I hate taking my car to the stealership!!! I took my 1997 E420 to autozone for a check engine light check and the results were: cylinder misfire #7 and catalyst efficiency low-bank #1 (o2 sensor). I just need help with the procedure for changing an o2 sensor

 

what was the code?How many miles on the car?You may need to check the cats also.
Let's start from there and proceed.

 

I dont know what the cats is? the code is P0422 and P0307. I took it to autozone and that was on the receipt. as far as the miles, 145000. The car drives rough. When its in drive, and your stopped at a stop light for example, the car feels like its shaking. Now I did replace two of the cylinders at the stealership approx 7 months ago. I seen an universal O2 sensor online http://www.car-stuff.com/carparts/me...W45e4a7e90676a
They sell both the 2 and 4 wire. The thing is, they are selling it for $20. Im kinda spectical because all the other stores are selling it between $90 & $115. Can I use these? http://www.car-stuff.com/carparts/me...sos-40001.html

If yes, then heres a cheap place to get them, if not then does any one have a better lead?