I unplugged mass air flow sensor

I unplugged mass air flow sensor while car was on and it didn't turn off and then check engine light appeared how long will the light stay on?

My car has 440000 miles.

Experienced mechanics share their insights in answering this question :
When you unplugged the part while the engine was running, the Electronic Control Unit (ECU) saw it as a component failure and lit up the check engine light. There will now be a code stored for the air mass meter. The check engine light may go off after about 50 drive cycles (a few weeks for most people) if the ECU doesn’t see any more problems, but the stored code will remain until it is cleared. You can have the codes cleared and the light put out by contacting Your Mechanic. They can send a technician to your home or office to read and clear the ECU right there on the spot.

How to Identify and Fix Common car Problems ?

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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.
After Installation of the new MAF:

But if the motor continues to have problems, run the engine idle for 20-30 minutes. 2. You can reset the ECU by disconnecting the battery for 10 min.

A faulty mass airflow sensor is a common reason why a check engine light comes on. If the engine control module receives a MAF error code, it will turn on the check engine light to let you know that there is a problem with the engine.
yes MAF can go bad w/out triggering the SES light.
The MAP sensor`s job is to determine the load being placed on the engine and deliver fuel to the engine accordingly. With the MAP sensor disconnected, the fuel delivery will be excessive and could cause harm to the engine and exhaust system (catalytic converters).
Reset the MAF sensor by idling your engine without the sensor installed for at least 10 seconds. You can also reset the MAF sensor by removing the negative battery terminal and waiting 10 minutes. You may be able to drive without the MAF sensor, but it`s bad for your engine to drive without the sensor for too long.
Yes, you can run a car without its MAF sensor, but it`s not recommended, because the car will not run nearly as well and will get horrible fuel mileage.
Yes, the MAF sensor should be calibrated for the injector size. And yes, at some point you`ll likely have to increase injector size if you keep adding horsepower. At that point, you`ll also want to match the MAF sensor up to the increased fuel injector size.
The Light Stays On

You may think that there is still a problem with the car after the repair, but it`s because the light needs time to reset. The car`s internal computer only resets after a set period where it checks all of its sensors once more. The reset can happen automatically after around 10 to 20 cycles.

MAF sensors can become damaged, but more often they just get too dirty to do their job well. In this case, they can be cleaned but if it is a mechanical or electrical failure, they must be replaced.
Error code P0101 indicates that there is an issue with your mass airflow sensor (MAF). In this case, the MAF is out of its intended range. Other codes ranging from P0100-P0109, P0505-P0507, and P2096-P2099 often appear simultaneously with this code, given their similar proximate causes.
There are several symptoms of a bad MAF sensor, and not all of them are immediately obvious: Illuminated Check Engine Light: Performance and circuit diagnostic trouble codes may refer directly to the MAF sensor, but fuel trim and misfire codes can also be linked to the MAF sensor.
MAP sensors contain no moving parts, and they don`t typically wear out, but cleaning the MAP sensor may be required if it`s contaminated by carbon or other deposits from the engine. If voltage is slow to respond to pressure changes, contamination could be responsible.
To remove the old sensor, first disconnect the negative battery cable. This will ensure that the car is not damaged when the sensor is removed, and will also reset the vehicle`s computer and trouble codes.
Do you have to reset a mass air flow sensor? Yes, disconnecting the battery for around 10 to 15 minutes is an important step to take after replacing the MAF sensor to ensure that the sensor resets. This way the computer will forget the parameters it had previously learned and adjust to the new settings.
The result is improved engine performance and fuel economy. The MAF sensor also helps to ensure that the engine operates within safe parameters by monitoring the air/fuel ratio. If the air/fuel ratio is too rich (too much fuel), the MAF sensor will send a signal to the ECU to adjust the fuel injection accordingly.
A mass air flow typically last between 80,000 miles to 150,000 miles. Proper maintenance of the mass air flow and cleaning it will help prolong its life. However, there are a few vehicle symptoms that will tell you when it is time to replace the air flow sensor. The first symptom is hard starting.
A bad MAF sensor can cause your vehicle to experience poor drivability issues such as engine stalling, jerking or hesitation during acceleration. This could happen while speeding up on the highway on-ramp or cruising down a city street. These issues can create dangerous situations causing accidents and injury.
What are some differences between a MAP and MAF sensor? While a MAF sensor is always located before the throttle body, a MAP sensor can usually be found attached to the intake manifold. Because it is in the intake tract, A MAF sensor will also have its own housing (usually plastic) to hold it in place.
MAF Diagnostics with a Multimeter

Basically, all MAF sensors have four wires. If the MAF has more than four wires, the extras are for the intake air temperature sensor that has been incorporated into the MAF housing. guesswork with a basic multimeter. The real key to testing with a multimeter is the signal return lead.

