i knew that i had to change my o2 sensor, but i didn't remember which side so i took it to advanced auto parts and they ran a scanner on it and they couldn't pull any codes at first. so they did a engine running check and it came back 10,172,173,111. the 172 and 173 is o2 right side lean/rich in that order. so i guess the o2 is all jacked up and needs changing. i think the 111(pass) means a separation between the codes. what side is the right side anyway? pass or driverside?