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    puncle's Avatar
    puncle Posts: 5, Reputation: 1
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    #1

    Jul 15, 2009, 06:08 AM
    1999 ford escort fault code
    I've got a fault code p1131 lack of ho2s11 switches sensor indicates lean condition. Could someone explian this is it a bad o2 sensor and if so witch one?
    this8384's Avatar
    this8384 Posts: 4,564, Reputation: 485
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    #2

    Jul 15, 2009, 08:19 AM

    What type of vehicle do you have? The sensor could be faulty, or you may have a lean condition which is why the sensor isn't picking up a change.

    EDIT: Sorry, I missed that you put what type of vehicle you have in the subject. But the advice remains the same. Your best bet would be to take it to a garage that has the capability to monitor what the O2 sensors are reading at and if the upstream sensor is lazy or not reading anything at all.
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