This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. This code may be seen with other lean condition codes or misfire codes. The P code means that the system is too lean off idle for bank 1. What that tells us is that the air-fuel mixture is too lean for the bank 1 half of the engine.
The engine control module ECM constantly monitors the air-fuel ratio, and when it is found to be too lean off idle for bank 1, the Check Engine Light is set, which can be seen on the dashboard.
With the Check Engine Light, a failsafe mode is set. This failsafe mode is enabled to protect the engine from damage and sets a fixed air-fuel ratio to prevent the vehicle from becoming too rich or too lean.
The failsafe mode will remain on until normal operation is detected or the code is repaired. A wide array of causes can trigger the P code. With that, the symptoms can vary greatly depending on what is causing the code:.
A visual inspection is performed looking for broken components, damaged wiring, and tears in the intake boot. Mistakes are commonly made when all steps are not followed in the order they are listed or if steps are not completed at all.
The other source of mistakes is when components are replaced without being tested.How to fix the MAF Mass Air Flow Sensor on a Volkswagon Jetta
This leads to misdiagnosis and may not actually repair the vehicle, which wastes both time and money. How serious the P code is depends on the symptoms that are experienced. If no symptoms are noticed, then the code should not prevent the vehicle from being driven, but it should still be repaired as as soon as possible. In cases where the vehicle is stalling or badly misfiring, it should not be driven and the vehicle should be repaired immediately.
In some scenarios, a clogged fuel injector or low fuel pressure is present. This may be resolved with the use of fuel system cleaners.
P2177 - System Too Lean Off Idle Bank 1
These cleaners are added to the intake or gas tank and used to clean the varnish out of the fuel system. Before you replace the mass air flow sensor, know that it can be cleaned using mass air flow sensor cleaner. This is a specific cleaner that is the only cleaner that should be used on the MAF sensor. In some cases, cleaning the sensor will resolve the issue and not require replacement. 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 With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Cost of diagnosing the P code. No more waiting rooms! Our mechanics will come to you to diagnose and fix the P code.
Recent Check Engine Light is on Inspection reviews. Excellent Rating. Average Rating 4.The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal.
Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied.
The emptying process is called canister purge. If the change in pressure is outside of the calibration the DTC will set.
P Volkswagen code shows that location the body harness connector, located in and around the left hand kick panel area or inside the IP consult a shop manual for location. Water can leak into the connector from clogged sunroof drains, A-pillar leaks, or windshield or cowling leaks. All auto trouble codes with car brands. P U B C Example: P Volkswagen Trouble Repair : P Volkswagen code shows that location the body harness connector, located in and around the left hand kick panel area or inside the IP consult a shop manual for location.
Example: We recommend Torque Pro. Note that diesel engines run with excess air at idle, and are therefore not affected by this code. Note that on some applications, the code will be set as soon as the fault occurs while on others, the code will be set if the fault occurs over two or more start-up cycles.
The image below shows typical damage in an inlet boot caused by hardening of the boot. This type of damage is a major cause of vacuum leaks that lead to code P being set. Non-professional mechanics are therefore advised to read the relevant section Fuel and Air Metering in the manual for the application being worked on before attempting a diagnosis and repair of P, since some of the possible causes of this code as listed below may not appear to be relevant to the code, and may in fact not be relevant to this code on some applications.
In some cases, there may be no symptoms present other than a stored trouble code and an illuminated warning light. However, depending on the application and the exact nature of the problem, other symptoms could vary from slight and barely detectable, to severe enough to prevent the engine from idling at all.
Typical symptoms could include the following. Consult the manual for the application being worked on for detailed information on the possible long-term effects of not correcting all, or some code-setting conditions.
In many, if not most cases of code P on these applications, the problem can often be resolved, albeit temporarily by a simple cleaning of the MAF Mass Airflow sensor element with an approved solvent, since the excess oil in the inlet tract s of these applications can cause false, invalid, or erratic signal voltages to be generated.
Finding liquid oil in the inlet tract s of these applications is common, and while the cure for this condition is often very expensive, the only way to reduce the incidence of code P on these applications is to take all practicable measures to reduce the amount of oil that accumulates in the inlet tract.
WARNING: Due to the large number of possible causes and code setting parameters of code P, the information presented here is intended for general informational purposes only. NOTE 1: Diagnosing code P requires that the engine be in perfect running condition, with no exhaust leaks, vacuum leaks, or other codes being present. Assuming that the engine is known to be in good mechanical condition, record all fault codes present as well as all available freeze frame data.
This information can be of use both should an intermittent fault be diagnosed later on, and when several other codes are present, to assist in pinpointing some causes of P NOTE 1: There is little point in continuing the diagnosis of this code if the engine is not in good mechanical condition. Consult the manual for detailed information on how to identify, and replace defective PCV system components. Perform a thorough visual inspection of the engine vacuum system, and look for split, cracked, dislodged, or hardened vacuum hoses and lines.
Make repairs as required, clear all codes, and operate the vehicle for at least one drive cycle. Rescan the system to see if the code returns. NOTE: If no damaged or leaking vacuum lines are found but the code persists, suspect leaking inlet manifold gaskets.
