where is the trunk release on a 99 Pontiac Sunfire
obtain access from back passenger seat and pull aux cable or force lock open, See if you can make the latch work by just using a screw driver in the slot to lock it, then open it with the key. If that works ok, you will need to raise the striker and align it to the latch.
I believe your car has a cable latch and the release is located along the bottom left edge of the driver's seat towards the front.
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