P0171 codigo

The P0171 code in a Toyota vehicle signifies that the fuel system is running too lean, meaning there is too much air or not enough fuel in the system. This condition is specifically detected in Bank 1, and it will display the following message on the scan reader: Fuel Trim System Too Lean (bank 1). This causes a number of symptoms, such as: In ...

Sep 10, 2018 · The P0171 code is thrown when the bank one sensor one O2 sensor reports that your Expedition’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap Test. Síntomas del código OBD2 P0171 Honda. Los signos de un código de falla P0171 Honda generalmente son: Sistema de inyección de combustible demasiado pobre en el banco 1. Luz de fallo de motor (Check Engine) encendida. Consumo excesivo de combustible. Pérdida de potencia en el motor. To diagnose the P0171 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour. The most common repairs needed to fix the P0171 engine code are as follows: 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. The P0171 code in Nissan vehicles indicates a problem with the fuel system, specifically a lean condition in bank 1. This means that there is an imbalance between the amount of fuel and air entering the engine, resulting in a fuel mixture that is too lean. This can lead to various issues such as reduced power, increased emissions, and potential ... Descripción y causas del código de avería P0171 de Peugeot. Consulta la descripción y solución de códigos de averías de diagnóstico OBDII usados por los mecánicos.

=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈===== How to Fix P0171 =====Engine Code P0171 Saving Repair...The past several months have caused many of us to take a long, critical look around our homes, and in some cases, we’ve found our living space wanting. To be fair, most of us didn’...Tech Notes. If the P0171 is combined with the P0174 code, it's highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists, the A/F Sensor (Sensor 1) may need to be replaced.Tech Notes. If the P0171 is combined with the P0174 code, the problem is likely caused by an intake leak or the Intake Plenum Gasket and seals. If there are no intake leaks, the next step is to replace the air filter and clean the airflow meter. If the problem persists, the front oxygen (O2) sensor may need to be replaced.The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor.One of the most common trouble codes with the Nissan Frontier is P0174. It indicates that your Nissan Frontier is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list ofTo diagnose the P0171 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

Limpieza del sensor de oxígeno: La falla P0171 en Jeep puede ser causada por un sensor de oxígeno sucio o dañado. Limpiar o reemplazar el sensor puede solucionar el problema. Revisión de la presión de combustible: Verificar que la presión de combustible esté dentro de los rangos adecuados. Si la presión es baja, puede causar una mezcla ... Síntomas del código OBD2 P0171 Nissan. Los síntomas evidentes de un código P0171 Nissan generalmente son: Sistema de inyección de combustible demasiado pobre en el banco 1. Luz de fallo de motor (Check Engine) encendida. Consumo excesivo de combustible. Pérdida de potencia en el motor. Marcha irregular o inestable. Ringing phones. Pinging e-mail. Co-workers’ ringing phones and pinging e-mail. How is anyone supposed to get work done in this place? A huge new study of “open-plan offices” finds ...So thought that the 2nd Oxygen sensor might went off and replaced it with the cheapest one paying around 25 EUR + postage. After that getting ...Cuando aparece el código P0171 Nissan en el tablero de tu auto debes poder saber de qué se trata. Aquí te explicaremos con qué fallo se relaciona este número, cuáles son sus causas y cómo puede proceder para darle solución. ÍNDICE DE CONTENIDOS. Descripción código P0171 Nissan; Los síntomas de un código de avería P0171 Toyota pueden ser: Se enciende la luz de fallo de motor (Check Engine) Consumo excesivo de combustible; Pérdida de potencia del motor; Marcha irregular del motor; Causas del código DTC P0171 Toyota. Puede haber varias causas para la aparición de un código DTC P0171 Toyota en un vehículo de motor ...

