P0442 "Evaporative Emission System Leak Detected (small leak)"
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Thread: P0442 "Evaporative Emission System Leak Detected (small leak)"

  1. #1
    FRESHMAN ROVER Gorf's Avatar
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    October 17th, 2011
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    Maple Valley, Washington
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    P0442 "Evaporative Emission System Leak Detected (small leak)"

    So I threw a "Service Engine Soon" light yesterday. Pulled out the scanner and got P0442 "Evaporative Emission System Leak Detected (small leak)".

    P0442 "Evaporative Emission System Leak Detected (small leak)"-lr_fault_code.jpg

    There appears to be a couple other threads on the forum with similar issues but no followup:

    https://www.rangerovers.net/forum/6-r...-detected.html
    https://www.rangerovers.net/forum/6-r...got-p0442.html

    So I thought I would start a thread, and first ask: Does anyone have any thoughts on where this leak is mostly likely occurring?

    Second, I thought that if nothing came up here in the forums I could at least use the thread as an anchor to document what I find in my particular case.

    So, any thoughts?
    '11 RR SC LUX
    Gorf

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  3. #2
    FRESHMAN ROVER Gorf's Avatar
    Join Date
    October 17th, 2011
    Location
    Maple Valley, Washington
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    Re: P0442 "Evaporative Emission System Leak Detected (small leak)"

    Ok so, first follow up. Biggs Automotive in Bellevue kindly threw the Range Rover on their system. They identified it as something to do with vapor leakage from the fuel system. We removed the gas cap and took a peek and did find some grime around the filler that might have been preventing a good seal. It might just be time for a new cap. Other than that, we talked about a pressure blow-off valve on the tank that might be a little faulty and then a motor that controls something in or around the tank that can allow some leakage. Biggs cleared the faults out of the system, cleaned up the gas filler inlet, and sent me on my way to see anything pops up again.

    tl;dr probably leaky gas cap, waiting to see if the error comes back.
    '11 RR SC LUX
    Gorf

  4. #3
    SOLIHULL ROVER
    Join Date
    September 22nd, 2008
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    2,252

    Re: P0442 "Evaporative Emission System Leak Detected (small leak)"

    This has been covered here I think... I vaguely remember having to replace some valve towards the front of the motor when my car kept throwing this code. It has something to do with regulating gas pressure in the fuel system... I think. Regardless I replaced the part and it hasn't been an issue since.

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