4th Gen EGR Maintenance

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by ColoradoBoo, Jun 14, 2025 at 11:24 AM.

  1. ColoradoBoo

    ColoradoBoo Senior Member

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    I know the 3rd Gen Prius needed the EGR cleaned but haven't seen anything about our 4th Gen.

    I have a 2017 and 2021 Prius and both have had zero issues but are both getting close to 50,000 miles and I'm wondering if the EGR needs maintenance.

    FWIW: Transmission job is a breeze in these cars....just drain and fill....I love owning Toyotas!!
     
    #1 ColoradoBoo, Jun 14, 2025 at 11:24 AM
  2. Brian1954

    Brian1954 Senior Member

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    There is no need to clean the EGR system on a Gen 4 Prius. The design of the Gen 4 was changed compared to the Gen 3. Do a search on this Gen 4 forum and you will find only a few threads about cleaning the EGR system.
     
    #2 Brian1954, Jun 14, 2025 at 1:05 PM
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  3. Mendel Leisk

    Mendel Leisk Senior Member

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    @jerrymildred, working at Tampa Hybrids, reported a 4th gen Prius owner insisted (against their advice) to get an EGR system cleaning. He reported the car had over 300k miles, and carbon build up was minor.

    I recall a press release for gen 4 (somewhere...), Toyota noted the car had a revised EGR system. They also keep pretty quiet, about gen 3 EGR...
     
    #3 Mendel Leisk, Jun 14, 2025 at 3:42 PM
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  4. ColoradoBoo

    ColoradoBoo Senior Member

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    Thanks, than I will put my EGR's in the category of "if it ain't broke, don't fix it!"
     
    #4 ColoradoBoo, Jun 14, 2025 at 3:46 PM
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  5. Mendel Leisk

    Mendel Leisk Senior Member

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    It feels very strange to me, saying "don't clean your EGR". :oops:
     
    #5 Mendel Leisk, Jun 14, 2025 at 9:05 PM
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