A month ago, my 95 E320 (143k) sedan's check engine light (CEL) came on. I sorta ignored the problem since the car ran fine and that I passed the emission test about four months ago and there's no funny noises, poor gas mileage or odor. Then I started doing some online research and found out that I can get the fault code by pressing the button black button near the battery. I got code #5 and #9.
#5 = egr inoperative
#9 = intake air temp sensor-open or short circuit

I decided to take the car in to the dealer to get the full diagnosis. They determine that it's the egr pipe is clogged and the egr valve is functioning properly. He didn't even mention the intake air temp sensor. He wanted $1200 to replace the egr pipe. So I was wondering how much this part costs and what the part # is so that I could possibly buy the part and have my local mechanic replace the pipe.

Also, is the intake air-temp sensor the one that's near the air filter?

Thanks in advance.