New CEL p1131 and p1151

[batrup99jeremy]

I have been throwing CEL p0171 and p0174, in an attempt to solve this problem yesterday I cleanned up my intake and cleaned my idle air control, and checked and ziptied every vac line I could find. Today I'm driving home and it throws 3 CELs (p0171, p1131, p1151)
My SCT says p1131-"lack of ho2s-11 switches-sensor indicates lean b1,s1"
and p1151- "lack of ho2s-21 switches-sensor indicates lean b2,s1"

I did a search on here with no luck but in the how-to section they had the problem for these codes as
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

Has anybody else seen these codes? could it be that both my front o2 sensors went out? truck has 77k miles on it.

Thanks in advance for the help guys

[batrup99jeremy]

did some more reading online and found some people saying it the MAF. I have a SCT bigair MAF and its only about a year old, and when I took it off yesterday it didn't look dirty at all and there was no oil residue anywhere.
What cleaner is best to use on the MAF??

Thanks again

[Blind]

was your truck tuned for that MAF?

[UserName]

best cleaner is CRC Mass Air sensor cleaner, available at any parts store.

[batrup99jeremy]

was your truck tuned for that MAF?

Yes I bought the MAF from the tuner when I got the truck tuned.

[batrup99jeremy]

I cleared the codes on the 16th (day it happened) and the p1151 and p1131 have not came back on, but now I am back to square one with the p0171 and p0174 codes, I got the CRC cleaner and cleaned my MAF on Sunday and I still have the leans codes coming on. I sprayed all possible air leaks on the intake after the MAF with carb cleaner while the truck was idling and couldn't find any vac leaks..

Any ideas what I should check next???

Also is there a way to check if your o2 sensors are bad??

Thanks,
Jeremy

[bgstew6]

you have a vac leak....check all the connections...

[DATS TTRAH!]

I get the p0171 sometimes
Which connections shall i check first.

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[joedpl]

I look forward to when I replace my front O2's, I haven't changed them since I bought the truck with 86k, now it had 121k. I've already got them sitting in the garage luckily so I just gotta find the time.

[batrup99jeremy]

thanks for the help guys! I will be searching again for vac leaks tom.. hopefully with some luck this time.
These stupid codes are such a pain in the ***.

Also I have read on here about a PCV hose that connects somewhere on the back side of the motor, does anybody have a pic of where it is? I felt all around back there as much I as could reach atleast and everything seems good, but I want to be certain.

[batrup99jeremy]

recap. My truck throws the CEL codes p0131, and p0174 all the time.. Today I searched and searched for a vac leak, pretty much soaked my whole engine with carb cleaner before it was all said and done with no change in idle the entire time...
soo I called tousley ford today and order 2 new front o2 sensors for 44.XX each. After they come in we will see if there is any improvement.

[Thor]

Not sure of exact codes but after I cleaned my intercooler at 80K I needed new sensors and that solved my problem

[batrup99jeremy]

my next step is to clean my intercooler, hopefully i'll find time next week, and my o2s should be in on tuesday.

[Fred Flintstone]

I would check each one of my plugs to see if any have been damaged then post me back with what each plug looks like. May as well take this opportunity to change them.

[batrup99jeremy]

my o2 sensors came in today but they sent me the wrong ones, I called trousely ford and they got the right ones shipped out today. When they come in next week I'll check my plugs when i'm wrenchin changing the o2 sensors. My plugs only have about 15k miles on them, I have NGKTR6 plugs