How do I fix P0171 System Too Lean Bank 1?
What repairs can fix the P0171 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.
What does P0171 System Too Lean Bank #1 mean?
The P0171 OBD-II 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.
How do I reset my P0171 code?
Fixing a Check Engine Light (P0171)
- Step 1: Purchase a OBD 2 Bluetooth Scanner.
- Step 2: Insert the Scanner Into the OBD 2 Port of Your Car.
- Step 3: Run a Diagnostic Scan.
- Step 4: P0171.
- Step 5: Removing the Mass Air Flow Sensor.
- Step 6: The MAF Sensor.
- Step 7: Clean the Sensor.
- Step 8: Clear the Code.
Can a bad fuel pressure regulator cause a P0171 code?
A low fuel pressure will cause a deficient fuel delivery and as a consequence a possible code P0171. A bad fuel pressure regulator can be the culprit here, check out our article on the symptoms of a bad pressure regulator to learn more.
What does it mean when bank 1 system too lean?
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.
How do you fix P0171 and P0174?
If your computer logged both P0171 and P0174 codes, concentrate on those components affecting all cylinders, like a MAF sensor, a clogged fuel filter, or issues with a fuel pressure regulator. Otherwise, concentrate on the side of the engine represented by your diagnostic trouble code.
Can a dirty air filter cause a car to run lean?
In extreme cases, a contaminated air filter can turn on the check engine light. An extremely dirty air filter restricts engine air intake. This disrupts the air/fuel mixture inside the engine. As a result, the vehicle may experience performance problems that trigger the check engine light.
What does p0171 mean for your Ford engine?
System too lean (Bank 1). What Does P0171 Mean For Your Ford? Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered.
Why is the p0171 code too lean Bank 1?
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.
What is the OBDII code on a Ford Focus?
One of the most common trouble codes with the Ford Focus is the P0171 code. This code number references a number that is given to you when you plug your car into a OBDII scanner. It’s not the most complicated OBDII trouble code to diagnose. It is also one of the most common. P0171 is an OBDII trouble code. The code technically stands for: