P0103 OBD-II Trouble Code: Mass Airflow (MAF) Circuit High Air Flow and High Voltage Output

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0103 code

P0103 is a diagnostic trouble code (DTC) for "Mass Airflow (MAF) Circuit High Air Flow and High Voltage Output". 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 P0103 DIAGNOSTIC Get a fair and transparent estimate upfront

P0103 Trouble code definition

Mass Airflow (MAF) Circuit High Air Flow and High Voltage Output

  • The Code P0103 code is often associated with a P0100, P0101, P0102 and P0104 codes which are closely related.

What the P0103 code means

P0103 is the code for a problem with the Mass Airflow (MAF) Sensor having a high voltage output to the Engine Control Unit (ECU).

What causes the P0103 code?

The MAF Sensor high voltage output to the ECU may have several causes:

  • The source of the problem is the sensor voltage output is higher than normal or required by the ECU to function with other sensor signals.

  • The wiring or MAF sensor may be too close to higher voltage consumption components, alternators, ignition wires, etc. causing inaccurate output signals.

  • The air intake system from the air filter assembly may have a large leak like a bad vacuum hose, air intake hose, loose hose clamps or other intake leak before the MAF sensor.

  • MAF sensors must operate within specific ranges to send correct signals for the ECU to adjust correctly and in conjunction with other sensors for proper engine operation.

What are the symptoms of the P0103 code?

  • P0103 code will be normally preceded by the Check Engine Light coming on the dashboard display.

  • Generally, the vehicle runs well enough to drive. The engine often operates near normally but it may run slightly erratically, have less power, back fire and idle inconsistently higher than normal.

  • If the engine runs poorly, the situation requires attention as soon as possible or internal engine damage could occur.

How does a mechanic diagnose the P0103 code?

  • P0103 is diagnosed with a test with an OBD- II scanner. The OBD-II code should be reset and then road test the vehicle to see if the Check Engine Light and code comes back. He can observe this by watching it live on his scanner while driving. If the code comes back, then the mechanic will need to do a close visual inspection to determine if any electrical connector, wiring, sensor, air cleaner, intake or vacuum hoses, loose hose clamps, and MAF need repair or replacement.

  • If no problems are noted, then the next step is to have the mechanic do a circuit test with a multimeter that has a digital display to show sampling rate and sensor range readings to determine if the MAF sensor output is really too high.

Common mistakes when diagnosing the P0103 code

Diagnostic errors are largely due to not following the proper procedure:

  • First, follow the test procedure for inspecting the connector, wiring and sensor. Do not buy a MAF sensor unless the other tests indicate no problem.

  • Before buying a MAF sensor, try cleaning it with a specialized spray cleaner made for MAF sensors such as CRC 05110 as these often get considerable carbon build up from the emission system, especially at idle.

  • The air intake system may have very simple causes like loose clamps, air hoses or vacuum lines, so a close inspection is necessary before buying an expensive MAF unit.

How serious is the P0103 code?

  • The P0103 code generally will not prevent the car from driving unless the leak is massive.

  • Take the car to a qualified technician check it out as soon as possible.

  • The MAF sensor issue can cause excessive fuel consumption, smoking, rough operation and difficulty starting in certain circumstances. Continued driving could cause internal engine damage.

  • Often times, if the Check Engine 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 P0103 code?

The most common potential repairs for the P0103 code are as follows:

  • Recheck code with a scanner. Reset the fault codes and perform a road test.

  • If the P0103 code comes back, then follow the order of the test procedure.

  • Inspect the electrical connector to ensure it is attached correctly. Disconnect it and then reinstall to ensure fresh and positive electrical connection.

  • Carefully inspect for wiring being frayed, damaged or broken on the connector. Repair or replace as necessary before further testing.

  • Check for vacuum leaks, loose hoses, bad fittings, and clamps on the intake, especially on older cars. Old components can get hard and crack.

Additional comments for consideration regarding the P0103 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 Check Engine 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 P0103 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
P0103
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0103 code.

SCHEDULE P0103 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

5,626

Rating Summary
5,199
206
50
34
137
5,199
206
50
34
137

Robert

11 years of experience
104 reviews
Robert
11 years of experience
Nissan Quest - Check Engine Light is on - Alexandria, Virginia
Punctual. Knowledgeable. Professional. Empathic, went the extra mile to explain in lay words the mechanical jargon. Excellent manners and customer service oriented. Client’s best interest and safety was always his top priority. From now on your company has in me a client for life. Thanks Robert!!!! 

Chris

21 years of experience
1861 reviews
Chris
21 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Ladera Ranch, California
Chris was friendly, professional and knowledgeable. He got to the point of my concerns, explained what he was finding on his system and gave me his recommendations. I fully appreciate him taking the time to explain everything and a bit of history on my vehicle. Thanks again Chris.

Michael

15 years of experience
574 reviews
Michael
15 years of experience
Hyundai Accent - Check Engine Light is on - Marietta, Georgia
I had a great experience with Michael. He's extremely professional, friendly, and understands his craft. Highly recommended.

Chris

15 years of experience
274 reviews
Chris
15 years of experience
Dodge Durango - Check Engine Light is on - San Diego, California
Showed up early, was a friendly dude, kept me informed via text, did clean work and finished early. Would hire again.


More related articles

P0097 OBD-II Trouble Code: Intake Air Temperature Sensor 2 Circuit Low Input
P0097 P0097 code definition Intake Air Temperature Sensor 2 Circuit Low Input What the P0097 code means P0097 is the OBD-II generic code indicating the engine control module (ECM) has determined that the intake air temperature sensor 2 (IAT2) input...
P0336 OBD-II Trouble Code: Crankshaft Position Sensor A Circuit Range/Performance
P0336 code definition Crankshaft Position Sensor A Circuit Range/Performance What the P0336 code means When the P0336 diagnostic trouble code has been...
P0711 OBD-II Trouble Code: Transmission Fluid Temperature Sensor Circuit Range/Performance
P0711 P0711 code definition The P0711 code is a generic powertrain code related to the transmission, including sensor failures and pressure faults. In this case, it means that the engine control module (ECM) or powertrain control module (PCM) has detected...

Related questions

Check engine and cruise control lights come on simultaneously

Hello. When the Check Engine Light comes on, it disables the cruise control. I would need to know the code to be able to tell what may be going on. I typically start by scanning the computer for codes to...

check engine light will not go off

I would try to clear the code first by disconnecting the battery. Make sure you have the radio reset code. Leave the battery disconnected for at least 10 minutes. Reconnect the battery and enter radio code. The Check Engine Light...

P0741 OBD code

Hello, thanks for writing in about your Volkswagen Passat. Trouble code P0741 indicates: Torque Converter Clutch Circuit Performance or Stuck Off. If you need help with getting this fixed, consider YourMechanic, as one of our mobile technicians can come to...

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