I have hyundai accent 1.5 model 2000

127000 mile

I was had fault code p0422 and when try to remove (oxygen sensor) can't remove it I cut the electrical wire to remove it but I can't

after that I have (p0135)

I get (DW40) and I remove (oxygen sensor) and replace it by new one and remove the battery the (check lamp) was closed

after 40 miles (check lamp ) opened
and have this code (P1123) I was change all Spark plugs NGK, and Spark Plug Wires , and remove battery

after some miles (check lamp) opened

I remove (maf) and cleaned it and return it

what can I do again for resolve this fault code