Question about 1999 Volvo S80

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Lamda sensor warning light arises some time after

Lamda sensor warning light arises almost frequently. Last time after a harder acceleration . It can be reseted by loosing the battery cable.
The airmass meter is renewed , but no improvement.
In the winter the problem frequency lower.
The idle run is uneven when lamda warning light is on but okey after reset.
One of the 2 turbos has a small oil leakage.
I am not sure if the change of lamda sensors is the right next step.
Could there be some problem with the throttle valve or temperature sensor?

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