HELP! EGR sensors?

Hi everybody.

My SVX has been developing weird issues as of late.

Recently it was the check engine light, followed by not starting.
I had it towed to the dealer, he says that the battery is kaput, the electric control sensor needs replacing, as does the EGR control sensor, and front and rear bank oxygen sensors.

The car has 94,000 miles on it, but I barely drive it anymore.

He guoted me a price of $950 and says that this job takes 4 hours of labor. The majority of the job price is labor. (the price includes the installation of a door mirror that was a casualty of NYC street parking)

Does this make sense? I just want to make sure I'm not getting taken for a ride here. I don't trust the dealers in NYC.

Thanks!