My check engine light came on so I hooked a code reader up to it and it gave me code 0141 and 0135 so I looked them up and it is the 02 sensor heater circuit malfunction ( bank 1 sensor 1) AND 02 SENSOR heater circuit malfunction bank 1 sensor 2) which one are those? They the downsteam ones? I don't know

Sensor 1 is the one closest to the exhaust manifold and sensor 2 is the one in or closest to the catalytic converter.

The number 1 sensor is first inline and the number 2 sensor is the second one in your exhaust system. If this is a 6 cylinder then it would be right and left bank respectively.