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You'll have to read the adaptation values to get a better picture of what's going on. Check the fuel trim and I'm willing to bet it's on the high side or at 1.32. AMM failure is often seen through early symptoms like you describe. If you're seeing P0170 and P0173, you'd better check the fuel trim ASAP.
It's not good for the car to run lean or rich. Fix the problem...
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