O2 sensor

Hi, with your help I have found the problem with my 2005 ford escape, lean problem. It was recently in an accident and I found a hole about the size of a toothpix in the plastic intake manifold I is it possible to plug this small hole? Its a 2.3 4 cyl.
Thank you, dino moretto

2005 Ford Escape 6 cyl 116000 miles

I recently had my check engine light come on and off. I went to a mechanic and had the codes p0153 and p2198 pulled. Each code specifies that there is something wrong with the o2 sensor at bank 2 sensor 1. After much discussion, this lead me to believe that I need to have that sensor replaced.
How much should I be paying for the replacement part? Does anyone know how much a Ford specific part cost or if it is necessary to use one? I called around to places and they are charging around 140-150 for the sensor itself ( are they using a higher quality part?). I feel this is excessive, since they are on sale at Advanced Auto for 60. Should I be paying this much for a part at a auto repair shop?
Would it be better for me to buy an universal part myself and find a shop who will put it in for me?