How do I fix code P0171 Ford?
How do I fix code P0171 Ford?
Remove the mass air flow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass air flow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.
What side is lean Bank 1 on in f150?
The Ford F-150’s Bank 1 O2 sensor should be found on the right or passenger side of the truck under the vehicle, near the engine before the catalytic converter. Look 12 inches above the converter, near the firewall to access it.
What does code P0171 and P0174 mean?
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.
What causes P0171 and P0174 codes Ford f150?
COMMON CAUSE: A DIRTY MAF SENSOR One of the most common causes of Ford P0171 and P0174 lean codes is a dirty mass airflow (MAF) sensor. The MAF sensor can also be contaminated by fuel vapors that back up through the intake manifold and throttle body when the engine is shut off.
Can a bad EGR valve cause a P0171 code?
You will find a leak or a faulty one-way valve that is causing the P0171 code in most cases. An EGR valve stuck open can cause the air-fuel mixture to stay lean. If possible, try to check the valve inside it while you open and close it with your diagnostic tool. Clean the MAF sensor.
Can you drive with a P0171 code?
It is okay to drive a vehicle with P0171 for a short period of time, but driving with this code for an extended period of time can overheat the engine and cause internal engine damage.
Can a dirty air filter cause a P0171 code?
If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.
Can a MAF sensor cause P0171?
Problems with the mass air flow (MAF) sensor causing the code P0171 are fairly common in many vehicles. Sometimes the mass air flow sensor just gets dirty and gives false air flow readings causing the engine to run lean.
How do you fix code P0171?
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 causes P0171 and P0174 codes Ford?
What does the OBD2 code p0171 mean on a Ford F150?
Ford F150: P0171 and P0174 Diagnosis. July 7, 2020 by Jason. P0171 and P0174 both indicate that there is a lean condition present in your Ford F150. By themselves, these are some of the most common OBD2 codes. When they appear together, it indicates that the entire engine is running lean.
What causes the p0171 code on a diesel engine?
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. The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture.
What does p0174 mean on a fuel trim system?
P0174- Fuel Trim System Lean → Bank 2: P0174 indicates that the side of the engine with the first cylinder (Bank 2) is running lean. On inline engines, this code is not available, since there is only one “bank” of cylinders. Lean Condition Meaning: The engine is bringing in too much air to the amount of fuel present.