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El código P0171 es activado por el primer sensor de oxígeno (O2), ubicado aguas abajo del motor. Este sensor mide la relación aire-combustible de los gases que salen de los cilindros y envía esta información al módulo de control del tren motriz o del motor (PCM/ECM). El PCM/ECM ajusta la mezcla para mantener una relación óptima de 14,7:1.“I’m sure to the outside world it seems like, ‘Oh my god, gays in danger here,’ but we will carry on as we always have." At an international conference on Black portraiture, imager...Watch this video to see how to a step drill bit can drill a dozen different size holes in thin stock using only a single drill bit and how to control depth. Expert Advice On Improv...Si has encontrado el código de falla P0171 en tu vehículo Toyota, es crucial tomar medidas inmediatas para evitar mayores daños. El mantenimiento regular y las inspecciones son clave para evitar este problema por completo. Aquí tienes algunas medidas que puedes tomar para evitar que aparezca el código de falla P0171:So thought that the 2nd Oxygen sensor might went off and replaced it with the cheapest one paying around 25 EUR + postage. After that getting ...

La solución para el código de avería P0171 depende de la causa subyacente del problema. A continuación se presentan algunas soluciones comunes para el código de avería P0171: Reemplazo del filtro de aire: Si se determina que el filtro de aire está sucio, la solución más común es cambiar el filtro de aire. Esto es una solución simple ... Jul 4, 2017 ... It sounds more like a sensor issue than a computer issue. The computer is just responding to what the sensors send. Technicality I know but ...A continuación, podrás ver algunas soluciones y pasos a seguir para poder solucionar el código de falla P0171: Limpieza del sensor de oxígeno: La acumulación de suciedad en el sensor de oxígeno puede afectar su funcionamiento y causar una lectura incorrecta de la mezcla de combustible. Limpiar el sensor puede ayudar a corregir la falla P0171.Oftentimes, a P0171 means that your Toyota is having trouble with a dirty or faulty mass airflow (MAF) sensor, or a vacuum leak downstream of the MAF sensor (perhaps in the PCV line or in the valve itself). Of course, this code can also signify a bad O2 sensor in bank 1. Additionally, it's rare (but still possible) that a P0171 code can be ...A blockchain project called Safe has grown over the past year to become one of the biggest institutional-grade wallets for managing digital assets... A blockchain project called Sa...The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the …The P0171 code is thrown when the bank one sensor one O2 sensor reports that your CX-5’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap TestWith your Bluetooth scanner, monitor the O2 sensors. They should be oscillating. If it remains flat, then the O2 sensor is bad. It would be a good idea to change both O2 sensors. For the misfire, swap coil pack from cylinder 4 with 1 of the other 3. If the misfire goes to cylinder 4, then your coils are failing.Fuel Injectors. P0171 indicates that your Honda Accord is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0171. Pueden existir diversas razones por las que se detecta un código DTC P0171 Volkswagen en un coche. Algunas causas pueden incluir: Fugas de aire de admisión. Sensores de oxígeno delanteros defectuosos. Fallo en la ignición. Inyectores de combustible defectuosos. Fugas de gases de escape. Presión de combustible incorrecta. The p0171 is an engine code that can be obtained by scanning using an ODBII scanner. It is not necessarily exclusive to the Ford F150 truck and sees use in other models and vehicles. This code represents a problem in the exhaust system and can be connected to the . The location of this problem usually stems from the fuel trim system bank.

Codigo P0171 Causa Sintoma y Solucion. Como arreglar falla p0171 System Too Lean en Chevy o Cadillac 2.0l. Como cambiar manguera de pcv en un chevy o cadilla...

El código de diagnóstico P0171 en un Toyota Corolla 2005 se refiere a un problema en el sistema de inyección de combustible. Con el Control de Autoaprendizaje de la Relación Aire/Combustible, la relación real de mezcla puede acercarse a la relación teórica de mezcla basada en la señal de retroalimentación de la relación de mezcla de ...Nov 2, 2020 ... You could be getting the lean code from a vacuum leak, PCV issue, etc. IF it is in fact the o2 sensor, which it may very well be, then yes, ...The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor.The P0171 code in a Toyota vehicle signifies that the fuel system is running too lean, meaning there is too much air or not enough fuel in the system. This condition is specifically detected in Bank 1, and it will display the following message on the scan reader: Fuel Trim System Too Lean (bank 1). This causes a number of symptoms, such as: In ...Se debe de tener en cuenta que el código de diagnóstico OBD2 P0171 es un código genérico, por lo que este código DTC puede ser provocado en cualquier automóvil independientemente de que sea un vehículo de la marca Toyota o de cualquier otra marca.Advertisement For many people, filing state income taxes is a simple process. However, for some, it can be much more complicated. The state income tax system has some unusual excep...El código de diagnóstico P0171 nos indica principalmente que se ha identificado una condición muy baja en el sensor de oxígeno en el banco 1, lo que … Puede haber varias causas para la aparición de un código DTC P0171 Subaru en un auto. Puede haber varias causas, como: Fugas de aire de admisión. Sensores de oxígeno delanteros defectuosos. Fallo en la ignición. Inyectores de combustible defectuosos. Fugas de gases de escape. Presión de combustible incorrecta.

