I have these codes currently, I just want to make sure I'm changing the right parts.

P0174-System Too Lean (Bank 2)=upstream front of car?
P0171-System Too Lean (Bank 1)=upstream towards firewall?
P0401-EGR Insufficient flow detected=what part to get?
P0401-EGR Excessive flow detected=what part to get?

Anyone that can provide what part to get for the EGR codes would be most helpful,
Thanks
Eric

First I would like to congratulate my 2002 "The Perfect Storm" undefeated National Champions MIAMI HURRICANES*1999 Ford Contour SVT #206 00 SVT motor with Return fuel*Black-Tan*Cold Air Intake with 6" S&B Funnel Ram*Sho-shop off road y*Brullen Cat-Back 3.5" slant tips no res*Unorthodox racing crank pulley*Lotec Guage pod with Air/Fuel, Oil Pressure and Voltage*17" Image Tuners*215/40 Falken Ziex's*
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