I'm getting error codes

P0171- System to Lean (bank 1)

P0174- System to Lean (bank 2)

P2195 -02 sensor signal stuck lean bank 1 sens 1

P1000

Can somebody explain with this means and what I need to do to fix it?

Thank you!

2004 F150 5.4L

 

either your engine is getting to much air or not enough fuel....do you have an aftermarket intake? when was the last ime you changed the fuel filter? how many miles on your truck? need more info..

 

It has 58,000 miles on it. I have a KN air filter that I just cleaned about a month ago. I haven't changed the fuel filter on it yet. Was running fine then I didn't drive it for a week and now it is idling very ruff and has stalled a couple times at red lights.

 

hate to say it but if you have 58,000 miles on your truck and have not changed the fuel filter yet your probably going to need a fuel pump :o

 

Did you over oil the filter element? If you did there's oil you used on the MAF sensor. Get some electronic cleaner(it doesn't leave an oilly residue)and spray down the sensor. Don't touch it either.

 

I will try cleaning it first. Have not driven it very much since cleaning it so hopefully that is all it is. Thanks!!!

 

I disagree, I ran 80,000 miles (like a dumba$$) before I changed the filter.
My fuel pump is fine.
Just swap the filter, clean the MAF and check your vacuum lines, especially the elbow located at THE BACK of the throttle body. This is a common cause of the lean codes as the boot will burn a hole in the elbow.

 

well im not sure where you get your fuel but keep going there then i have replaced pumps due to plugged filters with only 20,000 miles on them before....

 

I have replaced fuel pumps on alot of vehicles, with less mileage than that even. It doesn't mean anything but a defective fuel pump or installer error (or your driving a G.M.).

Anyway, it makes no sense to jump to conclusions on anything, it couldn't hurt to change the filter though, but I wouldn't replace the pump just yet. It could even be a defective O2 sensor, but I wouldn't replace it yet. Always start with the basics first. I would get rid of the K&N and clean your M.A.F. sensor and look for vacuum leaks before condemning anything. It may be necessary for you to take it to a professional Tech, but if you prefer, I'm sure you can figure it out with the help of some of these guys on this site. Good luck.

 

The stock intake system is better on that model anyway - K&N oiled filters suck - I dealt with MAF problems for a few years before I dumped that filter. I would just very very light oil it and the MAF would get F'ed up eventually.

Got tired of cleaning the MAF weekly and spending extra money for gas when the didn't cipher right.

 

I feel bad for you, that's for sure. 0171/0174 lean codes can have multiple causes.
1st, dump the K&N like somebody already stated.
Oil attracts dirt, which will collect on your MAF Sensor. Clean the sensor with a good electonics cleaner.
This sensor is located in the air tunnel right after the air filter housing. DO NOT us cotton swabs or anything else, the wires are very thin. Use the ext. straw that comes with the can of cleaner and just spray it really well. Do not use
high pressure air to clean the sensor off. (again, very thin wires) Further upstream in the flex tunnel, (before the 90 elbow to the throttle body) will be another sensor, (air intake temp). No need to clean it, can if you want.
You can buy MAF Sensor Cleaner if you want.

2nd, check all of your vacumm lines for a leak. Replace if necessary. The Ford V8's have a known problem with the 90 degree rubber boot that connects from the PCV line to the rear of the Throttle Body.
Ford sells the rubber connector (boot) for about $13.00. Someone on this site actually put a picture of the boot with the Ford Package and part number in one of these threads. (That guy is awesome, so is this site actually)

3rd, Without having a manual handy right now, I can't tell you which O2 sensor is bad according to the code. This sensor can also contribute to the lean code.
I did all of the vacuum line checks and cleaned off the MAF and cleared my codes. 50 miles later, CEL comes back on, outputting only the P0174 code.
I cleared Bank 1 up but Bank 2 still didn't like something. I climbed under the truck and found that the downstream O2 sensor was only threaded in 1/2 way. Loose enough, that I could wiggle it around and backed it out by hand.
Cleaned up the sensor, applied copper anti-seize and wrenched it back in.
Cleared the code and I have been fine for 2 weeks now. This was a replacement O2 sensor (Bosch) from the prior owner as I found out later. Bad install for sure. A friend/mechanic of mine thinks that with the sensor being loose like it was, that it is very possible to draw outside air, in thru the threads and have that sensor read wrong and possibly sense a lean condition by having excess Oxygen go by the sensor. Makes sense, and my code cleared and no more CEL.
4th, change your fuel filter now and on a regualr basis.
Before you put a new fuel pump in, STOP, check your fuel pressure on the fuel rail, (after you replace the filter of course). There will be a fitting to connect to for a fuel pressure gauge.

Do the above, and if you still can't clear the codes, there are more things you can check and / or repair. I'll keep an eye on this thread and offer more checks if you need them.

Good Luck, MIL / CEL Codes Suck

 

That is always a good idea...check fuel pressure before going to the hassle of replacing the fuel pump. But, some like to help the economy in their own certain way.

Otherwise, we all sigh as if someone replaced O2's because of a P0171/P0174 code.

I will give Ford this much; they are usually pretty consistent on the common lean code causes. Intake mani gaskets and that lousy PCV elbow/hose.

That P2195 could definitely be bad install or a cut harness. Check it! Or test is for proper values to make sure it indeed needs replacing.

The P1000...stop resetting the computer. The monitors are not ready. Simple enough.

 

Sh^t ! He has a 3 valve - SRY - I just noticed. The PCM's are picky in those models. I bet it hates your intake mod.

I would do exactly what has been posted - Clean the MAF .

Disconnect the battery before you do this. I would disconnect both sides instead of just the neg and when your re connect after you done ; Connect the Positive side first, then the Negative side.

Reinstall the factory intake. Connect the battery ; THEN see what you got. I bet everything is good, but if you get lean codes again. You have to find the leak. But put ALL of the factory intake components back on the truck.

 

What I did was modify my air box by opening holes into the element area. I also changed from a K&N element to one from Amsoil. Cheaper and better. Cleaned the MAF and no difference so it's not getting oil on it.

 

The bank 1 / O2 sense 1, is the O2 sensor on the passanger side of the engine. (Passanger side because the #1 piston cylinder is located on that side). Someone stated that you may have a connector or harness problem on that sensor. He is correct. Go to your local Auto parts store and purchase an aftermarket manual for $20.00. This will help you with the voltage and ohm readings you should have when testing it.
The Bank 1 / Sensor 1 / O2 , is the O2 sensor that is prior to your cat. converter. This is the one you want to be checking.
The manuals and the dealer techs will tell you, never to clean off an O2 sensor. I have and it works fine afterwards, just be gentle and use non-flammable, non solvent cleaners when cleaning it. This will not correct your voltage problem however.

I think I missed something, did you change to an aftermarket intake ?
If so, put the factory intake back on like others suggested.

Good Luck,
Keep us posted.