96 tracker check engine light fraud?

[fixkick]

125 means the ECU can not control hot fueling rates. (lots or causes possible , we check the easy things first)
it means closed loop fails, closed loop means , fuel rates are not rich, but closely controlled by the ECU and the 02 sensors. at hot cruise and hot idle.
this is system is what allows EFI to get great fuel economy and as side benefit , low smog and CAT converter not burned up and damaged.