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Thread: Code: PO171 Bank One Lean
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
A code P0171 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure
P0171: System too lean (bank 1)
LoL, when me and the wife went to the east coast for a week, the rental car company wanted to give me a PT cruiser.. pretty much both of us reacted with a 'Hell No!' and demanded a different car.
Cobalt SS has ****ty suspension doesn't it? i saw the bottom of an N/A cobalt and it was like truck suspension...
Well anyways, I used some injector cleaner in the car (I know, I don't care) and now it doesn't stall, and idle is MUCH smoother. Every now and then, it will take a drop in RPMs and go back to normal, and drop to 450 when I let do of the accelerator. The car pulled all kind of codes, IAT low, IAT high, Evap purge, lean on bank 1, random misfire...
I put in a full tank of 94 with Tactrol (cleaning additive) from Petro-Canada, car still had trouble starting up, so I changed the gas cap. Didn't have to refuel the car yet, we'll see if it does anything when I go refill for the next time. I also plan on bringing the car to a specialized fuel injection shop and get the injectors cleaned.
All in all, car is much better, not perfect but at least driveable now. No codes yet, lean on bank 1 pending though.
2000 Ford Explorer XLT System Too Lean
Trouble Code P0171 and P0174 on your Ford Explorer indicates your Ford's engine is running lean in both Bank 1 and Bank 2. Bank 1 is the side of the engine where the number one (1) cylinder is located. The oxygen sensor on bank 1 has noticed the engine is running lean. Running "lean" means either inadequate fuel is getting to the combustion chambers, or too much "unmetered" air is being mixed in with the fuel. First you'll need to look into things which would cause unmetered air to enter the intake manifold, such as cracked or disconnected vacuum hoses. "Unmetered" means air which is getting to the combustion chambers without passing through the mass air flow sensor. Next you should inspect things which would cause inadequate fuel delivery such as emission sensors which may be reporting false values to the ECU (engine control computer). A good example of an emission component which could be defective and causing inadequate fuel delivery is the MAF (Mass Air Flow Sensor). A good example of a mechanical component would be a dirty fuel filter or weak fuel pump. There is always the possibility of the Bank 1 and Bank 2 Oxygen Sensors being defective and not sending out the correct fuel mixture voltage, however it is recommended to suspect a defective oxygen sensor after inspecting the vacuum lines and the MAF.
posted by SmogTips Support 10-28-2013 11:13 PM
There’s never a convenient time to get a trouble code on your car. Receiving them can be stressful and irritating. That wonderful car you love, has suddenly turned on you. So, if you’re lost as to what to do after getting the P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code, we may have the solution for you in this article!
Auto Repairs Are EXPENSIVE
What Does The P0171 System Too Lean Bank 1 Trouble Code Mean?
When you receive the P0171 code on your vehicle, it essentially means that the first bank of the engine is experiencing a fuel system that is not running full capacity of is running in weakened state. There may also be a vacuum leak near this particular side of the engine too. A lean condition happens when the engine receives either too much air or too little fuel.
What Are Some Of The Causes Of The P0171 Code?
Some of the causes of the P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code include:
- A bad or a faulty powertrain control module.
- A faulty or a deteriorating mass air flow sensor.
- A substandard fuel pressure regulator.
- Faulty or bad injectors(s).
- Bad oxygen sensor(s).
- A clogged fuel filter.
- Faulty fuel pump.
- A vacuum leak.
Symptoms Of The P0171 OBD-II Trouble Code: System Too Lean Bank 1
Check out some of the most common symptoms of the P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code:
- Damage of your catalytic converter- this could be the case if the trouble code is stored for a lengthy period of time.
- Your “check engine light” may illuminate on your dash.
- Stumbling or hesitation from your engine.
- Engine may be hard to start or die.
- A loss of power.
How Does A Mechanic Diagnose The P0171 OBD-II Trouble Code: System Too Lean Bank 1Code?
Let’s make the assumption that there are no other issues with your car, except the P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code. For a mechanic to properly diagnose the P0171, he or she may check your vehicle’s engine for any vacuum leaks by using a vacuum gauge. Your mechanic will also check the fuel pressure using a fuel pressure gauge tool as well. In an effort to keep a proper fuel/air ratio, the fuel pressure and the vacuum of the engine has to align with manufacturer’s specifications. The source of the P0171 trouble code will likely be revealed during one of these two evaluations your mechanic performs. But if the mechanic cannot find the cause of the code with either of these two tests, then chances are, there is an issue with a sensor. So, should this be the case, the mechanic will then would then run some tests with the oxygen sensors and the mass airflow sensor, according to the vehicle manufacturer’s specifications. But if all these tests have been performed, then your mechanic may decide that the source of the P0171 code may be the powertrain control module.
