Method for operating a turbocharger arrangement and control unit for a turbocharger arrangement

A method for operating a turbocharger arrangement (2) of an internal combustion engine (1), the turbocharger arrangement (2) comprising a low-pressure and a high-pressure turbocharging stage arranged sequentially, the low-pressure turbocharging stage comprising a low-pressure turbine (8) with a sensorless low-pressure turbine bypass valve (16), comprises evaluating at least one sensor signal of the turbocharger arrangement (2) for detecting a failure mode of the low-pressure turbine bypass valve (16).