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  1. M

    Help W/2003 Mustang Gt

    I do I have the stock catts and the code I am getting said o2 sensor bank 1 an 2 or something like that I replace all four because I was getting the same code every time
  2. M

    Help W/2003 Mustang Gt

    I did but after driving it for few miles the light come on again same code its it possible that the previous owner might of plug in a scanner For mods?
  3. M

    Help W/2003 Mustang Gt

    Hi I'm new in these page but I need some help please let know what you guys think I have a 2003 mustang and it won't pass the smog on CA because the scan read that it's the o2 sensor buy I already bought all 4 new from O'rallys an even then the service engine light it's on even if u drive it for...