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 high-pressure turbocharging stage comprising a high-pressure compressor (6) with a sensorless compressor bypass valve (17), comprises evaluating at least one sensor signal of the turbocharger arrangement (2) for detecting a failure mode of the compressor bypass valve (17).