My car shows up check engine light with codes p0300 and p1135

Question

Will fixing the Air/Fuel Sensor to correct p1135 solve the other problem p0300
OR
Will I have to get the spark plugs changed or checked too to get rid of p0300

Answer 1

P1135 Air / Fuel ratio sensor heater circuit malfunction

On a Toyota the 02 sensor will not cause a mifire, On a cheverolet or GM product yes, the fuel strategy are different.Resolve the misfire condition with a P0300 . If you replace the 02 sensor and the misfire goes away either thats a miracle or you would be the first ever to have a mircle 02 sensor