P0301 misfire on cylinder one

Discussion in 'Gen 2 Prius Main Forum' started by danielz000, Nov 23, 2025 at 2:21 PM.

  1. danielz000

    danielz000 Junior Member

    Joined:
    Jul 20, 2018
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    Location:
    London
    Vehicle:
    2005 Prius
    Model:
    Active
    Hey guys

    A few months ago I had some rough running and p0301 on my engine.

    I replaced all four spark plugs and the car has been doing ok since.

    When I replaced the spark plugs I *think* I saw some liquid in the spark plug hole for cylinder 1...

    I also *think* I swapped the cylinder 1 coil on to cylinder 3...

    The other day the car started to run rough and p0301 came back. The car's not losing any noticeable amount of oil or coolant and still returns +50mpg.

    Today I've checked cylinder 1 and it seems there was water in it again, about to the level of the top of the spark plug nut (the coil plug came out dry)...

    I'm thinking the water is a red herring (some how passing the coil gasket/boot) and unlikely to cause a problem.

    My thoughts are to replace the coil packs and see if this helps but I thought I'd check here to see if anyone has any thoughts or similar experience?

    It's a well looked after 2005 with 135k on the clock.

    Cheers

    Dan