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perhaps the plastic wore loose in the plug itself, or the little piece in the pin that catches the plastic slot in the ecu plugs are bent/worn/whatever.
for the time being, try just shoving something in there to hold it tight. i've done this using a toothpick. but i would try unplugging it from the ECU. maybe they just need to be re-set into the large blue plastic plug.
EDIT: if it ends up the metal pins are in good condition, but the plastic plug itself is cheesed, i have a knackered KA harness i can just take the blue plug off and send it to you.
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