2004 Charade Lambda Sensor

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Hi I have a 2004 Charade with the 1.0L EJ-VE engine. The MIL light has come on the dash board and my fuel consumption has gone up so I am suspecting lambda sensor is the problem. Does anyone know where I can find a good quality replacement part for a reasonable price without going to a main dealer? I am not sure if the part is the same as the aygo/c1/107, maybe that would be a cheaper option if it will fit?