My car stopped staring so I replaced fuel pressure regulator that did nothing the battery went dead so I charged it it started I drove home went to leave later it didn't start I had it towed into shop they said they changed fuel pump relay and checked all wire connections they got it to start I took it home, in the morning I went to leave it wouldn't start I gave it back to shop they did something with some computer ,they disconnected the battery ,hooked everything back up and had to turn key to accessory and wait to hear fuel pump engage and then it started every time but the radio read locked I took it home it ran about two weeks and quit so I replaced fuel pump,spark plugs,battery and got nothing (this whole time car would crank but not turn over) the reason I changed the pump is because it quit engaging ,now when I turn key to accessery the computer goes crazy door locks start going I called dealer and they said I have to bring it in because the car computer thinks It's being stolen so they have to reset it . What is wrong with my car

At AMHD, we've seen a number of Pontiacs in the early 2000s that have had severe problems with the security system. Taking it to the dealer is the only thing you can do.