing you could think of in their van, parts, complete engines, hoist. He said they seem to be doing more Prius GEN 3 and 4 gaskets than anything else. From the time he pulled in, to the time he pulled out it was 4 hours. an he's a absolutely great guy (Larry) to talk to, he has five shops in California the northern shops handle Northern California and Reno Nevada and the southern shops handle southern Nevada and Southern Utah. I told him that I love watching their videos, so much info. He’s the shaved head guy you can tell he was in the military at one time because all the instruction is kept pretty simple and to the point. After the engine was put back together, I was surprised about how much time it took to get the coolant bubbles out of the system and flashing the computer/ doing the diagnostic on all the sensors. So, if you live in California, Northern/ Southern Nevada or Southern Utah, I highly recommended him/them for Prius engine work. I kid-you-not theses' guys can do it with their eyes closed..... OK let’s go to the most important part ""the cost"". The Stealership where we bought our Prius from originally quoted us $4700 just for the gasket job nothing else. "Gasket Masters" does the gasket with a used but clean EGR, then all the diagnostic afterwards for $1950. And that is the fixed price for doing a Gen 3 or 4 gasket. Same engine. I hope you’re reading this Larry because you guys are a lifesaver.