Why do I keep getting a P0101 code in my 2011 Nissan Sentra

Service Engine Soon came on. Plugged in OBDII scanner to see what code it was. Turned out to be P0101. I cleaned old maf sensor, put it back, and cleared the code. The code came back after a couple of days. Ordered a new maf sensor, it turned out to be remanufactured but I went ahead and replaced it anyway. I cleared the code and 2 days later, the same code came back. I cannot seem to figure out what the problem is.

My car has 118000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. If you are continuing to get the same code then the engine needs to be checked first for any vacuum leaks. The slightest leak in the intake tubes or any of the vacuum hoses or gaskets will cause this. I usually will do a smoke test to find the issue. If there are no leaks then you may have a defective sensor. I do not like to use re-manufactured MAF sensors. If the sensor is known to be good then it may be a circuit issue, which is rare on this vehicle. If you need help with this, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light continues to come on] https://www.yourmechanic.com/services/check-engine-light-is-on-inspection

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

This code is most commonly caused by a dirty, obstructed, or faulty MAF sensor, but can also be caused by issues including: Damage to the intake boot. Vacuum leaks. Clogged or improperly installed engine air filter.
If your car is displaying engine code P0101, the Mass Air Flow (MAF) sensor is sending either too high or too low of a signal to the Engine Control Module (ECM). The ECM regulates and monitors the temperature of the MAF sensor to determine whether the right amount of air is flowing through the intake.
The mass air flow (MAF) sensor measures the amount of air entering the engine. Check engine light code P0101 is set when the measurement of air entering the engine by the mass air flow sensor is outside of the manufacturer`s specified range.
Typically, error code P0101 is caused by a fault in your MAF circuit. Your MAF sensor is situated in your engine`s air intake track. It measures the volume and density of air downstream from the air filter.
Error code P0101 indicates that there is an issue with your mass airflow sensor (MAF).
If your O2 sensors or mass airflow sensors fail, as mentioned above, they can cause a P0101 code to display, and can also cause other problems for your engine over time.
A clogged catalytic converter can sometimes trigger the P0101 code, but it is not a common cause. The P0101 code relates explicitly to the Mass Airflow (MAF) sensor circuit performance, which means that the issue is likely related to the MAF sensor, air filter, vacuum leaks, or wiring and connections.
The air filter may be the MAF sensor`s first line of defense via the engine`s air intake system, but a clogged, low quality or dirty air filter can actually become the source of MAF sensor damage if any contamination bypasses it.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Why do I keep getting a P0101 code in my 2011 Nissan Sentra
ANSWER : Hello. If you are continuing to get the same code then the engine needs to be checked first for any vacuum leaks. The slightest leak in the intake tubes or any of the vacuum hoses or gaskets will cause this. I usually will do a smoke test to find the issue. If there are no leaks then you may have a defective sensor. I do not like to use re-manufactured MAF sensors. If the sensor is known to be good then it may be a circuit issue, which is rare on this vehicle. If you need help with this, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light continues to come on] https://www.yourmechanic.com/services/check-engine-light-is-on-inspection

I was told that p1273 code for my 2004 Nissan maxima is gonna keep coming on until I get oxygen sensor from actual Nissan dealersh
ANSWER : Hi there. When it comes to replacing O2 sensors or any other sensor, it is always recommended to use an OEM or original equipment manufacturer replacement part. The sensor is designed to collect data and transmit it through an electrical harness and to the ECU to be stored. However, it is possible that the electrical harness itself is the reason why your receiving this error code (which is specific to Nissan vehicles). You might want to have a professional mobile mechanic come to your location to determine the right course of action by completing a check engine light inspection.

Getting 2 then 4 abs codes, brake shutters, speedo dies and engine slowes when Brake and absolutely lights come on,
ANSWER : You definitely want to start by inspecting the front and rear wheel speed sensors; a failure in these circuits will result in several other problems. Begin by connecting a scanner to see if the Powertrain Control Module (PCM) is registering the sensors accurately. With the scanner, you should be able to monitor all the wheel speed sensors while driving. Keep in mind, the rear wheel speed sensor is mounted on the transmission and is the sensor that runs your speedometer.

