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That code indictaes a fuel trim problem. The adaptaion values will show how the system is compensating, rich or lean. If they are pegged at the 1.32 compensation value, then it's likely that the Air Mass Meter is faulty. If they are pegged low at .67, then it's likely that the fuel pressure regulator is on it's way out.
You need SDS to read the values.
Suppose the fuel trim adaptation value is 1.32 or over 1.10. Then connect a "known good" Air Mass Meter and drive the car, reread the values. If that corrects it, install a new AMM. This is what a good mechanic would do. If the problem is NOT solved by the AMM, then reinstall the unit. By paying for a solid diagnosis, you'll save a ton on replacing good parts. It sounds like you'll eventually replace both O2 sensors and a bunch of other stuff before you get the problem solved.
Why did you replace the EGR? The code P0170 is fuel trim and the devices that commonly fail that regulate the fuel trim do not include the EGR.
Also, the O2 sensors have their own series of codes, the P013X codes. If you're not seeing those codes, why are you starting your diagnosis with replacing O2 sensors?
I know that a vacuum leak can pop up a P0170, but on that car, it's the AMM or pressure regulator about 90+% of the time.
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