2010 Prius with possible clogged EGR

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Newpriusowner91, Jun 26, 2026 at 6:24 PM.

  1. Newpriusowner91

    Newpriusowner91 New Member

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    Hi all, I’m a new Prius owner as of last week. I bought it used from a small independent owned dealership. 2010 Prius with 186k miles on it. Second day of owning it the check engine light popped on. Went to auto zone and the code P0401 popped up. I contacted a few mechanics near me and both had no desire to clean the EGR or even look at it! I found a mechanic literally 2 minutes from my house who said he does do EGR cleanings and repairs and to drop the car off on Monday.

    I’m obviously worried what this will cost me. Google and a few Reddit peeps told me to clean it the range is $600-900 and a full repair is $1500 average. I’m not too happy but I love this car! I’ve only had it a week and I love it, I’m getting 44 miles to the gallon ( I drive around town that’s about it) I haven’t taken it in the highway yet because I’m worried about this EGR or whatever it could be causing the engine light to pop on.

    If the EGR is the reason for the light should I get it cleaned every 50k miles? I hope to keep this car for years. I have it paid off so at least whatever goes wrong I can fix and not worry about making monthly payments for a car that is old with a lot of miles on it.
     
    #1 Newpriusowner91, Jun 26, 2026 at 6:24 PM
    bisco likes this.
  2. bisco

    bisco cookie crumbler

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    congrats and welcome! no warranty from the seller? you'll need a code reader for the engine light, could be as simple as a loose gas cap
     
    #2 bisco, Jun 26, 2026 at 9:08 PM
  3. ChapmanF

    ChapmanF Senior Member

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    Two conditions can contribute to low EGR flow and a P0401 code: clogging, and a rutted ski jump in the valve actuator. You might have either one or both. Whoever looks should check for both.

    Of course, the extra-simple causes are also worth checking, like something just plain stuck, or an issue in the electrical circuit (which would give P0403 if obvious enough for the car to detect it).
     
    #3 ChapmanF, Jun 26, 2026 at 9:11 PM
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