This paper concerns the Fault Detection andIsolation (FDI) problem for a class of Switched Linear Systems(SLS) subject to sensor faults and unknown boundeddisturbances. The main work is based on the design of ageneralized switched observer scheme. The FDI problems havebeen solved by using a robust control techniques. A suitabletrade-off between the robustness to disturbances and thesensitivity to sensor faults was obtained. The main results arereformulated by using Linear Matrix Inequality (LMI)formulation. An example is included to illustrate the efficiency ofthe proposed approach.