My check engine light came on the other day and when i checked the engine code it said that the 02 sensor #1 was bad. Well i ordered a new sensor and it should be in today, but my question is which sensor is it? I have a 2002 wrangler with the 6 cylinder and there are 4 sensors on the manifold, 2 are up on the top near the intake manifold and 2 are down below after some canister looking things. Im pretty sure its one of the top sensors, but which one? would it be the one on the right or left? I should be picking up the sensor soon, so fast reply's would be greatly appreciated!