I have a 1996 E300 it has left me hanging a half dozzen time the alarm will not dis arm can any on help

Mine does not work on the drivers door but it will disarm on the passenger door

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2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"

Semper Fidelis
USMC 1973-1976

Disconnect the infernal unit at the brain box (passenger footwell, under carpet) and don't look back. They all do this eventually and are a PITA to diagnose and fix.