Will your check engine light turn off by itself? In most cases, successfully repairing the issue that caused your light to come on will cause the check engine light to turn off automatically—but only after 10 to 20 “cycles”.
Pop the hood open. Lightly tap the MAF sensor and electrical connector with a screwdriver handle. Wiggle the wires as well. If the engine stalls, idle is upset, or idle gets better, the MAF sensor is likely defective.
Your car`s Mass Airflow sensor, or MAF sensor, can cause several problems with how your engine runs, including but not limited to rough idle, mild to severe hesitation, loss of power, poor fuel economy, and even the engine stalling – yes, even in an automatic car.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My code reader says I have a bad mass air flow sensor ans crank shat sensor test drive ran better shut off & engine Lt. Same code
ANSWER : Hi there. The problem you are describing, sounds like you may have a poor connection in the connector at the mass airflow sensor. Although, sometimes aftermarket parts do not perform as well as factory (OEM) parts. Check for corrosion and/or wide spacing in the terminal ends. Compare the terminal ends in the connector using a flashlight to see better. The terminals can be tightened. If you are not comfortable with doing that, a replacement pigtail (connector) is available. You vehicle may require further diagnosis performed with a scanner that provides parameters that can be viewed as the fault occurs. If that is the case, I recommend having your vehicle’s electrical circuits inspected in order to pinpoint the underlying fault.

check engine light read mass air flow sensor
ANSWER : First of all, cleaning a mass air sensor may not have fixed the sensor and O2 sensors cannot be cleaned. The O2 sensors for bank 1 and bank 2 means that the left and right side of the engine. You have one sensor just below the manifolds on each side of the motor and then sensors after the catalyst. There may be more than three or four sensors on the truck depending on if you have dual exhaust catalyst or not. Each sensor will have a specific code that relates to it in the computer when a failure happens. Your O2 sensors may only be telling you that you are running too lean on both banks of the engine and may have a mass air sensor or fuel injection fuel flow problem that is the cause. Have a mechanic properly diagnose the Check Engine Light before replacing or cleaning the sensors to try and fix the issue. A qualified mechanic will have to do the pinpoint tests to isolate the cause. This will save you money in the long run by not replacing parts that are not needed.

Rough idle after replacing Mass Air Flow Sensor – trouble codes P0171 and P0102
ANSWER : The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is a problem with a BARO (barometric pressure) sensor that is reading faulty. Its purpose is to measure atmospheric pressure, the amount of air entering the engine, and supply the ECM with a calculated reading that allows the engine to make corrections accordingly.

If the BARO sensors readings are off, the supplied amount of fuel will be incorrect, and can therefore cause running issues. I would first check all of the intake plumbing to be sure it is all seated and tight, and then test the BARO sensor for correct function.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why your car is idling rough and if the barometric sensor needs replacing.

P0300 codes while idling
ANSWER : Hello. If unplugging the MAF sensor causes the engine to run better then there is a secondary air leak into the engine. This means that there is a vacuum leak from someplace. Most of the time on this engine it is from the intake manifold. It may also be a rich condition that can be from the fuel injection unit.

I usually check this by installing a scan tool to see what the fuel trim readings are. This will tell me if it is getting too much air or fuel and where to start. I have seen more intake manifold gasket failures on this engine than anything else. If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to you home or office to diagnose your Check Engine Light and repair it accordingly.

The car keeps cutting off, i brought idle air contol, mass air flow, and map sensor. What could be wrong
ANSWER : There are many faults that can cause a vehicle to stall. A faulty engine speed sensor or weak fuel pump just to start. If the Check Engine Light is on, the vehicle can be scanned for fault codes. The fault codes will not tell the mechanic what to fix, but will be a good place to start when looking for problem components. I recommend getting a second opinion on the issue. The stalling problem should be thoroughly diagnosed by an experienced mechanic who can check several parameters in order to track down the bug before moving forward with repairs.

I unplugged mass air flow sensor
ANSWER : When you unplugged the part while the engine was running, the Electronic Control Unit (ECU) saw it as a component failure and lit up the check engine light. There will now be a code stored for the air mass meter. The check engine light may go off after about 50 drive cycles (a few weeks for most people) if the ECU doesn’t see any more problems, but the stored code will remain until it is cleared. You can have the codes cleared and the light put out by contacting Your Mechanic. They can send a technician to your home or office to read and clear the ECU right there on the spot.

Trying to locate the Mass Air Flow sensor , and the Idle Air Control valve 2002 Ford Fiesta
ANSWER : Hello – Mass Air Flow meter is a short, cylindrical section of the air intake, just inside of the air filter housing, and just before a large cuved plastic-molded piece of the air intake. It has a flat electrical connector plugged into it. The idle air control valve is just past the throttle body in the intake, on the engine side of the throttle body. It is a small cylindrical tube about 1 1/2: in diameter and 4 inches long, bolted to the intake manifold with an electrical connector. For the effects of dirty sensors – click here.

Can a collision in the front of my car cause a mass air flow sensor to malfunction? I need to make a claim for the insurance.
ANSWER : Unless the sensor has been physically damaged by the accident you were in, it would be impossible to know if it was damaged by the accident or not. The MAF sensor is a common sensor to fail on these vehicles and can get contaminated with debris and oils from aftermarket oil type air filters or not changing the paper air filter often enough and these contaminants will foul the MAF sensor and cause it to fail. If you feel the sensor only failed immediately after the accident then try and get the insurance to cover it. You may have a hard time getting it covered by them. If you need a mechanic like one from YourMechanic to test and replace mass air sensor then set up an appointment and quote.