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Thread: Trouble code PO463

  1. #1
    Registered gunape's Avatar
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    Default Trouble code PO463

    I went to emissions and failed. The codes they got were PO138 and PO463. The 138 I should get as the cat is empty, but the PO463 is "fuel level circuit high input" I can't get my TJ registered until I fix them both. Cat is on the way, but how do I fix the 463. Thanks.


    Spark
    98 TJ...30x9.50 on Gambler rims, and Rubi springs
    08 Sprinter 2500
    2002 Super Glide T Sport


    USN 66-70
    DD-697
    DD-853

  2. #2
    Monkey Wrench! JWebber's Avatar
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    Quote Originally Posted by gunape View Post
    I went to emissions and failed. The codes the got were PO138 and PO463. The 138 I should get as the cat is enmpty, but the PO463 is "fuel level circuit high input" I can'r get my TJ registered until I fix them both. Cat is on the way, but how do I fix the 463. Thanks.
    Your getting that code becuase the cat is bad, replace cat, then reset computer, or should I say clear the codes and see if it comes back. P0463:jason:

  3. #3
    Registered gunape's Avatar
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    Ok...but what is PO463 related to, and why is it thrown for a bad cat?


    Spark
    98 TJ...30x9.50 on Gambler rims, and Rubi springs
    08 Sprinter 2500
    2002 Super Glide T Sport


    USN 66-70
    DD-697
    DD-853

  4. #4

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    Gunape-

    Where in CT are you? I need to hit some trails with someone

    Eddie

  5. #5
    Registered gunape's Avatar
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    Bethel...how bout you?


    Spark
    98 TJ...30x9.50 on Gambler rims, and Rubi springs
    08 Sprinter 2500
    2002 Super Glide T Sport


    USN 66-70
    DD-697
    DD-853

  6. #6
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    The computer monitors the fuel level in your tank because OBD2 emissions require that the tank be tested for vapor leaks. The computer will only do this with a certain amount of fuel in the tank, so it has to know how much fuel is present. The code is basicly saying the computer sees the wrong voltage on the signal line, instead of say,5 volts expected, it sees 12. So either your fuel level sensor in the tank is bad, the computer is defective or there is a wiring problem.

  7. #7
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    I am getting the PO138 while driving. No Codes at Idle and no Check engine. Occasionally when driving down the highway I'll get some sort of hiccup / stall / whatever you want to call it and then all is well. Could this be the rear O2 or Cat? Front O2 was replaced around the first of the year.
    C. Blaylock
    99 Jeep Wrangler Sahara 4.0L
    4" lift 33 x 12.50 15 Pro Comp M/T's

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