My Note 1.4 Petrol started to run lumpy, gradually getting worse during journey , but recovering a little after a rest . OBD II diagnosis of Engine Warning gave P00132 which was 02 sensor bank 1 . MOT Garage confirmed running rough due to sensor and so replacement fitted . Still failing omissions and so 2nd 02 sensor ( one after Cat ) also fitted ......... Still very borderline on Omissions , but running sweet again . Advised a New Cat will be required for MOT . Strange that either of these issues have developped after only approx 55000 Miles of steady driving , including short and long runs ( just had 1000 mile round holiday trip to cornwall without a blip ) . Is this to be expected , Can it be cleaned as per adverts , advice please .. Just spent 300 on new clutch , then 250 on 2 sensors and brake pads , now looking at expense of Cat .