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El código de diagnóstico P0171 de Dodge se refiere a un problema en el sistema de inyección de combustible del vehículo. Este código indica que la relación aire/combustible real es demasiado pobre en comparación con la relación teórica deseada. Con el Control de Autoaprendizaje de la Relación Aire/Combustible, la relación de mezcla ... El código OBD2 P0171 indica que hay una mezcla demasiado pobre entre el aire y el combustible en un vehículo. Las posibles causas incluyen fugas en la admisión, problemas en el sistema de inyección de combustible, presión de combustible inadecuada, fallos en el sensor de oxígeno y más. Los síntomas incluyen el encendido del testigo ... Causes. Common Fixes. Questions. P0171 Definition: Fuel Trim System Lean Bank 1. P0171 is a generic code, meaning it has the same definition for the Dodge …To diagnose the P0171 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.The P0171 diagnostic trouble code indicates the vehicle's computer or Engine Control Module (ECM) has picked up too little fuel or too much air in the system. …Limpieza del sensor de oxígeno: La falla P0171 en un Chevrolet puede ser causada por un sensor de oxígeno sucio o contaminado. Limpiar o reemplazar el sensor puede solucionar el problema. Revisión de las conexiones del sensor de oxígeno: Verificar que las conexiones del sensor de oxígeno estén bien ajustadas y sin daños. Una vez que cambies la válvula será necesario borrar la falla de la computadora, para que el testigo de CHECK ENGINE se elimine de tu tablero, para esto lo puedes hacer mediante un escáner o simplemente desconectando por 20 minutos la batería de tu auto. Cómo arreglar el codigo P0171 en Chevrolet Sonic, este es un fallo comun de la valvula ... Se debe de tener en cuenta que el código de diagnóstico OBD2 P0171 es un código genérico, por lo que este código DTC puede ser provocado en cualquier automóvil independientemente de que sea un vehículo de la marca Mazda o de cualquier otra marca.It indicates that your Chevy Cruze is running lean on the bank one side. It’s the most common air/fuel mixture-related code. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common codes. The most common causes of P0171 are the purge valve or a vacuum leak. Definition. P0171: Fuel Trim System Lean ... P0171: Este código indica una condición de combustible demasiado pobre en el banco 1 del motor, lo que significa que el sensor de oxígeno ha detectado una cantidad insuficiente de combustible en la mezcla. Las posibles causas pueden ser similares a las del código P0174, como fugas de vacío, inyectores tapados o contaminados, entre otros. Life's a beach. Check out these other awesome beaches around the world! Life's a beach. Check out these other awesome beaches around the world! Join our newsletter for exclusive fe... ….

