i have a 2000 audi a6 quattro 2.7 code 1626 came up and check engine light Is on

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i have a 2000 audi a6 quattro 2.7 code 1626 came up. mechanic said repair front left bearings. was told that the wheel bearings had some sort of sensor inside that communicates with the transmission. is this true? i haven't found any bearings which appear to have a sensor inside.