Looking for a Gen 4: What are the Best and Worst Years?

Discussion in 'Gen 4 Prius Main Forum' started by c.ortiz108, Jul 30, 2025 at 8:57 PM.

  1. c.ortiz108

    c.ortiz108 Junior Member

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    After posting in the Gen3 section, I think I've decided to spend a bit more and get a Gen4 instead.... only to discover the whole heat exchange issue. From what I've read, it seems like it happens mostly with 2017s -- and surprise surprise, I'm seeing more 2017s listed for sale than any other year. So I have a few questions that will hopefully help me to narrow down my search:

    Does the 2016 also have this problem or was it just a 2017 quirk?

    What about 2018s?

    Are there any other known issues with specific years of Gen4s that I should be aware of? I know the 2022 is well regarded but they're also very expensive -- more than double the earlier years. I'm trying to stay in the $10k-$12k range.

    Somewhat unrelated: I'm also seeing a lot of cars with salvage titles, and claims from the seller that it was just the door, just the trunk etc. and is now repaired and like new. Is there any way to verify this? Or is it basically just never a good idea to buy salvage title car?
     
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  2. BiomedO1

    BiomedO1 Senior Member

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    Both 2016-2017 had issues that seem to clear up on the 2018 model year. The good news is that it's covered by your states emission warranty, if it didn't exceed those parameters.

    Re: Salvage titles; Do you think an insurance company would cut their customer a $20K check; instead of replacing a door, trunk, hood, ect.???? All you need to know is that the repair cost exceeded the blue book value of the car - therefore junked. Someone could've made one good car from two junk cars; but how safe is it to operate and did they fool or bypassed any safety sensors and replaced all the air bags?

    It's your money. I know some people don't care, if they get hit and the safety devices don't work. They also claim that it's safer to get thrown from a car, so they don't wear seat belts either.:rolleyes:o_O:sick::whistle:
    Darwin will eventually take care of that.
     
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  3. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    The 3rd generation cars had a similar heat exchanger. It doesn't seem to have leaked as much as the one in 4th generation cars.

    Most of that hassle is just checking the coolant levels to make sure you still have enough. Many Prius owners like living in the belief-bubble that zero maintenance is required, so they never checked, and then something expensive happened.

    Again, used cars are expensive lately and good used cars are very expensive.

    Salvage title cars are best enjoyed by the mechanically inclined.

    I don't like admitting it/thinking about it but $10k just doesn't buy a very nice car these days. Expect drama.
     
  4. c.ortiz108

    c.ortiz108 Junior Member

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    Okay, I'll rule out salvage titles. That was my instinct but just thought I'd check.

    There's a 2017 Prius 4 with a clean title and 152k miles on it for $10,800 (negotiable) on Facebook marketplace. I ran the VIN through a few free sites (including Toyota's) and it came up okay, no salvage etc. Seems like a pretty good deal -- near the lower end of private sale on KBB.

    Thinking of going to test it tomorrow. Anything specific I should look for? And will a paid VIN check get me much more info than Toyota and the other free sites?

    I'm wary of FB marketplace, but dealers are so expensive. The local Toyota dealer has a 2012 for $15k, and a 2017 Prime for $23k (though very low milage).

    There are a couple of others at similar prices, with somewhat higher mileage. I guess one good thing about being in the SF Bay Area is that a lot of people have Prii.
     
  5. BiomedO1

    BiomedO1 Senior Member

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    Watch the odometer, make sure it moves. People roll-back a high mileage cars and that usually breaks the odometer, won't move. Better yet take a picture of it before the test drive, then compare it after. Report them, if that's the case. That has happened to a few people here and it was here in Ca.
    If your not that familiar with cars, Pay a certified mechanic for an inspection. Losing $100 is better than being out 10K for a problem child.

    Good Luck...
     
  6. bisco

    bisco cookie crumbler

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    if the coolant leaked out, it overheated, and blew the head gasket, how will you determine whether or not the seller put stop leak in to disguise it?
     
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  7. c.ortiz108

    c.ortiz108 Junior Member

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    Good question. Any suggestions? I mean aside from getting a pre-purchase inspection.
     
    #7 c.ortiz108, Jul 31, 2025 at 3:39 PM
    Last edited: Jul 31, 2025 at 4:56 PM
  8. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    It is difficult to tell if that stuff has been used without destroying the radiator in the process, even for a pro.

    All I can say is look for the sucker when you're considering these candidate cars. If the price seems too good to be true, it probably is.
     
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  9. a2058

    a2058 Junior Member

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    Just another data point, 2019 Awde also affected by heat exchanger, I had to bypass mine…
     
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  10. c.ortiz108

    c.ortiz108 Junior Member

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    Seems to be quite a lot of sellers out there who flip cars for a living, mostly dealing with salvage titles but sometimes without. I'm detecting a pattern of poor communication, with long waits between replies and the absolute minimum of info provided. One or two even pose as "real" people, saying things like "I'm only selling because I'm moving" but then on their profile you can see they've sold about 6 cars in recent weeks. Hopefully I can find some honest individuals out there.

    The good thing is I'm not in a hurry. Hoping to get something by Oct.
     
  11. bisco

    bisco cookie crumbler

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    sorry, i have no idea. i just want you to be aware of possible pitfalls. it may be a risk worth taking, depending on your tolerance
     
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  12. Iron Man Prius

    Iron Man Prius Junior Member

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    RE: the sealant, sometimes if not most of the time you will see stains on the inside of the coolant reservoir bottle depending on what brand of sealant they used. That should be PINK PINK PINK always..never bronze colored or dark. If they added only a little bit, it will be harder to see.
     
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  13. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Seems like it was a good design on paper, has worked, and still works. Except, for whatever reason, they screwed up the stampings or welding or pressure testing. Whatever, not so much a design defect as a manufacturing defect.

    Has the inability to switch speedo between mph and kmh been mentioned. AFAIK it only on 2016 model year.
     
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