Little black box

Asked by Sep 12, 2019 at 08:35 PM about the 2003 Lincoln Navigator

Question type: Maintenance & Repair

I have an 03 navigator and I haven't done any mechanic
work on it yet but I have just found a little black box zip tied
next to the air filter that looks like a speaker with one
button on it with a sticker that says P3 and it beeps a low
beat but it still beeps about every 30 seconds to a minute I
held it for 30 seconds and it stopped what is this

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