2004 - 2008 F-150

P0054 and P2270 OBD codes

Old 07-26-2015, 09:55 PM
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P0054 and P2270 OBD codes

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

Last edited by Nunyanunya; 07-27-2015 at 01:14 PM.
Old 07-27-2015, 01:12 PM
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Alright, so I found my Haynes repair manual for 2004 thru 2009 F-150s. On page 6-19 it states:

There are two downstream oxygen sensors on all models. On 4.2L V6 models, the downstream sensors are located on the catalytic converters.
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.

Last edited by Nunyanunya; 07-28-2015 at 02:31 AM.
Old 09-10-2018, 09:14 AM
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I had the same problem Thanks for the info

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