Lotsa Lights On! CEL etc.

All,

Happy Thursday!

Help!

I'm experiencing the following with my 2002 Audi A4 3.0 82000 miles:

*Check engine light ON- flashes (stays still @ times)
*Hood light- blinks as though the hood is not closed; however it is. (I think this is a broken sensor?)
*Service Light ON- abt a week now

I'm taking the Audi to the dealership 1st thing in the morning. I requested a service which I was quoted $450 and the service manager suggested to get a timing belt job and oil change instead.....ONLY $1900. The service manager advised that he has seen too many times were the timing belt breaks before the owner manuals suggested replace. He also suggested that I get a service @ 90,000 instead. He wants to do prevented maintenance I guess? Also I took my Audi to Auto Zone today and my check engine codes read as follows:
P0741, P0302, P0303, P0301, P0300, P0015, P0021, P0421 & P0431. Will someone please explain what this means to me? Are these costly repairs. Could a GOOD mechanic easily work on Audi's are should I always have Audi certified technicians under the hood (dealership)?

Thanks in Advance,

If the CEL is flashing, you're not supposed to drive the car. To be on the safe side, you should have it towed.