P0174 (system too lean bank 2) - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-28-2009
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Icon5 P0174 (system too lean bank 2)

Hey everyone,

This is my second post on this topic, but instead of figuring out what was going on with my Check Engine - I got the code and need some answers.

First off: 2005 Edge w/ K&N Cold Air Intake

The issue I have is that every 2 or 3 days the code will set, assuming its the Cold Air, so I plug in my OBD II Sensor and I get P0174 (system too lean bank 2) code. Some vitals from the freeze data that I have collected are (2000 - 3000 rpm, usually between 20 - 50 km/h, and ranging from 38g/s - 44g/s of oxygen) when it sets.

I've looked this problem over and over the internet, but no answer seems to solve my issue. The filter is not over oiled and I have used MAF cleaner to rid of any excess oil that may have be collected, but still the code continues. I have also check for leaks after the MAF sensor in case unmeasured air is entering the manifold, screwing up my air/fuel ratio.

I've contacted an old friend and he says that K&N has admitted that some of their kits might sent off codes. So he suggested putting on a new filter (non-K&N) on the tip of the Intake Tube as a test. So far out of 6 days, it has set off once, but I'm baby'ing it. In other words, its still not a full fix.

All-in-all I would just like to know if any of you have encountered this issue and what did you do to fix it. Also, I have heard that tuning the vehicle will adjust the ratio thus eliminating the code, is this true? Also, how much 'damage' can this be causing to the engine itself - the running of the code once in awhile?

Thanks for you time, much appreciated!

Kevin
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Old 07-28-2009
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Ok well i can't seem to find the thread but if you look under the hood pull the radiator hose up and look for the "L" Shaped pipe here is a pic of it not the greatest but its all i got. See if the tube has a hole in it mine did or just turn the engine on and see if the tube is sucking its self flat
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Old 07-28-2009
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Ok, i understand the part u mean, picture is ok. What do I do to the L shaped Pipe once located?
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Old 07-29-2009
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never mind..the image over lapped the last part of your response lol..refreshed and it reset itself so Icould see..haha. Ill check that out tomorrow and post a response.

Thnx
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Old 07-29-2009
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It is a vacuum leak, the code only trips when the amount of air registered coming in by the MAF, does not match what the oxygen sensors are picking up.

The freeze frame data from this code is pretty useless. As when you clear the code, it takes about 30 minutes of driving for all readiness monitors to re-activate, which it will then pick up the code.

Since it is only bank 2 (Passenger side), you can rule out your intake and filter itself as being the culprit. It is something specifically on the passenger side.

As already mentioned, the PCV valve hose is pretty common culprit as the oil vapor attacks the rubber and weakens it over time, especially in the bends.
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Old 07-30-2009
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Checked the PCV valve hose..totally forgetting that I replaced mine with a Silicone tubing. There is no wear on the tube whatsoever. Any other ideas?
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Old 07-30-2009
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take some MAF cleaner to the MAF sensor?
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Old 07-30-2009
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Already have done that
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Old 07-30-2009
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get a shotgun lol?
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Old 07-31-2009
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Typically the idle is unstable when this code is present, because the AFR is off. If so, take a bottle of soapy water or a can of carb/choke/TB cleaner and carefully and slowly spray your vacuum lines, as well as your intake manifold. If idle surges/drops, then you have found your culprit.

I cannot verify this for certain, as the only vehicles with cracked exhaust manifolds I've had were pre-OBD, but run some Seafoam through your intake and see if you see any smoke leaking from your exhaust manifolds. Its a wild guess, but there may be a slight possibility the extra air is being drawn through a cracked exhaust manifold or pinched exhaust manifold gasket.
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Old 07-31-2009
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i would spray around that PCV line, there are two rubber elbows on it, one at the front and one at the back. also spray around the passenger side intake gaskets
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Old 07-31-2009
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Ok Ill take a look at those problems tomorrow or Sunday, even the shotgun idea lol. In the mean time, if the code isn't on (hasn't been on all week *cheer*) Am I causing any harm to the engine? Ill post what happens with these new assumptions ASAP.

Thnx!
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