Why might my car not start?

Depending how often that happened and how long it runs it is a normal behavior. Modern cars use computer to read the pressure in the fuel system. When pressure is low computer start the pump for maintaining the optimal fuel pressure for an easy start of the engine. For example I own a VW from 2003 and fuel pump starts running for a couple of seconds when I first open the driver door after a long period of time (2-3 hours). If fuel pump runs very often or for more than 5 seconds could be for 2 reasons: 1- fuel leaks (could be minor but loose the fuel system pressure) . 2- the fuel pump is no longer in best shape and make no more the optimal pressure, but in this case you will have also engine lacks of power and other engine problems like hard starts when engine is cold. So if your fuel pump starts from time to time for 2 or 3 seconds you don`t have to worry about

CHECK FOR CODES FIRST. DID YOU REPLACE THE FUEL FILTER?

Sounds like a programming or electonic problem If it was to replace an ignition switch, the dealership may have flashed the computer with the wrong information to operate you vehicle or match up with the replaced part.. You will most definitely have to take it back.

The first place to start would be with the new ignition switch.What you are saying sounds like a defective switch.

Some vehicles have an impact switch that shuts the fuel of, in event of an accident, give your Honda dealer a call they should be able to tell you how to activate it

With the problem with the battery draining, Get the chargeing system check out, End tell them all so to check for a short, As for the problem with the oil gauge change the oil pressure sending unit,

Hello
Due to the collision a frame was damaged - that's why your headlamps are not lighting the road well. Try taking off the front bumper, headlamps, grill, fender and take a look for bended frame. I would take a hammer and bend the headlamp connections so that all the lamp turn a few degrees upwards. Then when you put everything back together - use your headlamp height regulator to make the beam light properly.
Hope this helps.

NEED TO LET A BODY SHOP CHECK OUT FRONT UNIBODY STRUCTURE FOR DAMAGE WHEN YOU HAD A FRONT END COLLISION. IF FRONT STRUCTURE BEND OR DAMAGED. THE FRONT BUMPER AND HEADLIGHTS FRONT WHEEL ALIGNMENT GOING TO BE OFF.SOUND LIKE FRONT END COLLISION IMPACT DAMAGED THE FRONT UNIBODY STRUCTURE.

hallo
I dont belive it is air that is cousing your problem. Think it is more an electrical isue. I have had some problems with relay module (engine bay, near engine computer). And check fuel lift pump.
hope it helps
Marko