ECU codes P0420 and P1442

Discussion in 'General Motoring' started by Andy Leszczynski, Jan 6, 2006.

  1. Hi,
    My wife's 2002 Impreza 2.5 TS reports codes P0420 and P1442. First one
    is about the oxygen sensor - the diagnostic tool shows it works fine -
    there must be somre rare condition which triggers that. So I just choose
    to ignore it.

    However second one: 1442 - I can find what it means. Does anybody know
    what it could be?

    Thx in advance, Andy
    Andy Leszczynski, Jan 6, 2006
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  2. Andy Leszczynski

    xblazinlv Guest

    P1442 Fuel Level Sensor Circuit Range/Perf
    xblazinlv, Jan 6, 2006
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  3. Andy Leszczynski

    Bill Pelka Guest

    PO420 Catalyst System Efficiency Below Threshold

    P1442 Fuel Level Sensor Circuit Range/Perf


    This is what the chart that I have shows as the cause. Kinda Cryptic, but
    maybe a google will help decode this.


    What are the miles on this and has any work been done recently?
    Bill Pelka, Jan 6, 2006
  4. Andy Leszczynski

    Bill Pelka Guest

    Bill Pelka, Jan 6, 2006
  5. Andy Leszczynski

    Bill Pelka Guest

    Lists the P1442 as "EVAP Vacuum Switch Hi Volts during Ignition on". Might
    be a loose connection on the switch causing the detection circuit no to load
    down and the voltage to read high. Maybe a "Rodent" ate thru the wires, the
    connection came loose or there is corrosion in the connection. Good Luck...I
    have no idea where to find the switch or if Subaru even has one...

    Bill Pelka, Jan 6, 2006
  6. Andy Leszczynski

    calhoun Guest

    You must not be an area that has yearly inspections. Won't pass around here
    with a light on so ignoring it is not an option.
    For what its worth the 420 code is not an O2 sensor code. It is a catalyst
    problem code. There is an O2 sensor before the cat and one after the cat.
    The reading between the 2 is compared to determine if the cat is functioning
    properly. If you determined both O2s are working correct (as you stated)
    than it may be getting time for a new cat. Did you reset the code and did it
    come back on?
    calhoun, Jan 6, 2006
  7. Andy Leszczynski

    xblazinlv Guest

    WTF did my reply go? I replied last night and told you exactly what the
    error code was.
    xblazinlv, Jan 6, 2006
  8. Txh for all the input. I will reset the computer (by disconnecting the
    battery) and observe if it goes off again.

    Andy Leszczynski, Jan 7, 2006
  9. Googling gave this thread on another forum with more details on the P1442
    (including what to do about it):

    Michael Pardee, Jan 7, 2006
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