engine light is on. on 2000 Ford Escort

obd code is p0133. any idea on how to fix this. the o2 sensor is only a year old.

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1 answer
'Have' the FRONT O2 sensor circuit checked, if the circuit is ok, replace the sensor with with one of better quaility. Assuming that the engine has NO other combustion issues, ie head gasket, flooding, exhaust leaks etc...