Consult the manual on the correct procedure to replace inlet manifold gaskets. Rescan the system after the gasket replacement to see if the code returns.
While performing the vacuum system inspection, also inspect the MAF Mass Airflow sensor for evidence of oil contamination. Clean the element with an approved solvent, refit the sensor, but make sure there are no vacuum leaks at any connection in the inlet tract.We recommend Torque Pro. As a practical matter, the PCM uses input data from a variety of engine sensors to monitor the volume of air that enters the engine, with this value serving as the basis on which the fuel delivery strategy is calculated.
In addition, the PCM also uses input data from oxygen sensors whose function it is to measure the amount of oxygen in the exhaust stream as a function of the combustion process. In practice, the oxygen sensors are located on either side of the catalytic converter, with the upstream oxygen sensor providing the primary input data that ultimately controls the air fuel mixture.
However, to avoid large adaptations to the fuel injector pulse width which controls the amount of fuel being injectedthe PCM alternately switches the oxygen sensor to read rich and lean mixtures several times per second. The image above shows the location circled of the upstream oxygen sensor in the exhaust manifold on a Honda Civic application. Note however that while the upstream sensor is located similarly on many applications, there are many instances where the upstream oxygen sensor is located in the exhaust tubing closer to the catalytic converter under the vehicle.
In these cases, it is important to refer to the repair manual for the affected application to locate and identify the upstream oxygen sensor correctly, since there may be several other unrelated sensors located close to the catalytic converter as well.
Note that failure to identify the upstream oxygen sensor correctly could lead to a misdiagnosis and the unnecessary replacement of sensors, parts, and components.
If any such codes are present, these codes must be investigated and resolved in the order in which they were set and stored before an attempt is made to diagnose P Failure to do this could result in a misdiagnosis, and the unnecessary replacement of parts and components. This site uses Akismet to reduce spam. Learn how your comment data is processed. This code happens when using ethanol E To achieve correct combustion, more fuel needs to be injected.
The Long Term Fuel Trim raises above normal for normal fuel. Skip to content. Most reacted comment. Hottest comment thread. Recent comment authors. Notify of.A problem usually caused by issues in the fuel pressure, injectors, intake leak or faults in the wirings, short to positive, HO2S, or PCM.
This error code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system, especially those made since up to present. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. Error Code P means a problem with the Bank 1 being too lean off idle. This means that the air-fuel mixture is too lean for the Bank 1 half of the engine.
The PCM powertrain control module, also known as ECM or engine control module continuously keeps track of the air-fuel ratio and activates the Check Engine light when there is too lean off idle for Bank 1 condition.
This code also sets the vehicle on Failsafe Mode, which protects the engine from further damage and sets a fixed air-fuel ratio to keep the vehicle from becoming too lean or too rich. Failsafe mode will remain until the code is fixed and the engine gets back to normal operation.
Got codes? P2293, P053F, P2177, P0087
Symptoms for this error code can vary widely, depending on the cause of the problem. Symptoms include:.
To diagnose for this code, technicians use a scan tool to check for the stored code in the PCM. Then, takes note of all codes present and record the freeze frame data associated with the codes. The codes are then cleared for a fresh start. Next, the vehicle is taken for a test drive under conditions similar to when the code is set freeze frame data. The technician will then proceed in for visual inspection and look for broken components, damaged wires, and signs of wear and tear in the intake boot.
Next, they will use the scan tool to look for long-term fuel terms and compare Bank 1 to Bank 2. O2 sensor data will be observed and compared as well. The intake will then be checked for air leaks, while the MAF sensor will be tested for proper operation. Repairs for this code are pretty simple and straightforward, which of course still demands thorough diagnosis.
Some of the common repairs include:. The severity of this error code mostly depends on the nature cause and symptoms it exhibits. If there are no noticeable symptoms, then this code should not keep the vehicle from being driven. It should, however, still be addressed as soon as possible. In cases where the code exhibits misfire and stalling symptoms, the vehicle must NOT be driven and should be repaired immediately. In some cases, clogging in the fuel injector or low fuel pressure is what is causing the problem.Forums New posts Search forums.
Got codes? P, PF, P, P Thread starter JesGistang Start date Oct 31, JesGistang Passed Driver's Ed. So a couple days ago I noticed directly after startup, she idled very strangely, then dropped to normal idle and drove fine. Went to get gas. Started her back up, and the CEL came on. Luckily the scanner stays in the car. P System too lean Off Idle, Bank 1?
SO, if anyone experiences these same codes, there's your solution.
Keithuk Go Kart Champion. Power Loss. Fuel Pressure too Low. Intake Camshaft Failure. Check Fuel Pressure System for Leaks. Check Fuel Quantity supplied by the Fuel Pump. Special Notes: When found in 2.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.
P2177 Volkswagen System Too Lean Off Idle (Bank 1)
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. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition. Get Access to Factory Service Manuals. Need more help?
Get the P Volkswagen 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 Volkswagen code? Have you replaced any parts? Any information is appreciated. Repair Importance Level: 3.
Home - About AutoCodes. Posted and Edit by AutoCodes.