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Obd2 Ecu Not Learning Lambda Values?

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Ive been having a few rough running problems for a while now. This includes rough idle, very rich start up and slightly less mpg. I hooked up vagcom to take a look at measuring blocks as it doesnt show any faults. I noticed that the lambda values where high, rangeing from 10% to 20%? And there were no learnt values for idle and full throttle? Ive since replaced the lambda and have noticed a slight gain in mpg, but the readings are still similar? Ive now done about 200 miles since I disconnected the battery. Does anyone know what this could be, a faulty ecu perhaps? Thanks in advance for advice.

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