2004 Mercuray Wont Start

Impala's are famous for ignition issues, are the interior lights of your dash coming on when you want them, or just by themselves? The clicking after you turn off, I would check the security system, i.e., remote clickers, cars computer, key chip, ect. Sound like your alarm is attempting to engage

Sounds like starter is gone

Go to advanced auto parts and ask for their code scanner and see what codes come up. Its a good place to start. Sounds like a sensor problem

Check battery connections and cables. Ground may be broken. Remove cables and clean battery posts then reconnect cables.
Check ignition switch, replace as needed.

Can you tell me if it was in fact the starter? I have an 04 Ford Taurus with 99K miles on it. This week when I started it up, not everytime but often the abs, brake, tire and traction control lights will stay on. Also the computer display will read either park brake engaged or passenger door ajar. I turn it off and start it again and the issue goes away. This morning it acted as though it had a dead battery and I had the clicking sound behind the dash as well as the vibrating needles. Thanks!

dealer only factory immobilisor has cut in

Sounds like your ignition switch is faulty.Not the key switch. The ignition switch itsel is at the lower end of steering column. Good luck.

First, look for broken or loose wires in the ignition circuit, and the coil wires. Then try fuel filter. Then, ignition module, coil, and timing. It could also be dirty or clogged injectors.

yes the gauges should go up and down they are selftesting your starting problem could be starter related they were having problems with those, also try turning ignition to the on position for 3 seconds before trying to start,also gm has a tsb for hard start issues

Try replacing the fuel sending unit first. Then check your ignition relays. Are you ruining any codes. because for the most part your truck will tell you whats wrong if your pump is bad it should run a low fuel pressure code and if there is something with the ignition you might run a oxygen sensor code. when you turn it over do you smell gas.