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Gen 4 Spark Plug change

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Elt31987, Apr 3, 2020.

  1. Elt31987

    Elt31987 Active Member

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    Havnt seen a thread with a walkthrough. I know some members are well past 120K. I also know that the previous Gens were a PITA due to removing the wipers and cowl. Is that the same on the Gen 4? Anyone done a write up?
     
    #1 Elt31987, Apr 3, 2020
  2. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    #2 Mendel Leisk, Apr 3, 2020
    alanclarkeau and Elt31987 like this.
  3. Elt31987

    Elt31987 Active Member

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    Alright, looks much better than previous Gens as long as the Prime setup under the hood is similar enough to the Gen 4 non Prime. Thanks
     
    #3 Elt31987, Apr 3, 2020
    Mendel Leisk likes this.
  4. JakeCastle

    JakeCastle Junior Member

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    tried to change mine today. 2016 prius 3 touring. Had trouble using regular 5/8 spark plug socket, feels it's too deep. Ordered tools on amazon for extra deep sockets... wish me luck. might create a video for you tube. any one else having issues with spark plug removal? also getting confused using BOSCH 9603 vs BOSCH 9620... is there a difference?
     
    #4 JakeCastle, Jul 19, 2020
  5. JakeCastle

    JakeCastle Junior Member

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    tried to pull it off but this project is driving me bonkers... looks like the 9603 is for the 2016 prius c and the 9620 is for the regular prius. damn amazon had it listed wrong when i bought it a few months ago. Re-ordered plugs from amazon but prime shipping will deliver in 7 days.... Wth happened to next day delivery???!@@# damn covid. Might as well drop by the local autozone.
     
    #5 JakeCastle, Jul 21, 2020
  6. pjksr02

    pjksr02 Active Member

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    Sometimes buying from a Toyota dealer (online or locally) is advantageous, as you will get the correct, or an updated, plug. For example, the Gen-3 Prius plug was updated to a hotter plug, 5 years after release, but most places still list the original plug as replacement. McGeorge Toyota in Richmond has had very competitive prices.

    If the plugs are the same size as the Gen-3, you'll need a 9/16" plug socket. I had to run to AutoZone to find one after taking off my cowl. (I believe the actual size is 14mm).
     
    #6 pjksr02, Aug 7, 2020
    Mendel Leisk likes this.
  7. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Touring
    Here's 4th gen Repair Manual info on spark plugs. I see the dry-threads torque is still 15 foot pounds.
     

    Attached Files:

    #7 Mendel Leisk, Aug 7, 2020
    Singh Saab and pjksr02 like this.
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