Codes P3190, P3191 after replacing EGR cooler, egr switch, intake manifold

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by FrugalBeeotch, Oct 24, 2025 at 11:40 PM.

  1. FrugalBeeotch

    FrugalBeeotch Junior Member

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    I spent 9 hours replacing the egr system and the intake manifold. When I started the car, it said there's a problem with the hybrid system, and threw P3190 and P3191.

    Any idea what I did? I'm a little deflated. I thought I could do this. I clearly made a mistake.

    I left it at the diy garage overnight.
     
    #1 FrugalBeeotch, Oct 24, 2025 at 11:40 PM
  2. ChapmanF

    ChapmanF Senior Member

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    The codes are less specific than you probably hope: they're telling you the engine didn't start. (P3190 means it produced less than a fifth of the torque expected, i.e. didn't run well at all, and P3191 means that happened while trying to start it.)

    The problem could easily be something quite simple. An obvious way to start is by double-checking that you've reconnected everything that had to get disconnected to do the job.
     
    #2 ChapmanF, Oct 25, 2025 at 10:16 AM
  3. FrugalBeeotch

    FrugalBeeotch Junior Member

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    Yeah. I did some of that last night before the shop closed. I'm going back this morning. Maybe fresh eyes will help me spot the problem.
     
    #3 FrugalBeeotch, Oct 25, 2025 at 10:23 AM
  4. FrugalBeeotch

    FrugalBeeotch Junior Member

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    I had left a vacuum hose disconnected. I fixed that, but it's still throwing the codes.
     
    #4 FrugalBeeotch, Oct 25, 2025 at 1:13 PM
  5. Brian1954

    Brian1954 Senior Member

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    Does the engine run for more than 30 seconds when you start the car?
     
    #5 Brian1954, Oct 25, 2025 at 1:17 PM
  6. ASRDogman

    ASRDogman Senior Member

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    Clear the codes, and start again...
    How is it running? Smooth or rough?


     
    #6 ASRDogman, Oct 25, 2025 at 3:57 PM
  7. FrugalBeeotch

    FrugalBeeotch Junior Member

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    It wasn't before I connected the vacuum hose. Then it ran until the hybrid battery was sufficiently charged, and when it shut off the engine it sputtered briefly until the engine was off.
     
    #7 FrugalBeeotch, Oct 25, 2025 at 4:32 PM
  8. FrugalBeeotch

    FrugalBeeotch Junior Member

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    It runs smoothly until I need to stop, then sometimes it sputters to a stop. When I was pulling in the driveway, it sputtered hard. No check engine light or error codes.
     
    #8 FrugalBeeotch, Oct 25, 2025 at 4:34 PM
  9. ASRDogman

    ASRDogman Senior Member

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    You should recheck everything, slowly. If it was running okay before the work, and not after,
    something is not connected correctly.
     
    #9 ASRDogman, Oct 25, 2025 at 4:42 PM
    Mendel Leisk likes this.
  10. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Did you replace everything? With new or used" Definitely hang onto everything removed.
     
    #10 Mendel Leisk, Oct 25, 2025 at 5:26 PM
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