fc3s1991

2000 es 3000 with 105,000 miles pearl white i bought this car for my mom about 3 years ago from first owner. last year i replaced both a/f sensor both vvti oil sensor, timing belt all plugs and valve cover gasket. two weeks ago mom call me about check engine light, i pickup car from here and after reading codes i get p1135 and p1155. i was like the sensor already went bad only 13000 miles on them, i order new sensor and installed them clear codes and after a few driving cycles light came back again.