Car alarm going off from duplicate key?

jdohe2002

New member
I had a duplicate key made for my 2002 Mitsubishi Galant. It doesn't have the transponder. I only use that key to open the driver's side door and trunk.
For the 2nd time in 3 months, something I did after gaining entry to the car has set off a car alarm of honking horn and flashing lights. What is causing this? To stop the alarm, the "original" key is inserted. Why does this only happen on rare occassions? I am not sure, but it may occur when opening the trunk with the latch under the driver's seat.
 
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