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2010 F150 4.6L 3V Failed Emissions, O2 and O2 Heated Not Ready

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2010 F150 4.6L 3V Failed Emissions, O2 and O2 Heated Not Ready

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Old 11-14-2017, 02:22 PM
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Default 2010 F150 4.6L 3V Failed Emissions, O2 and O2 Heated Not Ready

Hi all,

New to the forum. I have a 2010 F150 XLT with the 4.6L V8 (3-valve) with 112k miles.

I recently failed emissions test in Texas with 2 tests "not ready."
Both the O2 and O2 heated showed that.
All others, including EVAP and CAT were "ready."
EGR showed as "not available."
Most issues like this seemed to report a code and/or not pass one or more of the other tests.

I have never received a fault/DTC code, and still currently don't have one.

My mechanic told me the sensors are operating properly (from an engine-running standpoint).

Any tips on diagnosis?

I have also noticed the heat shield on top of the transmission is sagging and touching the O2 connector. I will try to see if that changes things, but in the mean time, does anyone know a part number or name for this heat shield?
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Old 11-14-2017, 02:39 PM
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When is the last time the battery was disconnected or power was lost on the truck? In general, having a not-ready indicator but without an actual check engine light just means not enough drive cycles have happened since everything was last reset.

Heat shield isn't going to make any difference. It is just making sure the wires and clips don't get too hot. They aren't melting, so it is doing its job.
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Old 11-14-2017, 02:49 PM
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The heat shield is wet. I'm dealing with the AC drain issue right now.

I've driven the truck for months since the battery was disconnected - I think it was in July.

Since then I've driven nearly every day, rush hour style as well as long distance highway.
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Old 12-01-2017, 04:49 PM
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I wanted to follow up on here with how I ended up passing inspection.

I did the three following things leading up to it:
  • Added Guaranteed To Pass - Emissions Test Formula to a tank, used it up, then went through another 100% gasoline tank
  • My mechanic told me he flashed my PCM, though when I started the truck, no monitors had been reset to "Not Ready," so I'm not sure if he actually did this, but I wanted to list it nonetheless
  • I zip-tied my O2 sensor connector away from the heat shield as it was touching it (see picture in above post)
After doing those things, and a recent trip to Austin (~400 miles roundtrip) I finally got all monitors to "Ready."

I can't say for certain exactly what did the trick, but my opinion is that the O2 connector was the problem.
My heat shield was damp due to the A/C system dripping onto it (a whole other issue). I think some electrical error happened as a result.

It may have been simply driving more miles, though I doubt it as I had previously driven well over 1000 miles with no success.

I also fixed my A/C drain issue per TSB 07-13-5 (http://ww2.justanswer.com/uploads/fo..._150727_A1.pdf). I noticed wet carpet on the passenger side floorboard coinciding with A/C usage.
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Old 03-23-2018, 08:51 PM
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i wanted to reply to this since i was have ing a similar issue with a 2010 f150 with a 5.4 3v.
in texas you can have one not ready monitor to pass inspection for 2000 yr model and later. i have a 10 ford f150 that would not complete a drive cycle with o2 sensor and o2 sensor heater ready. after clearing the p1000 code i tried 3 different times following the ford drive cycle procedure completely. cat would set , then evap, but not either o2 . on other ford vehicles usually the o2 heater and o2 sensor would set first. usually evap would be the last .

without inspection you cant get tags. this was very frustrating. i have been searching for several days trying to find a fix for this. finally i stumbled upon a fellow texan on another board that had the same issue and finally took his truck to ford. they told him a bad fpmd, fuel pump module driver, mounted above the spare tire, was the problem. my fpmd was not bad as my truck run s great. how could this be related??? i replaced this part with a known good one borrowed from another vehicle. both o2 sensors set at the same time within 10 minutes of driving. all monitors are ready and inspection is done.

thought i would pass this info on. thanks. mark
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