Blown head gasket, bent #2 connecting rod, weighing options

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by bptahiti, Apr 16, 2026 at 7:34 PM.

  1. bptahiti

    bptahiti New Member

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    2013 Prius 2, 320K miles, mostly highway.

    Short version: In the middle of replacing a head gasket, and found the symptoms of a bent rod #2, and trying to decide what to do.

    Longer version:
    Had some death rattle episodes during one short drive (less than 10 miles), and had a check engine light by the time I got home. P0302 code. Decided to replace spark plugs in the hopes that could be it, since it has probably been 100K since those were done. Seemed better on first crank up, took it around the neighborhood to test it out, seemed OK. Was going to take it on short trip as another test, bad rattle, check engine light and P0303. Dove into head gasket replacement research and supply gathering. Fumbled my way down to the head gasket, found cylinder 2 with coolant in it, blown head gasket. Cranked it around and piston 2 comes up a little short of piston 3, with no wiggle when I push on the piston, where there is wiggle on the other 3 - from what I have seen/read, that should confirm #2 rod is bent. So, my options seem to be:
    1. Slap the new head gasket in and hope for the best? Is this at all reasonable? Can it survive with a bent rod? It seems to spin ok without obvious binding, but would there be further tests to see just how bad it is on the spectrum of bent rods? Or would it be a ticking time bomb no matter what?
    2. Try to tackle the rod replacement myself. What am I in for here? A couple posts seem to suggest it MIGHT be possible to replace #2 rod with the engine in place, but sounds iffy, and may be better off trying to pull the engine? I don't have a hoist or stand, so that is an issue I would have to solve. How much more work is the rod replacement past the point of getting to the head gasket? More specialized tools needed?
    3. Switch from repair mode to a JDM or other engine swap? Every post I see where this comes up there seems to be the side that says you have no idea what mileage or condition you are really getting and no meaningful warranty, and the side that says "why are you going through all that trouble when you could just swap the engine for X$? Still have the issue of no hoist, but similar question from option 2- how hard is the engine swap compared to the head gasket?
    4. Hand it over to a pro. Assuming I would not likely get a discount on the work for handing them the car with the head off compared to them starting from scratch, this seems to me like out of the realm of what it would be reasonable to spend on a car with 320K miles, but what would you expect to spend for a professional engine swap?
    5. Bid the old girl farewell and start searching for her replacement. She has served me well for years. Would be sad to see her go and add a car payment to the budget, but I also need a reliable vehicle in short order.

    Am I missing an option? Is there a clear winner amongst them?
     
  2. douglasjre

    douglasjre Senior Member

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    I would get a used JDM motor from Fleabay
     
  3. frodoz737

    frodoz737 Top Wrench

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    Even if you choose to repair or replace the engine, the reality is your car still has 320,000 miles on the clock.
     
    #3 frodoz737, Apr 17, 2026 at 2:42 AM
    Last edited: Apr 17, 2026 at 5:36 AM
    Brian1954 likes this.
  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Consider a new short block?
     
  5. WICruiser

    WICruiser New Member

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    320k miles puts it into the "time to replace it' category. Anything can be fixed but if you put in a different engine you still have a 13 year old car with very high miles waiting for the next failure.
     
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Maybe. @NutzAboutBolts and @ASRDogman are both over 300k miles IIRC, and have done recent head gasket replacement. They both are/were professional mechanics I believe.