Is Prius Gen 4 more reliable than Gen 3?

Discussion in 'Gen 3 Prius Main Forum' started by Mamalucy, Oct 20, 2025 at 2:41 AM.

  1. Mamalucy

    Mamalucy Junior Member

    Joined:
    Jul 31, 2019
    11
    4
    0
    Location:
    Culver City, CA
    Vehicle:
    2010 Prius
    Model:
    III
    Original owner, Bought 2010 early Gen 3 having some problems. 122,500 miles, wondering if better to get a newer Prius Gen 4. Don't care for the newest model.
    Any thoughts? Thanks!
     
  2. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
    12,492
    5,057
    0
    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    Yes

    But problems are limited to head gasket and piston rings...

    You can put a Gen 4 engine in a Gen 3 Prius and solve everything.
     
  3. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    12,781
    2,295
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Seems like a lot of hybrids are all of a sudden coming down the pike it's going to be interesting for sho. Even Lamborghini is going all hybrid.if I can figure out battery situation for gen1 volt it's one the better cars on planet . Easy to find cheap.
     
  4. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    7,475
    3,877
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Why would you get a newer car? What's wrong with the one you have now?
    And you don't like the way it looks, WHY would you spend money on it?

    If your car is paid for, and you like it, WHY get rid of it?

     
  5. Mendel Leisk

    Mendel Leisk MMX GEN III

    Joined:
    Oct 17, 2010
    59,751
    41,084
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Not sure about that. Getting 4th gen EGR to work in gen 3 is not easy, and afterwards many experienced overheat issues, resorted to modding thermostat.

    If our 2010 ever gets to that juncture, say failed head gasket and runaway oil consumption (which I suspect is pure cargo cult now…), the shopping list would be (gen 3) short block, engine overhaul gasket kit (Toyota, including head gasket), and replaced head bolts.

    And continue to clean the (3rd gen) EGR system periodically.
     
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    113,495
    51,641
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    overall, gen 4 has about the same reliability, if you don't count the brake actuator, egr circuit and head gasket.
    it has some different issues, but nothing too major. beware the leaky exhaust coolant heat exchanger on early models
     
  7. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    3,272
    1,721
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    This all depends on the honesty and experience of the mechanic you take the car to, especially if you don't know anything about cars. As a general rule, things usually start breaking around 150K miles on any car. This is where your mechanic's honesty and experience comes in. A smart and honest mechanic can usually get the job done, so that the repair will last - not necessary the cheapest. A shady, dishonest mechanic may also fix the problem, cheap but the repair will only last the warranty period he/she gives you.

    It comes down to; pick your poison - Cheap short term solution or slightly more expensive long-term solutions.

    Statistically speaking, the gen4's seems to have a better track record than the gen3's, but that may be because they are newer with less wear and miles on them....
     
  8. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    113,495
    51,641
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    well, you've got about 9 years on the gen 4. iirc, gen 3 issues started cropping up well before that