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  • The P0100 code is logged once the powertrain control module (PCM) perceives a problem with the Mass Air Flow (MAF) sensor or circuit.
  • The common causes of this error code include a failed or dirty MAF sensor, a MAF circuit issue, and PCM problems.
  • Aside from an illuminated check engine light, other common symptoms of a P0100 code include a rough running engine, stalling, and hard starting.

Did your scanner register the P0100 code? Wondering what does a diagnostic code P0100 mean? Here’s a guide to the important things you need to know about it, from its causes and symptoms to its diagnosis and repair process.

What Does the P0100 Code Mean?

Diagnostic trouble code (DTC) P0100 stands for “Mass or Volume Air Flow ‘A’ Circuit.” It means that the powertrain control module (PCM) perceives a problem with the Mass Air Flow (MAF) sensor or circuit.

mass air flow sensor on air filter housing
P0100 Code means that the powertrain control module (PCM) perceives a problem with the Mass Air Flow (MAF) sensor or circuit.

The MAF sensor is located in the intake air duct. It is tucked between the air filter and the engine intake manifold that measures the density and volume of the air intake. Some MAF sensors have an intake air temperature sensor, which delivers values that the PCM uses to ensure optimal operation.

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It is important that the MAF sensor is always working properly because it converts airflow measurements into voltage or frequency signals. If the PCM computer detects that the signal coming from the MAF sensor is short, beyond the expected range, or unresponsive for a specific amount of time, it will issue the code P0100.

The code P0100 is similar to the code P0104, which stands for “MAF Sensor Circuit Intermittent/Erratic.” They only differ based on the consistency of the malfunction.

mass air flow sensor 1
It is important that the MAF sensor is always working properly because it converts airflow measurements into voltage or frequency signals.

If you’re planning to fix code P0100 yourself, you’ll find more useful information in our advanced technical discussion about mass air flow.

What are the Possible Causes of the P0100 Code?

Here are the common causes of DTC P0100 code:

Although a failed MAF sensor can be the culprit, a fault in the wiring or connectors is often the one to blame when it comes to codes like the P0100. Diagnose the issue first before investing in a MAF sensor replacement.

What are the Common Symptoms of the P0100 Code?

You may experience driveability symptoms if you continue driving your car while the P0100 code is set. However, it’s also possible that you’ll observe no symptoms at all. Keep an eye out for these symptoms:

See also  P0103 Code: Mass or Volume Air Flow “A” Circuit High

How to Diagnose the P0100 Code

Similar to other trouble codes, there could be varying diagnostic processes for the code P0100. After all, different issues can trigger it. You’ll need to have a clear understanding of the code as well as the affected part to troubleshoot it. You can watch this video for more details on P0100:

How to Fix the P0100 Code

There’s no universal fix for code P010061. Many carmakers have specific repair instructions for their vehicles, so it’s possible that the first fix you find online will not apply to your situation. You may use the owner’s manual when working on something in your car. But if you want a guaranteed solution, it’s better to bring your car to a professional mechanic.

Feeling confident with your DIY skills? Back your knowledge up with an ALLDATA single-vehicle subscription. An ALLDATA subscription is helpful not only for this repair but for other issues in the future. You may also reinforce your knowledge with credible online auto repair resources.

Where to Get a New Mass Airflow Sensor for Your Vehicle

As mentioned above, the P0100 code can be often caused by a faulty mass airflow sensor. As such, it’s crucial you replace it as soon as possible to avoid further complications and issues when out on the road. Luckily, you can find high-quality sensors at competitive prices at with just a few clicks.

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To give you the best online shopping experience, we make it easy to sort our wide selection of sensors through our vehicle selector and filters. By entering your car’s year, make, and model into the selector, you’ll narrow down the catalog to compatible parts. The filter lets you check out the ones that match your preferred brand, price, and feature.

Not only that, but we guarantee our products’ quality because we source them exclusively from the most trusted manufacturers in the industry. So expect your replacement sensor to last as long as your vehicle’s lifespan.

Shop for a replacement mass airflow sensor at as soon as you can!

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About The Authors
Written By Automotive and Tech Writers

The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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Boa noite carissimos eu tenho ca uma Nissan sunny 2008 ela meda o erro p0100 ja troquei o sensor de volume de ar mesmo assim ela corta rotação e bai abaixo

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