Watch this video to see how to a step drill bit can drill a dozen different size holes in thin stock using only a single drill bit and how to control depth. Expert Advice On Improv...The onboard computer is receiving information that the Air/Fuel ratio on Bank 1 of the engine is faulty. The P0171 trouble code in a Honda Accord indicates a lean condition in the engine. It means that the air-fuel mixture in the engine is imbalanced, with too much air and insufficient fuel. This imbalance can lead to poor engine performance ...Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. Limpieza del sensor de oxígeno: La falla P0171 en un Chevrolet puede ser causada por un sensor de oxígeno sucio o contaminado. Limpiar o reemplazar el sensor puede solucionar el problema. Revisión de las conexiones del sensor de oxígeno: Verificar que las conexiones del sensor de oxígeno estén bien ajustadas y sin daños. A continuación, podrás ver algunas soluciones y pasos a seguir para poder solucionar el código de falla P0171: Limpieza del sensor de oxígeno: La acumulación de suciedad en el sensor de oxígeno puede afectar su funcionamiento y causar una lectura incorrecta de la mezcla de combustible. Limpiar el sensor puede ayudar a corregir la falla P0171.Oct 1, 2018 · The P0171 code is thrown when the bank one sensor one O2 sensor reports that your Grand Cherokee’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap Test When the inevitable happens, your vehicle is going to store code P0171 – System Too Lean Bank 1. A P0171 can often pop up with a P0174 (System Too Lean Bank 2). Ideally, the stoichiometric ratio for your fuel system is 14.7 parts air to one part fuel, which provides a balanced mixture of fuel economy, performance and lower emissions during ...Description P0171 este codigo casi siempre es causado por un problema de vacio. STFT antes era 25% despues de arreglar el vacio cambio a negative 1.6%To diagnose the P0171 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour. P0171 codigo, The P0171 diagnostic trouble code indicates the vehicle's computer or Engine Control Module (ECM) has picked up too little fuel or too much air in the system. …, Some common causes of the P0171 code may include: A faulty fuel pressure regulator; A weak fuel pump; A clogged fuel filter; A faulty powertrain control module (PCM) A vacuum leak; Faulty injector(s) Faulty oxygen sensor(s) A faulty mass air flow sensor; How to Fix Code P0171. The most common repairs needed to fix the P0171 engine code are as ..., Code P0171 - System Too Lean: Symptoms, causes, common problems, diagnostic. By Vlad Samarin, Updated: July 10, 2021. The OBDII trouble code P0171 - System Too Lean (Bank 1) means that …, The P0171 code means that the O2 sensor recognized a lean mixture on bank 1. The sensor can only correct the mixture within +-15%, and if it is out of there, the …, La conexión de la manguera positiva del cárter (PCV) está en mal estado. Existen fugas de escape entre el motor y el sensor de oxígeno 1. Los síntomas que pueden llevar a diagnósticos del código de falla P0171 pueden ser: Testigo de Check Engine encendido en el cuadro de mandos. Aumento del gasto de combustible., Share. Code P0171 indicates Bank 1 of the engine has a lean fuel mixture. P0174 indicates Bank 2 of the engine has a lean fuel mixture. Engine Bank 1 is the same side of the engine as Engine Cylinder 1. Engine Bank 2 is the opposite side of the engine. A firing order and cylinder location diagram may be needed to see which side of the engine is ..., When the P0171 code sets, the oxygen sensors are detecting too little oxygen in the exhaust (running "lean") and the control module is adding more fuel than normal to sustain the proper air/fuel mixture. Rich Mixture = Too much fuel, not enough air. Lean Mixture = Too much air, not enough fuel. Driving with this trouble code is not recommended., When the inevitable happens, your vehicle is going to store code P0171 – System Too Lean Bank 1. A P0171 can often pop up with a P0174 (System Too Lean Bank 2). Ideally, the stoichiometric ratio for your fuel system is 14.7 parts air to one part fuel, which provides a balanced mixture of fuel economy, performance and lower emissions during ..., Share. Code P0171 indicates Bank 1 of the engine has a lean fuel mixture. P0174 indicates Bank 2 of the engine has a lean fuel mixture. Engine Bank 1 is the same side of the engine as Engine Cylinder 1. Engine Bank 2 is the opposite side of the engine. A firing order and cylinder location diagram may be needed to see which side of the engine is ..., Aug 19, 2020 · Vídeo explicativo sobre el CÓDIGO DE FALLA P0171. Descubre qué significa, por qué ocurre y cómo solucionarlo correctamente.LEER SOLUCIÓN DEL CÓDIGO OBD2 EN... , Oxygen Sensor. The P0171 code is thrown when the bank one sensor one O2 sensor reports that your CR-V’s engine is running lean. