I have a 2004 Ford Taurus SEL DOHC that gives me gas cap, parking break and airbag lights when starting and also hasitates when it starts. Any ideas it is occassional for this to happen.

Question edited. So few words, so many typos!

All here and a couple of videos.

https://www.google.com/search?q=2001+ford+taurus+sel+3.0+camshaft+position+sensor+location

Well the gas cap light means the gas cap may be loose. The actual condition for the light to come on is when the engine computer tests the fuel tank venting system for leaks. The no start problem could have been too much or too little pressure in the fuel tank which could also make the gas cap light come on.

2004 Ford Taurus Workshop Repair Service Manual PDF Download

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is your brake fluid low if so top it off if that's not the problem do you have brakes if you don't have a good pedal they need bled out. you might need a new gas cap to if it doesn't seal right

switch for the parking brake is out of adjustment

just because the light is back on, doent mean its the same thing. thats a lot of money spent on just those problems. (WAY TOO MUCH) Take it back and have them ck it again, or find a shop that knows what they are doing.

Sounds like the transmission is slipping; take it to a shop.

YOU HAVE AN EXHAUST LEAK ON THE FRONT END OF THE EXHAUST SYSTEM.GET THAT FIXED ASAP! THAT IS CARBON MONOXIDE!

You can try to replace with a similar unit, but typically Ford ECUs have to be "reflashed" by the dealer. Ford has numerous calibration codes and various other vehicle specific information that can only be managed with Ford certified (dealer) programing devices. I hope this helps

voltage is not really the issue here, the amperage is the thing that make things go.
you battery may have 1 or 2A, but hte bettery still reads 12v.
are you getting any gas to the engine.?
try a new battery, and give it a short bust, not a long cranks. and give enough gas in between the bust.