How much would it cost to replace both 02 sensors at the stealership?

 

no, no...that would me you are giving up, don't do that. Trust me going around and measuring resistances and voltages is much easier than it sounds, you just need a flow chart like I said...see if you can find someone here nice enough to loan you a manual.

...and people quit telling him the O2 sensor , I know you all had problems with your 02 sensors, but it may or may not necessarily be that, it's better to get a voltage reading on it before replacing it, especially since a sensor can be like $100 sometimes.

 

most likely the mass airflow sensor, which is a warranteed fix if you bought an extended warranty.

 

The P0171 code typically comes from a dirty MAF, and they get dirty every 30K miles or so.

Clean the MAF

Pay attention to MAF4.jpg and MAF5.jpg, being sure to clean the hotwires themselves. Spray carb cleaner works well, its a 10 minute job.