2011 Prius Loud rattling and shake upon start and idle speed

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by 2ewes4me, Feb 23, 2020.

  1. 2ewes4me

    2ewes4me Junior Member

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    A while back, our 2011 Prius (238,000 miles) started up one morning, and several dash lights (battery, skid, brake, engine) lights appeared, and intermittently have been off and on since. They weren't on when I went to Toyota for an oil change last month, although I did mention it, then forgot to follow up. I've noticed my gas mileage was down, but not drastically.

    Yesterday as the lights turned off (about 3 minutes after leaving the garage) I was just about to enter a parking lot, and as I slowed, I heard a loud rattling. The check engine light came on.

    Today I drove it- engine light still on- to church. It was loud when started, but noise disappeared once I wasn't at a low/idlel speed. Afterwards I stopped at an auto parts store where the young man plugged in his computer and said the reading was Cylinder 3 misfire and EGR valve/sensor.

    I saw an earlier post about cleaning the manifold, but we have zero mechanical ability.

    Is the car safe to drive, or will I damage something by driving it?

    I'm wondering if my only option is to bring it to the Toyota dealership?

    Has anyone had similar problems and if repaired by a Toyota dealership, can you share approximately how much I am looking at spending to repair it?

    Please share any suggestions

    Thanks,
     
  2. bisco

    bisco cookie crumbler

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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Head gasket

    Try to find a decent Indy mechanic
     
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  3. 2ewes4me

    2ewes4me Junior Member

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    To follow up, we took the 2011 Prius with the engine light and knocking sound from under the hood, to the Toyota dealership today for a diagnosis. Their computer gave the same codes as O'Reillys- misfire of cylinder 3 and EGR valve. Their bid to clean pipes leading to manifold, manifold and EGR valve replacement is $1,240.

    Have you had this done recently? Was the price similar?
    Does it pay to check with a local shop that would likely not use Toyota parts, or would you think Toyota mechanics would be familiar enough to get the job done well in the least amount of time?

    Wish it was a recall issue that was covered!
     
  4. pjksr02

    pjksr02 Member

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    Location:
    Connecticut
    Vehicle:
    2010 Prius
    Model:
    III
    There are a bunch of threads on this issue on this site. It's a common problem, and may be the Gen-3's Achilles heel. The linked blog above explains it pretty well.

    Cleaning the EGR system and the intake manifold can be done for about the amount quoted. However, some owners have reported that by the time they get error codes, the engine's head gasket has been damaged.

    I'm newer to this, and never had a code pop up, knock on wood. Perhaps someone else could chime in on probabilities, or whether it's advisable to compression test for head gasket integrity at your point.
     
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