no help on focus

ok i just replaced the oxygen sensor today. it made the engine light go off...annnnnnd thats about it, still doin that puttering shit like its about to run out of gas...i got a F'n problem here...someone help...

There are a million threads on this, many on the first page of the forum...just go look at some of them. It would also help if you confirmed that it's the SPI, as that would probably have a different cause then most of those threads I mentioned, as they're more about the Zetec.

its the split-port 2.0L ... the single cam one. seen it with my own 2 eyes.

well i just replaced the oxygen sensor like 2 days ago,and it was working fine for about 5 hours then started puttering again. now the damn check engine light is on again......

alright im the guy about to help him to put a fuel pump in this thing, save some cash on labor.

does a focus have an access route to the fuel pump and shit from under the back seat, or ... etc ? ... can anyone help out here before we tear into it ...

thx

Must drop the tank.