Hello, I'm new here. I was hoping to get some help with these OBD codes. I preformed a scan this morning and these two codes showed up on the scanner; P0054 and P2270. I have a 2008, F-150 XL 4.2L V6.

I Googled each code:

Code P0054=
Faulty Heated Oxygen Sensor Bank 1 Sensor 2

Code P2270=
O2 Sensor Signal Stuck Lean Bank 1 Sensor 2

So, from this I gathered that I have an HO2 Sensor problem.

I went and took a look under the truck to see what my catalyst and HO2 Sensor setup looks like and it looks like this exactly:


I have an ALLDATADIY subscription, so that's where I got that diagram from. What's got me a little confused is ALLDATA's terminology, because looking at the ALLDATA diagram for my truck, the passenger's side (Bank 1) Sensor 2 (downstream) seems to be the sensor screwed directly into the catalytic converter. In the ALLDATA diagram though, those are referred to as "Catalyst monitor sensors" not HO2 sensors.

I looked in front of and behind both driver's side and passenger's side cats and these are the only sensors I would consider HO2 Sensors.

I got a good look at the so-called "Catalyst monitor sensors" and its electrical harness connector is light violet purple in color. They match Motorcraft part# 4L3Z9G444AA, DY992 perfectly in look:


Anyway, anyone with O2 sensor knowledge on the late model F-150s would be much appreciated. I'd just like to confirm that the Catalyst monitor sensors are indeed just another name for the downstream HO2 Sensors. I expected the HO2 Sensors to be post catalyst, not screwed into a bung in the actual cats, so that's what has me a little confused. Thanks

 

Alright, so I found my Haynes repair manual for 2004 thru 2009 F-150s. On page 6-19 it states:

So that answers that, ALLDATA's diagram refers to the downstream O2 sensors on my model at least as "Catalyst monitor sensors" but they are one in the same. I suspected as much as O2 sensors all look the same. Anyway, I hope this helps someone else if they happen to be as thick as me.

 

I had the same problem Thanks for the info