hey i pulled that code with my OBD scanner today. I replaced that o2 sensor about a month ago its the bank 1 sensor 1. I think thats the very front one rite? the one next to the radiator. anyways wat is that code, does it mean its bad? someone got some input? maybe harness is bad or connection. let me know

 

Bank 1 Sensor 1 is the front sensor, rear bank. So its the one on the y-pipe closest to the firewall. Also called the front RH (right hand) heated O2 sensor.

Sounds like you replaced the wrong front sensor.

 

I'm a rookie here. Please tell me how many O2 in the Max.96 GXE? I know there is two for the front, but I'm not sure how many for the rear. Are they all the same? My car has a code 0503 and I want to replace 2 in front but I dont know where they located. I'd appreciated for your help.
Thanks