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1st Gen Tacoma 3.4L Code P0441

Discussion in '1st Gen. Tacomas (1995-2004)' started by sandersgtn, Oct 17, 2024.

  1. Oct 17, 2024 at 5:56 PM
    #1
    sandersgtn

    #1
    sandersgtn [OP] Active Member

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    I've seen several posts on code P0441. Here's mine.
    - Bought the Double Cab 4wd 3.4L last May with code P0441. Dealer said hose was missing from gas tank to EVAP system.
    - When replacing exhaust system I spotted missing hose and replaced. Code did not go away.
    - Looked for other cracked or missing hoses. None found.
    - Replaced gas cap with new OEM cap from local dealer. $32. Code did not go away.
    - Noticed that gas tank had vacuum when removing cap. Decided to replace pressure sensor from eBay. BINGO! P0441 code gone. New code P0420 appears.
    - New code apparently related to upstream air/fuel sensor. Purchased new upstream 02 sensor from eBay. BINGO! No codes.
    In hindsight, since the gas tank had vacuum when I removed the old gas cap, I probably didn't need to replace with new gas cap.
     
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    sandersgtn, Oct 17, 2024
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  2. Oct 17, 2024 at 6:13 PM
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    ControlCar

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    ControlCar My Moto: Help & Learn…period.

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    Clock Volt meter/LSPV Delete/Hyundai 16’s/FP gauge/after 9months of wrenching ZERO oil leaks
    Nice

    better to replace gas cap now than failing inspection and shop charges you $45 for a AM one!
    Money well spent.
     
    ControlCar, Oct 17, 2024
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    1 Limited Toyota likes this.
  3. Oct 17, 2024 at 6:25 PM
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    sandersgtn

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    sandersgtn [OP] Active Member

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    No inspections here in TN...
     
    sandersgtn, Oct 17, 2024
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  4. Oct 17, 2024 at 7:05 PM
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    ControlCar

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    ControlCar My Moto: Help & Learn…period.

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    Clock Volt meter/LSPV Delete/Hyundai 16’s/FP gauge/after 9months of wrenching ZERO oil leaks
    Lucky!
     
    ControlCar, Oct 17, 2024
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  5. Oct 18, 2024 at 12:44 AM
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    1 Limited Toyota

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    slowly erasing past owner hacks
    Caps are a common issue. Not bad insurance
     
    1 Limited Toyota, Oct 18, 2024
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  6. Nov 21, 2024 at 6:04 PM
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    Brangus

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    - Noticed that gas tank had vacuum when removing cap. Decided to replace pressure sensor from eBay. BINGO! P0441 code gone.

    Do you have a part number for that "pressure sensor"?
     
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    Brangus, Nov 21, 2024
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  7. Nov 22, 2024 at 5:50 AM
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    sandersgtn

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    sandersgtn [OP] Active Member

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    89460-04020
    Purchased on eBay. $55.99
     
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    sandersgtn, Nov 22, 2024
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    Brangus likes this.
  8. Nov 22, 2024 at 9:00 AM
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    Glamisman

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    Glamisman Well-Known Member

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    Did you clear all codes and they reappeared or are you expecting them to self clear?
     
    Glamisman, Nov 22, 2024
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  9. Nov 22, 2024 at 9:11 AM
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    sandersgtn

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    sandersgtn [OP] Active Member

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    I disconnected the battery. No codes reappeared.
     
    sandersgtn, Nov 22, 2024
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  10. Nov 22, 2024 at 9:21 AM
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    sandersgtn

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    sandersgtn [OP] Active Member

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    Correction - I had the upstream O2 sensor "heater circuit" code appear after fixing the emissions code with the pressure sensor. I replaced the upstream 02 sensor and no more codes.
    In all cases as chasing codes, I disconnected battery to reset.
    Good luck!
     
    sandersgtn, Nov 22, 2024
    #10
  11. Nov 23, 2024 at 1:18 PM
    #11
    Glamisman

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    Glamisman Well-Known Member

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    Some codes, especially evap codes are 2 trip codes meaning that the truck has to complete 2 cold start cycles.
     
    Glamisman, Nov 23, 2024
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  12. Nov 24, 2024 at 6:45 AM
    #12
    sandersgtn

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    sandersgtn [OP] Active Member

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    Didn't know that. I did have a "check engine" light after replacing pressure sensor. Restarted several times and light didn't reset. Went to local Advance Auto to check code and discovered new upstream 02 sensor code. EVAP code was gone and replaced with new. Proceeded with O2 sensor replacement and now good.
    Thx
     
    sandersgtn, Nov 24, 2024
    #12

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