Hello. I have an 06 expedition that's giving codes p0141, p0161 and p1100.
I replaced both rear sensors and checked the harness as best I could. I cannot really read fuel trim data to see what they are doing (dont know what im looking at).
could someone give me some insight on what to check next?
Can a maf sensor tell pcm to throw codes for o2?
Here is some scanner data

 

The MAF code will not cause the O2 heater codes.

However, both the MAF and the two downstream O2 sensor heaters, along with a bunch of other stuff, all get power from fuse F32 under the dash. If the fuse was the problem, I'd expect a lot more fault codes. That said, it wouldn't hurt at all to pull that fuse and check its legs for corrosion and the female contacts for looseness.

 

I would concur with the suggestion to check fuse 32
However I also want to point out that the rear 02 sensors have nothing whatsoever to do with fuel trims. The front ones handle performance/fuel trim duties.

The rear sensors are only used for monitoring how well the catalytic converters are cleaning the exhaust.

 

He doesn't have any codes indicating any issue with fuel trims.

 

I know that, but the op was asking about fuel trims so I was just pointing out that the rear o2s don't have anything to do with that.

 

Thank you. I will check as soon as the sun comes up
Fuse is good

 

yes I have no apparent fuel issues. I was just hoping the trims might tell me what's going on. I'm stumped on this one. I'm afraid I may have to accept defeat and take it to a shop

 

The shots of your scan tool do not show anything of concern except the tool seems to think your vehicle has a third bank. Probably a mis-translation from the original Chinese.

Do check that fuse and its mounting.