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2000 ford f-150 lightning svt I have system to lean on both banks p0174 and p0171 where do i go from here ??

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  • Ford Master
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Hi.

P0174 and P0171 mean that there is too much air in the fuel/air mixture injected into cylinders.
You get the two codes for the two banks of cylinders as soon as the problem is detected through the O2 sensors.

There are many cause that can trigger this two codes, the possible reason can be better found observing any other symptom.

If the truck drives regularly, but you get the codes, then check the MAF sensor. The MAF determines the amount of air getting into the intake. MAF malfunctions can easily trigger lean codes.
If the MAF is dirty, try cleaning it, otherwise replace it.

If there are idle problems, check AIT (air intake temperature), and IAC (idle air control) valve. Both parts influence amount of air to be mixed when idling.

If the car is revving erratically or shutting down, check EGR valve. The EGR valve opens and close to use recirculated gas in the mixture EGR malfunctions will cause a number of problem, and often a lean code.
The DPFE sensor connected to the EGR valve may also cause the problem.

Under all conditions, check the vacuum system for leaks. A vacuum leak willl allow more air into the mixture returning a lean code.
The vacuum is tested using a hand gauge in the vacuum lines while heating lines at same time. Big leaks can be spotted because of hissing noise.
See: Actron Vacuum Gauge, Fuel Tester - 2179

In some occasion a faulty fuel pump or a clogged fuel line can prevent gas from being mixed to air, causing the lean code. Fuel circulation is tested with same tool used on vacuum.

I think I listed the most common reasons for a lean code. Start from vacuum and fuel, and if they are OK try replacing the MAF. This are very common faults that may store a lean code in the PCM memory.

Regards.

Ginko.


Posted on Jun 03, 2010

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I would like to know what these codes mean


P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0301 Cylinder #1 Misfire Detected
P0302 Cylinder #2 Misfire Detected
P0304 Cylinder #4 Misfire Detected
P0306 Cylinder #6 Misfire Detected

Mar 12, 2014 | 1999 Ford Explorer

1 Answer

2000 Ford F 150 Lightning. 5.4 supercharged. Keep


code p0171 refers to system too lean bank 1===causes --intake/ exhaust leak. AIR system---MAF?VAF sensor--fuel pressure/pump--injectors. HO2S
code po174 refers to system too lean bank 2===causes -intake/exhaust leak--fuel pressure /pump--injectors--AIR system---hose connection/s. You have ruled out the fuel pressure and pump so eliminate that from the causes. You have checked the o2 sensors so they can be ruled out. The MAF has been checked so rule that out. You are left with the AIR sensor and VAF sensor. and last the intake/ exhaust leaks. Check the gaskets on the exhaust manifold and the bolts are tight. Check for cracks in the manifold underneath. Check the cat converter for correct operation as that will affect the O2 sensor readings. Lastly if you have replaced any sensors with non genuine items they may be affecting the cpu checking processes and affecting the engine settings for economy. Ford and GMC have a mixture of OB2 and their OEM computer readings so you may have to talk with a ford service department to get that answer for 21

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1 Answer

My 2005 mustang GT was scanned and the following codes came back: P0171 AND P0174. What does these mean


P0171 Means system is to lean on bank #1. P0174 Means system to lean on bank #2.

Dec 14, 2010 | 2005 Ford Mustang

1 Answer

P171 and p174 codes for ford


are the codes p0171 and p0174? p0171 system too lean (bank #1) p0174 system to low ( bank # 2) o2 sensors will go in pairs.

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P0313 - Misfire Detected with Low Fuel
P0174 -System too Lean (Bank 2).
P0171 -System too Lean (Bank 1).

P0171 and P0174 mean "system too lean" for banks 1

Aug 24, 2010 | 2000 BMW 3 Series

1 Answer

What is the code P1451 solution? Runs great, codes P1451, P0171 and P0174 are coming up and the engine light is on. Car needs to get inspected but codes need to be fixed.


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I'm afraid I don't have enough info to tell you how to fix the P1451 but I'm certain it's the cause of the other two codes.

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What do these trouble codes mean p0171 and p0174


po171 is system too lean,bank 1,po174,is system too lean,bank 2,It sounds like a fuel pressure problem.

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P1507 P0171 & P0174 error codes on 02 windstar


p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks

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Diagonostic trouble codes reported p0171 p0174 p0302 2001 Taurus, only reports P0171


P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.

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