How do you fix code P0171?
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.
How much does it cost to fix P0171?
A broken vacuum hose sucking in air can be around $50, or a clogged fuel filter for $100. On the other hand, an oxygen sensor or mass air flow sensor can bring a bill of $400 to $500 dollars. A bad fuel pump can be really expensive costing around $600 to $800.
How do you test a MAF sensor?
Set your meter at or close to 10 V DC. Start the engine and let it idle. Backprobe the signal and ground wires (red probe to signal and black probe to ground). Depending on your MAF sensor, your voltage reading should be between 0.60 to 0.80 volts at idle.
What are the signs of a bad mass airflow sensor?
Symptoms of a Faulty Mass Air Flow Sensor
- The engine is very hard to start or turn over.
- The engine stalls shortly after starting.
- The engine hesitates or drags while under load or idle.
- Hesitation and jerking during acceleration.
- The engine hiccups.
- Excessively rich or lean idling.
What should happen if I unplug MAF sensor?
If you plug it in it will die if the car is running. If you unplug the mass air flow sensor the car will start. If you try to plug it in while it’s running the car will die.
Should I clean or replace my mass airflow sensor?
The design and function of the mass air flow sensor Both are delicate and may be damaged if you try to clean them. For this reason, it’s better to replace the sensor than to attempt to clean it and continue using it. The MAF sensor measures the amount of air that comes into the system.
What makes a MAF sensor go bad?
Contamination is a key reason why MAF sensors fail and require replacement. As air, dirt and other debris get into the sensor, the parts become contaminated and fail. Drivers often notice sluggish performance, rough idling, poor acceleration or even stalling.
Can I drive with MAF sensor unplugged?
Yes you can temporarily drive with the MAF sensor disconnected.
Can you clean a MAF sensor?
We recommend that you clean the MAF sensor every time you change your air filter. Carefully remove the sensor from the air duct and disconnect the electrical connector. Spray 10 to 15 spurts of the mass air flower cleaner onto the wire or plate. Don’t scrub the parts; you may break the wire or damage the plate.
What should MAF be at idle?
With the engine at idle, the MAF’s PID value should read anywhere from 2 to 7 grams/second (g/s) at idle and rise to between 15 to 25 g/s at 2500 rpm, depending on engine size. Most manufacturers provide specifications for air flow at idle; some will provide specifications at several engine speeds.
Does MAF sensor affect idle?
Mass Air Flow Sensor (MAF) The MAF measures the rate of air flowing into fuel-injected engines. A dirty or faulty MAF will cause an engine to idle roughly, as well as stall when idling.
Can a MAF sensor cause a misfire?
Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn’t getting enough throttle opening.
Can a MAF sensor cause rough idle?
The mass airflow (MAF) sensor can also cause a rough idle. This sensor measures the amount of air flowing into the engine using a sensing element. On most cases, a malfunctioning MAF sensor will cause the computer to store a trouble code. So scan your computer for trouble codes.
What causes rough idle at startup?
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
Why does my RPM go up and down while idle?
Among the potential underlying causes are vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, or a faulty throttle position sensor.
Where is idle control valve located?
The idle air control (IAC) valve is located on the throttle body of fuel-injected engines, where it works with the vehicle’s ECU to electrically regulate airflow to the engine to ensure smooth idling.
What causes engine RPM to fluctuate?
Why does my engine’s RPM seem to fluctuate (runs rough)? Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil.
What are the symptoms of a bad air idle control valve?
- How an Idle Air Control Valve Works.
- Bad Idle Air Control Valve Symptoms. 1) Intermittent Idle Speed. 2) Check Engine Warning Light. 3) Rough Idling. 4) Engine Stalling. 5) Load Causes Stalling.
- Idle Air Control Valve Replacement Cost.