Once you determine which sensor is not registering, visually inspect the wiring harnesses and, if everything looks good, replace the sensor. In most cases, the sensor is the problem. If you suspect a wiring problem that isn’t visually apparent, you will need to do a continuity test from the PCM to the sensor connector.

If you determine that all the speed sensors are good, you should suspect a problem with ABS pump. The C0267 trouble code indicates there is a wiring problem in the harness to the ABS pump. It is possible that this is the main problem. To test this, you should disconnect the connector from the ABS pump and visually inspect the pins on both ends. A continuity test should be performed in this harness as well.

There are more test procedures for this that are a bit involved. If you are interested in digging more into this, you should pick up a factory repair manual, not a Chilton. The factory repair manuals are superior and you definitely want good information to make a correct diagnosis of your car.

If you need help with this, I recommend an "ABS light is on" inspection.

Good luck!

I had a p0405 get code replaced egr valve, map sensor,mad sensor, and PCv valve just to be safe but still getting the code why?
ANSWER : The code P0405 and a rough idle is most likely due to carbon getting into the EGR pintle. This will hold the EGR open. When you are getting the rough idle you should shut off engine and remove EGR valve. Check to see if carbon is holding the pintle open. If it is then you will have to remove the carbon from the pintle. Then try and clean out the EGR passages by scrapping them using a round wire brush. Afterwards, start the engine for a few seconds with valve removed to blow out loose carbon. You should then spray a small amount of carbon cleaner into the passages to dissolve the carbon. Lastly, reinstall the EGR and reset the light and codes.

If you’d like assistance with this, consider YourMechanic, as a certified professional can come to the vehicles locations to perform these checks and properly diagnose your Check Engine Light.

Check Engine Light codes. 2006 Mercedes Benz E55 AMG
ANSWER : Since you are getting many different codes from different areas of the engine, you may need to have the system hooked up to a factory scanner since most of these generic codes do not cross over in my repair software. I would also check with the local dealer to see if any service campaigns are open on the vehicle since there are over 30 possible campaigns that could pertain to this vehicle and some of the problems you are having with the secondary air system. This may be the cause of some of the codes and supercharger disabling. If you’d like to have this checked elsewhere, a qualified pro from YourMechanic can come to your car’s location to go through each Check Engine Light code firsthand and have them resolved.

My Nissan Sentra 2014 indicator light is on.
ANSWER : Hi there. The slip indicator light could be on for a numerous items. The main items that is causing your rpm’s to fluctuate are the camshaft position sensor (CPS) and the idle air control valve (IAC). The CPS will cause the engine to hesitate and run odd when the sensor is not responding. The IAC valve will stick causing the idle to fluctuate and not operate correctly. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your engine light codes.

EGR code, Cylinder 4 misfire code 0304 detected.
ANSWER : Hi there. The Exhaust Gas Recirculation (EGR) valve may be not designed for the emissions requirements for U.S. standards. If the EGR is pulling from cylinder number 4 and after replacing the EGR and the computer detects a misfire, then the EGR is malfunctioning and not responding. When you close off the tube to the EGR and the EGR light comes on and the misfire light goes out, then the EGR is not responding to your emissions system. I recommend replacing the EGR with the OEM specified part for the engine and all of the issues should go away. If you need further assistance with your misfire and EGR, then seek out a professional, such as one from Your Mechanic, to help you.

I have a 2006 Audi A3 2.0T I keep getting the code p0089 valve for fuel metering N290 implausible signal.What do i have to change?
ANSWER : To resolve diagnostic trouble code P0089, the mechanic would test the fuel pressure regulator, check for a clogged fuel filter or screen, check for restricted fuel lines, and test fuel pump output. Typically, the problem will be found in those latter areas. With regard to the stalling, given that the code references potential fuel starvation issues, it is plausible that the stalling is related to the fault that has caused P0089 to set. To get this problem resolved expeditiously, please request a check engine light diagnostic and a certified mechanic from YourMechanic will be dispatched to pinpoint the cause of the fault. Once the faulty part or component is identified, it is explained to your satisfaction and the mechanic will let you know of the cost to repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.