Is It OK To Drive With P0171 Code?
You can drive your vehicle with P0171 for a small period of time. But if you decide to ignore the code and continue to drive with the code, for a long period of time, then you run the risk of overheating your vehicle’s engine -which can cause lots of internal engine damage.
“So, The P0171 Code is Quite Serious, Correct?”
When you receive the P0171 code, you’re definitely dealing with a serious issue. If the vehicle is stored in the vehicle’s powertrain control module, then the engine of that vehicle is not going to run efficiently. Should your engine not maintain the proper fuel/air ratio, then there is a lack of power as well as a huge waste of fuel as you drive. Given these issues and conditions, it is a good idea to get this trouble code diagnosed and fixed as soon as possible.
“What Repairs Can I Make To My Car To Remedy This P0171 OBD-II Trouble Code: System Too Lean Bank 1 Trouble Code?”
There are certain fixes that can remedy the P0171 OBD-II Trouble Code: System Too Lean Bank 1 code. Let’s take a look at a few of them.
Fuel Pump Replacement
The remedy to fix your P0171 code my lie in the replacement of your fuel pump. The average cost to replace a fuel pump replacement can be between $750 and as much as $1,900. The exact cost does depend on the vehicle make, model and age.Click here to read more!
Fuel Filter Replacement
If you need to replace your fuel filter in order to get rid of that pesky P0171 code, then, you are looking at a repair that doesn’t cost too much. In fact, in comparison to other car fixes, you can plan on spending about $50 and $175 for a quality fuel filter replacement by your mechanic. Click here to learn more!
Fuel Pressure Regulator Replacement
A fuel pressure regulator isn’t a very well-known component of your car, but it is certainly vital to the operation of your vehicle. The fuel pressure regulator plays a very important role in ensuring that the fuel and air mixture system is maintained at a proper level. If you have a poor working fuel pressure regulator, then you will have a fuel pump that will push an excessive amount of fuel being pushed into the fuel injectors. Those fuel injectors will cause them to fail. The average cost of a fuel pressure regulator replacement is between $250 and $400. Click here to learn more!
Powertrain Control Module Replacement
Maybe the problem of your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code appearing, lies in the replacement of your powertrain control module. The powertrain control module generally goes by the abbreviation of PCM. Your PCM is the component that combines both the transmission control unit that has the task of managing your engine’s ignition system. Your PCM also manages and monitors the emission systems and the fuel injection. Did you know that your PCM also has to evaluate additional functions that are related to the vehicle’s transmission systems and engine systems too? The average cost to replace the PCM is between $500 and $1,500. Click here to learn more!
Injectors/Fuel Injector Replacement
Perhaps your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code is appearing because it is due to you needing to replace your fuel injector/injectors. Generally, a fuel injector replacement cost will between $800 and $1,450 for a full replacement. But if you are able to replace them yourself, then you can count on parts costing between $600 and $1200. Click here to learn more!
Oxygen Sensor Replacement Cost
Maybe in order to get your P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code to disappear, is to replace your oxygen sensor. Oxygen sensors are pretty new, regarding vehicle construction. The oxygen sensor arrived on the automotive scene in 1996. If you are experiencing oxygen sensor failure, then you are looking at a replacement cost between $250 and $500. Click here to learn more!
Replacement of Mass Air Flow Sensor
That troublesome P0171 OBD-II Trouble Code: System Too Lean Bank 1 trouble code may cease to exist if you replace your mass air flow sensor. Mass airflow sensors are typically utilized in fuel injected engines. A vehicle’s mass airflow sensor has the job of regulating the amount of air that enters into an automobile’s fuel injection engine. The mass air flow sensor also gives the data to the ECU or the engine control unit. The information that it provides is vital; as it allows the ECU to provide the correct volume of fuel to the vehicle’s engine. Click here to learn more!
Vacuum Leak Repair
In order to get rid of that P0171 OBD-II Trouble Code: System Too Lean Bank 1 code, you may need to get a vacuum leak fixed ASAP. Perhaps you have heard of a vacuum leak and you’re just not sure what that means. So, what exactly is a vacuum leak? This issue refers to the system that lies between the mass airflow system and the engine. Your mechanic has to determine where the leak is. So, depending where the leak is located, a vacuum leak repair can cost you anywhere between $150 and $1,000. Click here to learn more!
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