I had the 1179 sometime back and couldn't trace it. Had new O2 sensors already and made no sense. Turned out there was fraying wires from the sensor wires to the harness behind the block.

 

Well the CEL came on today with three codes

P1177 Current
P1179 Current
P1177 Pending

Front O2 sensor replacement didn't seem to do anything. But the CEL took longer to come on this time. All the wiring is ok for the O2 sensors as well.

I really don't know what to do now. Would love to throw parts at the problem but I don't have that kind of money. Could it be the MAF? I've cleaned it and will do it again today. Any way to test its functionality? Black tape over the CEL seems like a great option now.

Thanks again

 

I installed the original front O2 sensors into the back. And the codes went away. And the long term fuel trim is getting closer to zero.

So to recap, the issue was the rear O2 sensors.

Thank you everyone for the help.

 

That is kinda strange because my understanding is that the downstream (rear) O2's don't do anything but test to see if the cat is functional. It is the upstream O2's that determine fuel trim, timing, and such. I could be wrong. Happens all the time.

In any case, good to hear your truck is improving.

 

Thanks.

You are absolutely correct on the functionality of the O2 sensors. I think it's weird too because the downstream O2 sensors have nothing to do with performance. I guess it's just one of those Land Rover things .

 

It is possible you just needed to get it through a few drive cycles before the changes started to occur. Part of the 'learning' process of the ECU.

In any case, congrats!