What repairs can fix the P0171 code?
Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass airflow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.
Which o2 sensor is P0171?
An “under reporting” Mass Air Flow Sensor can be a common cause of a code P0171. Essentially, this means that the Air Flow Sensor is telling the computer that much less air is entering the engine than actually is.
Can a bad gas cap cause P0171?
It doesn’t set a code that is false.
What does the error code p0171 on a Lexus mean?
Lexus: What Does Error Code P0171 Mean? The P0171 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.
What does the p0171 code on an OBD mean?
The P0171 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.
What does lean condition mean on a Lexus?
A lean condition occurs when the engine either receives too little fuel or too much air. Every Lexus vehicle comes equipped with an OBD connector which can be used to send messages to an OBD2 troubleshooting reader like the one below.
Where do I find the Diagnostic Code on my Lexus?
Simply connect the scanning tool (or a computer with scanning software downloaded) to the connector (located under the steering wheel) and the readout will show you Diagnostic Trouble Codes that might be affecting your car. From there, you can look up the code at ClubLexus.com to learn what’s going on and try to repair it yourself.
Can a MAF sensor cause P0171?
What causes lean codes?
Lean codes can also be set if the engine is not getting enough fuel. The underlying cause might be a weak fuel pump, low voltage to the fuel pump (which prevents the fuel pump from spinning fast enough to deliver normal fuel flow), a restricted fuel filter, or possibly a leaky fuel pressure regulator.
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.
Can bad spark plugs cause a P0171 code?
A P0171 ( too lean, Bank 1 ) code is most often caused by a vacuum leak downstream from the MAF sensor or a malfunctioning MAF sensor. Bad spark plugs could actually cause the opposite code ( too rich, bank 1).
What does P0171 System Too Lean Bank #1 mean?
The P0171 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.
What does P0171 system Too Lean Bank #1 mean?
What does it mean when your car says p0171?
Since the error code p0171 means the presence of a lean mixture in a vehicle, various sensors may cause the code. In order to diagnose this code, do the following: This is part of the troubleshooting process, with which you turn on ignition while not wanting to achieve low voltage.
What does p0171 system too lean Bank 1 mean?
P0171 System Too Lean Bank 1 Technical Description. System Too Lean (Bank 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.
Can a faulty MAF sensor cause a p0171 code?
If you start replacing MAF sensors, O2 sensors, etc., you will probably spend a lot of money without results. A faulty O2 sensor is not a very common cause of the P0171 code, even if many people start to replace it directly when they see this code.
When does the front O2 sensor Register p0171?
P0171 is triggered when the front O2 sensors recognize a lean mixture. It can both be a short-term lean mixture or a long-term lean mixture. If it’s a short-term lean mixture the fuel mixture is often very lean. If it’s a long-term mixture, it can register the code because of a small notice of lean mixture over time.
