What causes a Hyundai engine code p0171 to fail?
P0171 HYUNDAI – System Too Lean Bank 1… Possible causes – Intake air leaks – Faulty front heated oxygen sensor – Ignition misfiring – Faulty fuel injectors – Exhaust gas leaks – Incorrect fuel pressure – Lack of fuel – Faulty Mass Air Flow (MAF) sensor – Incorrect Positive Crankcase Ventilation (PCV) hose connection.
What does the p0171 code on my air filter mean?
If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. 9 people found this helpful.
When to use lean condition code p0171?
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.
When to replace oxygen sensor in Hyundai p0171?
If any components in the fuel system are failing, replace them as necessary. If you confirm there are no vacuum leaks, have a clean mass air flow sensor, and your fuel system is functioning properly, it is time to replace the oxygen sensors.
What does the code p0171 mean on a car?
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.
What is the cause of Hyundai p0171 air leak?
It is important to complete the entire diagnostic process when diagnosing P0171. Many people will replace the air fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty mass air flow sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate.
If any components in the fuel system are failing, replace them as necessary. If you confirm there are no vacuum leaks, have a clean mass air flow sensor, and your fuel system is functioning properly, it is time to replace the oxygen sensors.
Why is my MAF sensor sending out a p0171 code?
How to Fix P0171 and P0174 While inspecting the intake boot thoroughly, another option is to stop at the MAF sensor itself. MAF sensors can get dirty or oiled and send out a false signal, but usually this is also indicated by a MAF trouble code as well.