egr stands for Exhaust Gas Recirculation. It's technical definition is "it decreases flame temperature by reducing oxides of nitrogen", or in lamens terms, it takes nitro out of the exhaust and puts it back in the cylinder. sometimes, the valve itself is'nt bad, just dirty with carbon and can be cleaned with a $2 can of carb cleaner. i'm not saying that is what the problem is, but it is feasible. sometimes, these mechanics will tell you, in your case, the valve itself is bad when it could only be a disconnected vaccum hose at the EGR solenoid. they get the extra money because a TPI EGR valve job is about a 2 or 3 hour job. at $50 an hour, it adds up quick when they actually only spent 5 seconds on it reconnecting the hose. i'm not saying that is what all mechanics do, but it is not uncommon. as for the power steering, without a decent knowledge of this system, tackling the problem is hard to do. i hope you find someone who can fix your car, or you do it yourself, but if you have any questions, ask us. someone on this site will know the answer. good luck!