Need to replace sensors on a 2000 Camry V6?

Question

Check engine light on, scanned and came up with trouble codes P1135 and P1130. Apparently I need 2 oxygen sensors or A/F sensors as Toyota calls them. One is heater circuit response, the other is range/performance. My question, is my gas mileage being affected by both these sensors being broken or is it just one, could I get away with replacing just one of them right now and replace the other down the line, if so which is the one i should replace that is going to better my gas mileage?

Answer 1

my answer is try to check it out first on auto repair shop...,