P0101 OBD-II Trouble Code: Mass Airflow (MAF) Circuit Operating Range or Performance Problem

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0101 code

P0101 is a diagnostic trouble code (DTC) for "Mass Airflow (MAF) Circuit Operating Range or Performance Problem". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0101 DIAGNOSTIC Get a fair and transparent estimate upfront

P0101 code definition

Mass Airflow (MAF) Circuit Operating Range or Performance Problem

  • The P0101 code can often be associated with a P0100, P0102, P0103 and P0104 codes.

What the P0101 code means

P0101 is the general code for a problem with the Mass Airflow Sensor (MAS) operating range and/or an engine performance issue.

What causes the P0101 code?

  • The most common source of the problem is the sensor range of the MAF sensor being outside of the normal operating range. This provides input to the Engine Control Unit (ECU) giving outputs that are beyond the programming for the engine management.

  • The MAF sensor is not operating within the performance range programmed into the ECU related to the data sampling rate. This causes conflicts in the engine management system leading to poor performance and erratic operation.

  • The wiring or MAF sensor may be too close to higher voltage consuming components. This includes alternators, ignition wires, etc. which can cause interference in the output signal to the ECU.

  • A vacuum leak can also cause a fault reading and can lead to other problems that may indicate several codes at the same time.

  • MAF sensors must operate within specific ranges to be able to send correct signals to the ECU. This will make sure it is adjusted correctly for proper engine operation.

What are the symptoms of the P0101 code?

  • P0101 code will be generally preceded by the engine warning light coming on the dashboard display.

  • The engine runs close to normal but it may run slightly erratically, have less power and idle inconsistently along with poor fuel economy.

How does a mechanic diagnose the P0101 code?

  • Retrieves the P0101 code with an OBD- II scanner.

  • Inspects the engine for obvious problems, then resets the OBD- II fault codes and road tests the vehicle to see if the code comes back.

If the P0101 code comes back, the mechanic follows the test procedure prescribed for that code:

  • Inspects the electrical connector to insure it is securely attached.

  • Disconnects it and reinstalls it to insure fresh and clean electrical connection

  • Insures no high voltage sources near the MAF or it's wiring

Common mistakes when diagnosing the P0101 code

  • Buying a MAF sensor without being certain that the sensor output has been confirmed to be out of range.

  • Not cleaning the MAF sensor before buying. Try cleaning it with a specialized spray cleaner made for MAF sensors, like CRC 05110, as these often get considerable carbon build up from the emission system, especially at idle.

  • Not catching vacuum leaks will show the sensor giving a higher than normal flow of air through the MAF sensor due to excessive air coming through the leak.

How serious is the P0101 code?

  • The P0101 code will not prevent the car from driving but it is advisable to check it out as soon as possible.

  • The MAF sensor issue can cause excessive fuel consumption, rough operation and difficulty starting in certain circumstances. Sustained driving can cause internal problems in the engine.

  • If the engine warning light came on immediately at start up, the OBD- II system can be reset and the vehicle will operate normally.

What repairs can fix the P0101 code?

The most common potential repairs to address the P0101 code are as follows:

  • Verify the code with a scanner. Reset the fault codes and perform a road test using a live data scanner.

  • If the P0101 code comes back, then follow the test procedure prescribed for that code.

  • Inspect the electrical connector to insure it is securely attached. Disconnect it and then reinstall to insure fresh and clean electrical connection. Insure no high voltage sources are near the MAF or its wiring.

  • Visually inspect for wiring being frayed or broken on the connector. Repair or replace as necessary.

  • Check for vacuum leaks on the intake, especially on older cars which can have cracks due to age of the materials.

Additional comments for consideration regarding the P0101 code

  • Many vehicles with mileage over 100,000 have momentary sensor problems that usually occur during start up or prolonged stress situations on the drive train.

  • If the engine warning light comes on and the vehicle seems to be operating normally, the OBD-II system can be reset using the scanner and the problem may not reoccur. This is why it is important to verify the fault and reset it before doing any repairs.

Need help with a P0101 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0101
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0101 code.

SCHEDULE P0101 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,395

Rating Summary
4,978
202
50
30
135
4,978
202
50
30
135

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
Jeep Grand Cherokee - Check Engine Light is on - Carmichael, California
Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

Michael

37 years of experience
113 reviews
Michael
37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
Michael was punctual and courteous. He knows what he’s doing and I would absolutely recommend him to anyone.

Anthony

6 years of experience
18 reviews
Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

Breck

19 years of experience
613 reviews
Breck
19 years of experience
Ram 1500 - Check Engine Light is on - Houston, Texas
Breck did a great job working on my truck. Showed up on time, found any issues I had on my truck and explained everything to me so that I understood what was going on. Went above and beyond, definitely will book him for future appointments.


Related questions

My car has a mass air flow circuit range issue

Hello. P0101 is the trouble code for an issue with the MAF sensor circuit range. This code is set when the computer detects an issue with the vehicle's MAF sensor signal. If the MAF sensor has been replaced, then it...

P0101

Hello. P0101 is the code for an issue with the MAF sensor signal or circuit. P0101 indicates that the computer has detected the MAF signal has fallen out of the acceptable range. This is usually caused by a faulty MAF...

My yukon is running like nthere is something terribly teribly wrong

The mass air flow sensor measures the speed of the air going into the engine. The P0101 code could be an electrical issue. The PO449 code is related to fuel tank emissions. Codes give you the area of a fault...

More related articles

P0220 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch Circuit "B" Malfunction
P0220 P0220 trouble code definition Throttle/pedal position sensor/switch circuit B malfunction. What the P0220 code means The P0220 code means that the vehicle’s powertrain control module has detected a voltage or resistance reading that is outside of specifications that were...
P2018 OBD-II Trouble Code: Throttle Actuator Control Module Performance
P2108 P2108 code definition Throttle actuator control module performance What the P2108 code means This trouble code indicates that the powertrain control module has detected a malfunction with the throttle body control motor or module. This code is only found...
P2552 OBD-II Trouble Code: Throttle/Fuel Inhibit Circuit
P2552 P2552 code definition A P2552 OBD-II trouble code indicates a problem with the throttle or fuel inhibitor circuit. This is a malfunction more commonly found in diesel-powered vehicles. This code is also associated with OBD-II trouble codes P2553, P2554,...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com