Johnny is a longtime online writer and car enthusiast who has expertise in fixing car problems. If your "check engine" light is on, and you've used an OBDII scanner tool to read the fault codes, and they returned P and P, this guide is for you. Here is a discussion of their meaning and their common causes. Basically because your engine fuel mixture has too much air and not enough fuel in it a lean mixture.
A mixture that isn't optimal may be called:. The Engine Control Module measures the amount of oxygen in the exhaust system via the oxygen sensors and makes adjustments by adding more or less fuel to the mixture. When the adjustments become too large to maintain the proper mixture, the fault codes P and P are logged. They are logged together, since in V8 and V6 and more rarely in some 4-cylinder and straight 6-cylinder cars the cylinders are split into two separate groups, or banks.
This is the most likely cause of too much air being taken into the system. The source of a vacuum leak could be one of many things, including but not limited to cracking, wear, or a hole in any of the following:.
If any of these parts are not forming a perfect seal have a slit in them then unmetered air will be entering the engine. Try to listen for a whistle or hiss under the hood with the engine running and visually inspect all hoses and connections. Example of cracks in an air intake boot causing P and P codes.
The MAF could be under reporting the amount of air passing through the intake. This seems rather unlikely but worth checking into all the same.
This is a case in which air flow is normal but not enough fuel is being delivered. Due to a possible loss of fuel pressure or flow the ECU cannot provide enough fuel to the attain the correct mixture. If the engine is a V8 or V6 and only one side or bank is reporting a fault code it could be a leaking intake manifold gasket or leaking manifold.
If you have logged both codes, however, it is unlikely that a leaking manifold would be the issue since both manifolds would have to be leaking. It's possible but highly unlikely that P and P codes are the result of faulty O2 sensors. If O2 sensors are causing both P and P banks to report a lean mixture, that would mean that both O2 sensors are misreading the amount of oxygen in the exhaust. Not a likely scenario. Also, the computer will run validation tests on the readings of the O2 sensors before looking at fuel trim adjustments.Scary sound download
Only then would a too-lean mixture be returned and logged as a fault P Be sure to search for other information about these codes that might be specific to your car make and model. There may be other very specific or common issues that other motorists have experienced with your car. Just Google the codes followed by your car's make and model, for example: "P and P Ford Expedition. Additionally, an economical solution that doesn't require a smartphone or dealing with wireless connecting is an all-in-one code reader.
Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.Play Now. Engine-Codes - Generic - P P Possible Causes What does this mean? How is the P code repair? Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Tech Notes What does this mean? What is the cost to diagnose the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city. How much do you know about cars? Take the AutoCodes.Windows 10 l2tp registry fix
When is the code detected? The mixture ratio is too lean. The Engine Control Module ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large The actual mixture ratio is too lean. More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals. Need more help?
Get the P code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON?
BMW P0171 Fuel Trim System Lean Bank 1
Repair Importance Level: 3.This page is for personal, non-commercial use. System Too Lean Bank 1. The P code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine.
A lean condition occurs when the engine either receives too little fuel or too much air. Assuming that no other trouble codes exist, a mechanic may diagnose the P code by checking the engine for vacuum leaks with a vacuum gauge and checking the fuel pressure with a fuel pressure gauge.
The cause of this trouble code will likely be discovered during one of these two tests. If the cause of this issue is still not found after the mechanic has performed these two tests, the problem likely lies with a sensor.
If all of these tests have been performed and no issues are found, the problem is likely the powertrain control module. A common mistake that could be made when diagnosing the P code would be not looking for any technical service bulletins for your specific car model that may be related to this issue.
Although every trouble code will not have a technical service bulletin associated with it, it is always wise to check as they can save you a world of time and effort.
The P code is a serious issue. If a vehicle has this code stored in its powertrain control module, the engine of that vehicle simply will not run well. It is a good idea to have this code diagnosed and repaired as soon as possible to have your vehicle running smoothly. It is unwise to drive a vehicle with this trouble code stored for a long period of time. If an engine runs improperly for a long period of time, further damage may result that could end up being much more costly to the owner of the vehicle.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at This article originally appeared on YourMechanic. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you. Get service at your home or office 7 days a week with fair and transparent pricing.
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Thanks for that. And thanks for reading Autoblog. Share 0 Comments. P code definition System Too Lean Bank 1 What the P code means The P code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine.
What are the causes of the P code? Causes of the P code may include: A faulty fuel pressure regulator A weak fuel pump A clogged fuel filter A faulty powertrain control module A vacuum leak Faulty injector s Faulty oxygen sensor s A faulty mass air flow sensor What are the symptoms of the P code?
Symptoms of the P code may include: Loss of power Check Engine Light Hesitation or stumble from the engine Engine may be difficult to start Engine may die Catalytic converter damage may result if this code is stored for a long period of time How does a mechanic diagnose the P code? Common mistakes when diagnosing the P code A common mistake that could be made when diagnosing the P code would be not looking for any technical service bulletins for your specific car model that may be related to this issue.
How serious is the P code? What repairs can fix the P code? Replacing the fuel pump Replacing the fuel filter Replacing the fuel pressure regulator Replacing the powertrain control module Replacing one or more injectors Replacing one or more oxygen sensors Replacing the mass air flow sensor Repairing a vacuum leak Additional comments regarding the P code It is unwise to drive a vehicle with this trouble code stored for a long period of time.
Need help with a P code? Looking for an OBD2 code reader to diagnose your check engine light?Play Now. Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors.
Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. How much do you know about cars?
Take the AutoCodes. Tech Notes What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. When is the code detected? The mixture ratio is too lean. The Engine Control Module ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large The actual mixture ratio is too lean. Get Access to Factory Service Manuals. Need more help? Get the P Bmw code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Comments Help us improve AutoCodes. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P Bmw code? Have you replaced any parts?
Any information is appreciated. Repair Importance Level: 3. Home - About AutoCodes. Posted and Edit by AutoCodes.There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor. Possible Solutions Possible solutions include:? In the vast majority of cases, simply cleaning the MAF sensor does the trick.
Inspect all vacuum and PCV hoses, replace if necessary? The list of automotive Makes at the right edge of the screen.
P0171 BMW - Mixture Control System Too Lean
Enter the 5 character trouble codes in the search box and submit the search. If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes. The information contained on this site is presented for informational purposes only. We are not responsible for any actions you take on your vehicle.
If you have any doubt as to repairs on your vehicle, please contact your technician. Search for: Search. What does this mean? Check for a dirty fuel filter and proper fuel pressure.
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