system too lean, bank 1 and 2?
hey guys.. i recently just gutted and my two larger rear cats on my 02 5.4L f150.. with no muffler and my pipe is cut off right after my passenger side o2 sensor.. i got my SES light on and got two codes.. system two lean on bank 1 and 2. my question is.. which o2 sensors are bank 1 and 2??? i did the GottsO2 mod on my two rear sensors.. did i need to do it on all four???
any help would be greatly appreciated guys.. oh and will this affect my trucks performance at all??
Last edited by qwerty; 01-27-2010 at 02:19 PM.