P0171, P0174, P2195, P92197 codes - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-08-2012
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P0171, P0174, P2195, P92197 codes

guys need help, a lot of help.

Recently I had some issues with my MAF sensor, which I cleaned with a carb cleaner and apparently I screwed it up and ended up damaging it.

I replaced it with a new one and always when I turn the engine on, the RPMs will go to 2000 or more and then slowly return to 1200-1000. What I did not like about this is that even if the truck had already ran for a while, every time I started it (cold or hot) it will climb to 2000 rpms.

Any way, I took the throttle assy, cleaned it and re-install it, all of a sudden, I start getting these codes, all telling me that the mixture is lean (too much oxygen, missing fuel).

I ran a the engine with the scanner and as I'm looking at the parameters, I see that both oxygen sensors aren't reading any voltage and the engine starts to sputter and wanting to die.

How can the Oxygen sensors (both) die at the same time just by replacing the MAF sensor?

It makes no sense, does anybody have a clue on what's going on?

I checked several other forums for these codes, and they all seam to lead back to the MAF sensor or the elbow connector for the PCV valve leaking, but honestly, there is no leaking that I can hear around the engine.

Please help out if anyone has an idea.

Thanks...
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Old 05-08-2012
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your throttle body isnt on tight. every code there can be attributed to leak after the MAF sensor. did you tighten the hose clamps on the intake tube? something isnt tight you also could be missing the gasket on the throttle body, or the evap hose isnt seated properly on the connector of the tube.
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Old 05-08-2012
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Check the air line that runs into the intake right behind the throttle body. They are prone to tearing underneath on the bend. Easy fix if it is the case.
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Old 05-08-2012
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I think I tightened everything back, previous to those codes I didn't had any code before.

I started having them just after I took the throttle off and back on.

but, would that cause the O2 sensors to not give any voltage at all?

As I was looking at the data stream, both sensors were reading 0 volts.

I'll check the hoses and if the T.B. is properly seated, I'll even put some light RTV on the mating surfaces as I put it back on.

I'll keep you all posted.

thanks...
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Old 05-16-2012
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Guys, I still have the problem, it's pissing me off to the point that I want to get rid of the truck....

I went trough the whole motor and cannot find the leak. I even took a hose and put one end in my ear and the other on every spot on the engine that I could think there could be a leak and there was no noise. I even sprayed the whole engine with carb cleaner in several spots and there was no change in RPMs.

I can't seem to find where the problem is.

Sometimes it drives perfect, then it will start bogging and it will start doing it right in a stop light (low RPMs), from there on it will bog and all of a sudden will start running fine again (WTF????)

Please help, don't know what else to do...
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Old 05-16-2012
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What codes do you still have?
all of them?
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Old 05-16-2012
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drop it off at ford and let them fix it. internet techs arent gonna get your truck running right.

my guess is this.

you sprayed the intake, could have gotten one of the sensors wet. you turned on the car and it made a short on the computer and fried it. if you maf is goo, your TPS is good, your IAC is good, your o2 sensors are good, theres no leaks, its very possible. 0 voltage is bad, but try replacing one and see. if theres no change im sorry but id call a computer has gone bad.

try removing your battery for a day. let the computer reset 100% then give that a go. otherwise, take her to a dealership and let an expert fix the problem. no point getting flustered over it
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