Prius Tire Valve Cap

Discussion in 'Gen 5 Prius Care, Maintenance and Troubleshooting' started by Gokhan, Oct 29, 2025.

  1. Gokhan

    Gokhan Senior Member

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    @Hammersmith, you could put the bottom line on this. What are the official part numbers for the OEM Gen 4 and Gen 5 tire valve caps? There are several part numbers. They seem to be for different model years.

    The dealer lost my OEM tire valve cap today while replacing a tire. :(
     
  2. Hammersmith

    Hammersmith Senior Member

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    2021 Prime seems to be 90942-05039. 90942-05038 would also work as it was superseded by 05039.

    Technically, the gen5 doesn't seem to have an orderable valve cap(you can only order the whole valve). I suspect 05039 would work on it, though. The valves for the spare tires are the same between the gen4 and gen5, so I have to suspect all the valve caps are uniform. 05039 is compatible with 37 models and over 1000 variants from 2003-2025, so that's probably the entire Toyota/Scion lineup over that span.
     
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  3. Gokhan

    Gokhan Senior Member

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    The only confusion is that there is also the 90942-A5002, which looks identical to the 90942-05039. Do you know the difference? I know my car specs the 90942-05039. Could it be that they are identical or there is a subtle difference such as one of them having an O-ring seal inside?
     
  4. Hammersmith

    Hammersmith Senior Member

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    I'm working on it. I wonder if it's something as simple as color.
     
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  5. Gokhan

    Gokhan Senior Member

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    No, they are both black, I think.
     
  6. Gokhan

    Gokhan Senior Member

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    OK, I think the 90942-A5002 might be cheapo ones vs. the 90942-05039 being made by Pacific. Mine came with Pacific-made ones.

    [​IMG]

    [​IMG]
     
  7. Gokhan

    Gokhan Senior Member

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    Here is the Pacific Japan web page:

    Products | Valve Products | Technologies & Products | Pacific Industrial Co., Ltd.

    And this their catalog:

    https://www.pacific-ind.co.jp/eng/product/valve/pdf/productguide_valve.pdf

    PVC25 is the correct tire valve cap for my car, and it has an O-ring seal inside according to the drawing, unlike the cheap Xtra Seal cap the dealer gave me today.

    Perhaps the two parts are identical after all. They look slightly different colors in these pictures (mine is black), but perhaps that’s the lighting. Or perhaps they are both made my Pacific but in different factories.

    90942-05039:

    [​IMG]

    90942-A5002:

    [​IMG]
    [​IMG]
    [​IMG]
     
    #7 Gokhan, Oct 29, 2025
    Last edited: Oct 29, 2025
  8. Hammersmith

    Hammersmith Senior Member

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    Makes sense. I believe a letter at the start of the second five digits often denotes an outside supplier(outside meaning not the ones used in the factory). AZ is an economy part(often found in brake pads - don't use them), WA is for BMW, WB is Mazda, YYZ for maintenance items. So 05039 is the factory part, while A5002 is a locally sourced part that conforms to the OE standard.
     
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  9. Hammersmith

    Hammersmith Senior Member

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    It's more likely that they're both made using the same specs(provided by Toyota) but by different companies. They might look identical simply because Toyota gave them the design and said make this for us.
     
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  10. Gokhan

    Gokhan Senior Member

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    Well, tomorrow I am getting three more tires and the service guy promised to give me four new Toyota tire valve caps. I will also check with the parts department to see what they actually have.

    Sadly, my tires are still like new, but I got five nails in about a year and decided to keep spare tires in the garage. They also have discontinued the Dunlop Enasave 01 A/S (the manufacturing date on the ones I have been getting is the 41st week of 2022) and I wanted to get them before they were gone. Slightly over $600 total for four tires installed with a two-year new-replacement road-hazard warranty.
     
  11. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Two pages on valve cap part numbers? Must restrain self…:confused:
     
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  12. VelvetFoot

    VelvetFoot Member

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    On a side note, don't buy fancy metal ones like I did for my MINI.
    Some kind of reaction took place with the AL(?) stems on the TPMS sensors and they became welded. Managed to break out 3 of 4.
     
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  13. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Yes, corrosion.

    and a PSA: any time you’re getting new tires, especially at Costco (if you’re not a fan of green valve caps), take the current ones off, put em in your pocket.
     
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  14. Gokhan

    Gokhan Senior Member

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    You need to be careful when getting tire valve caps for TPMS sensors.

    Two rules:
    • No metal caps allowed
    • Must have a rubber bushing inside to form an airtight seal
    I would refrain from cheapo aftermarket ones, though there are acceptable once satisfying the criteria above. See the technical drawing of the OEM Japanese Pacific tire valve cap PVC25 on the previous page.
     
  15. Gokhan

    Gokhan Senior Member

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    Green means nitrogen fill.

    Yes, it is a good idea to take them off at service, and I do that, but I thought at least the dealer would have common sense.

    It was a good thing I declined the courtesy car wash because the TPMS sensor would go into the carwash with no tire valve cap. It is not to mention the harsh brushes.
     
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  16. PhoS

    PhoS Active Member

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    Galvanic corrosion, didn't even think about that. There's no TPMS sensor in the spare though, they have normal rubber valve stems.
     
  17. Gokhan

    Gokhan Senior Member

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    The spare tire probably comes with the OEM Japanese Pacific tire valve cap CL shown in the brochure screenshot on the previous page. It is made of resin and has a rubber bushing like the PVC25 TPMS cap, but it is a lot larger and has a lot shorter thread and doesn’t have a lip inside.
     
  18. Gokhan

    Gokhan Senior Member

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    And an interesting observation: A small nonthrough hole on the top of plastic tire valve caps seems to indicate the presence of a rubber bushing.

    Metal caps naturally always come with rubber bushings, but they should not be used with TPMS sensors. TPMS sensors use the small cylindrical plastic caps with rubber bushings and long threads (not the large plastic caps with short threads intended for valves without TPMS sensors) pictured on the previous page.
     
  19. mingc

    mingc Junior Member

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    The small non through-hole and the protrusion on which it sits work very nicely as a tool to depress the valve to let air out. I assume that they were designed for that purpose.
     
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  20. PhoS

    PhoS Active Member

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    Misread this, didn't realize they were talking about caps. :barefoot:
     
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