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. If it is malfunctioning, it can cause a false P0171 code. Swap Test., Código P0171: Análisis, Síntomas, Diagnóstico y Soluciones. El Código P0171 Genérico es una señal que nos alerta sobre una condición anómala en el sistema de combustión de un vehículo. Este código nos indica que se ha detectado un nivel demasiado bajo de oxígeno en el sensor de oxígeno del banco 1 del motor, lo que a su vez ..., Los signos de un código de falla P0171 Audi pueden ser: Sistema demasiado pobre en el banco 1; Se enciende la luz de fallo de motor (Check Engine) Consumo excesivo de combustible; Pérdida de potencia del motor; Causas del código DTC P0171 Audi. Se pueden encontrar numerosas razones para la presencia de un código DTC P0171 Audi en un auto ... , Fuel Injectors. P0171 indicates that your Chevy Sonic is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0171., Se debe de tener en cuenta que el código de diagnóstico OBD2 P0171 es un código genérico, por lo que este código DTC puede ser provocado en cualquier automóvil independientemente de que sea un vehículo de la marca …, Fuel Injectors. P0171 indicates that your Honda Accord is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0171., Nov 11, 2018 · It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. P0171: Fuel Trim System Lean (Bank 1). Check engine light, decreased fuel economy, misfire, hard to find idle. Dirty MAF sensor, vacuum leak, O2 sensor. , Nov 11, 2018 · It is also one of the most common codes. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor. P0171: Fuel Trim System Lean (Bank 1). Check engine light, decreased fuel economy, misfire, hard to find idle. Dirty MAF sensor, vacuum leak, O2 sensor. , The FDIC insures all the money you put into the bank up to $250,000. Learn how the FDIC works in this article from HowStuffWorks. Advertisement If you bank in the United States, yo..., Si has encontrado el código de falla P0171 en tu vehículo Toyota, es crucial tomar medidas inmediatas para evitar mayores daños. El mantenimiento regular y las inspecciones son clave para evitar este problema por completo. Aquí tienes algunas medidas que puedes tomar para evitar que aparezca el código de falla P0171:, Sep 21, 2023 · El código P0171 Toyota significa que el sistema de combustible está fallando y que la gasolina no está llegando al motor. Esto puede deberse a una variedad de factores, incluido un sensor de oxígeno defectuoso, un filtro de combustible obstruido o una fuga de vacío. Cuando el motor funciona pobremente, puede causar daños al convertidor ... , 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 may cause the MAF …, The P0171 code is a common diagnostic trouble code that indicates a lean condition in the engine’s fuel system. It often points to potential issues with the mass air flow sensor, oxygen sensors, or even a vacuum leak. Understanding this code is crucial when it comes to troubleshooting and maintaining your Ford vehicle’s performance., By Vlad Samarin, Updated: July 10, 2021. The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher., Veterans and active-duty military members and families can save money and enjoy some travel perks with these Veterans Day deals and discounts. As we honor all those who have served..., O erro P0171 indica uma falha no/na ( Sistema muito pobre, bloco 1 . O que causa o código P0171? Em resumo isto pode acontecer por vários motivos, tais como problemas no/na "Fuga não sistema de admissão/escape, sistema de injeção de ar secundário, sensor de fluxo de massa de ar/de volume de ar, pressão/bomba de combustível, injetor (es ..., Some common causes of the P0171 code may include: A faulty fuel pressure regulator; A weak fuel pump; A clogged fuel filter; A faulty powertrain control module (PCM) A vacuum leak; Faulty injector(s) Faulty oxygen sensor(s) A faulty mass air flow sensor; How to Fix Code P0171. The most common repairs needed to fix the P0171 engine code are as ..., Description P0171 este codigo casi siempre es causado por un problema de vacio. STFT antes era 25% despues de arreglar el vacio cambio a negative 1.6%, The most common repairs needed to fix the P0171 engine code are as follows: 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. , Oct 21, 2019 ... This code is saying there is a lean mixture on bank one, the one against the firewall where cylinder one is. But, here's the kicker, ..., Descripción y causas del código de avería P0171 de Peugeot. Consulta la descripción y solución de códigos de averías de diagnóstico OBDII usados por los mecánicos. , On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses ..., The most common repairs needed to fix the P0171 engine code are as follows: 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.