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Check Engine Light On with rattling sound

Discussion in 'Gen 3 Prius Technical Discussion' started by Zakir, Jul 1, 2024 at 4:54 PM.

  1. Zakir

    Zakir New Member

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    Location:
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    Vehicle:
    2011 Prius
    Model:
    Five
    HI
    I have been driving my 2011 Prius for the past six years. When I purchased it in 2018, the mileage was 85,000. Currently, it has 250,000 miles. Recently, I've noticed a rattling noise when starting the car in the morning or intermittently while driving, accompanied by the check engine light coming on.

    I took the car to Midas, where they replaced the ignition coils for the first and second spark plugs. However, the check engine light still turns on and off, and the rattling or shaking persists. The technician recommended an EGR cleaning, which would cost an additional $800.

    Given this situation and my lack of alternative transportation, what would you advise?
     
    #1 Zakir, Jul 1, 2024 at 4:54 PM
  2. ASRDogman

    ASRDogman Senior Member

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    It's likely your head gasket. Have you noticed your coolant level going down?
    Don't waste your time with the spark plugs or coils.

     
    #2 ASRDogman, Jul 1, 2024 at 7:23 PM
    Brian1954 likes this.
  3. bisco

    bisco cookie crumbler

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    I have to give Midas credit for understanding the egr problem, that’s more than most Toyota dealers do
     
    #3 bisco, Jul 2, 2024 at 4:23 PM
  4. Dduelin2

    Dduelin2 New Member

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    It's easy to block off the EGR valve to check if it's sticking and causing the intermittent rough running condition reported. If you have a lead on a trusted mechanic ask him for check the trouble code(s) behind the check engine light and perform a compression leak down test to check integrity of the head gasket.
     
    #4 Dduelin2, Jul 2, 2024 at 6:05 PM
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