P0104 code ford

P0104 code ford DEFAULT

Error Code P0104: Mass Air Flow (MAF) Circuit Intermittent

Error Code P0104 is defined as MAF (Mass Airflow) Circuit Intermittent. Meaning, the electrical circuit of the MAF sensor produces inconsistent, erratic or irregularly high output voltage signal to the ECU (engine control unit).

This error code is also associated with P0100, P0101, P0103 and P0104.

Definition

MAF sensor is placed in the intake air stream, and its job is to measure the air that enters the, engine while the Engine Control Module uses this information to determine and regulate the correct amount of fuel and ignition timing.

Error Code P0104is triggered when the MAF sensor is malfunctioning or making incorrect airflow readings, as this means a problem with the MAF sensor or circuit.

Common Symptoms

The giveaway symptom for this code is of course, the illumination of the Check Engine light. In terms of drivability symptoms, they’re pretty tricky to spot, and you need to put close attention to the vehicle’s performance, as the engine will run close to normal, and only show slightly erratic performance. Other symptoms include:

  • Less power
  • Inconsistent idle higher than normal
  • Engine back fire
  • Engine hesitates or die
  • Poor fuel mileage

Possible Causes

The most common source of this problem lies in the sensor voltage, when it’s not sending the right voltage output as required by the ECU. And the most basic problem that leads to this trouble code is to inconsistent high air flow from the MAF sensor’s air cleaner. Other causes for erratic high voltage output of MAF sensor can be caused by several causes, such as:

  • Broken, damaged or frayed wire of MAF sensor circuit
  • Corroded or loose electrical terminals in the MAF sensor circuit
  • Air leakage in the intake system
  • Faulty MAF sensor
  • Split or torn MAF sensor intake boot

Also, different makes and models of vehicle will have different leading causes for this trouble code.

How to Check

Diagnosing this code obviously start with the use of an OBD-II scanner. Qualified technicians reset the sensor’s fault codes before taking the vehicle for a road test to see if the code comes back. The technician can observe this through the live data of the scanner while driving.

If the code comes back, the mechanic will then proceed to carefully inspect the components connected to the MAF sensor, from its electrical components, air cleaner, sensor, vacuum hoses, intake, loose hose clamps, and various MAF issues.

If there are no problems in those areas, then mechanic will conduct a circuit test using a multimeter with a display showing the sampling rate and the readings for the sensor range voltage. This is to determine whether output of the MAF sensor is truly erratically high.

How to Fix

  1. As said in the diagnosis, mechanics will conduct a thorough inspection of the wires and connectors for the MAF sensor. To refresh the connection, simply disconnect and then reinstall the connector.
  2. Look for any broken or frayed connectors or wires, repair or replace as needed.
  3. Check the air intake system and look for signs of loose hoses, vacuum leaks and clamps on intake, especially for older vehicles.
  4. Check the MAF sensor’s voltage. You may need to refer to the repair manual for this one to know the specific information for your vehicle.
  5. If you can’t seem to find any other issues causing the problem, then you might need to replace the MAF sensor.

This error code doesn’t really prevent the vehicle from running, unless there’s an extremely large leakage. The MAF sensor however, can cause excessive fuel consumption, difficulty starting and rough operation. Thus, it is important to solve this error code right away, as continued driving with this problem will lead to internal engine damage.

Also, there are cases when the Check Engine light lights up at startup, the OBD-II system can actually be reset to and the vehicle will run normally.

Sours: https://autoservicecosts.com/obd2-codes/p0104/

P0104 OBD-II Trouble Code: Mass Airflow (MAF) Electrical Circuit Erratic and Irregular Output

P0104 Trouble code definition

Mass Airflow (MAF) Electrical Circuit Erratic and Irregular Output

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

What the P0104 code means

P0104 is the code for issues with the Mass Airflow (MAF) Sensor having inconsistent, erratic or irregular high output voltage/signal to the Engine Control Unit (ECU).

What causes the P0104 code?

The MAF Sensor having erratically high voltage output problems may have several causes:

  • The source of the problem is the sensor voltage is not sending correct voltage output required by the ECU.

  • The most basic problem is too inconsistent high air flow from the air cleaner the MAF sensor.

  • The wiring or MAF sensor may be bad or have a bad electrical connection. It also could be too close to higher voltage consumption components, especially alternators, ignition wires, etc. which would give incorrect signal interference.

  • The air intake system may have a large leak like a bad vacuum hose, air intake hose loose, loose hose clamps or other intake leak before the MAF sensor. The leaks can be cracks that open and close depending on engine speed and loading.

  • MAF sensors must operate within specific ranges to send correct signals for the ECU to adjust correctly for proper engine operation that are compatible with other sensor outputs.

What are the symptoms of the P0104 code?

  • P0104 code will be generally preceded by the Check Engine Light coming on the dashboard display.

  • Normally, the vehicle runs well enough to drive but does require attention.The engine runs close to normal but it may run slightly erratically, have less power, back fire and idle inconsistently higher than normal. Continued driving of the vehicle can cause internal engine damage.

How does a mechanic diagnose the P0104 code?

  • P0104 is diagnosed with an OBD- II scanner. A qualified technician should then reset the OBD- II fault codes and road test the vehicle to see if the code and engine warning light return. He can observe this by watching live data on his scanner while driving. If the code comes back, then the mechanic will need to do a careful inspection to determine if any electrical connector, wiring, sensor, air cleaner, intake and vacuum hoses, loose hose clamps and MAF issues.

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

Common mistakes when diagnosing the P0104 code

Diagnostic errors are largely by not following the correct procedure. First, follow the test procedure for the connector, wiring and sensor.

  • Do not buy a MAF sensor unless the other tests indicate no problem and is determined to be bad.

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

  • The air intake system may have 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 P0104 code?

  • The P0104 code will not prevent the car from driving unless the leak is very large.

  • The MAF sensor problem can cause excessive fuel consumption, rough operation and difficulty starting in certain circumstances, or even engine damage if the vehicle is continued to be driven, but it is best to diagnose the problem more accurately.

  • Occasionally, the code can be reset and the vehicle will function normally without the engine warning light or the code returning.

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

What repairs can fix the P0104 code?

The most common repairs to address the P0104 code are as follows:

  • Verify the code with a scanner. Reset the fault codes with the OBD-II Scanner and perform a road test.

  • If the P0104 code and/or engine warning light comes back, then follow the test procedure.

  • Inspect the electrical connector to insure it is attached. Disconnect it and then reinstall to make sure there is a fresh electrical connection.

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

  • Check the air intake system for vacuum leaks, loose hoses and clamps on the intake, especially on older cars.

  • Replace the MAF sensor if no other issues are found.

Additional comments for consideration regarding the P0104 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 P0104 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.

This article originally appeared on YourMechanic.com as P0104 OBD-II Trouble Code: Mass Airflow (MAF) Electrical Circuit Erratic and Irregular Output.


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P0104 Code: Mass Air Flow (MAF) “A” Circuit Intermittent / Erratic

Reading Time: 3minutes

Your vehicle is equipped with various sensors that are crucial to its operation. A mass air flow (MAF) sensor, for example, is one of the key components of the engine’s fuel injection system. It measures the amount of air entering the engine so that the powertrain control module (PCM) would know how much fuel is needed by the engine. 

P0104 is an engine trouble code related to a possible issue in your vehicle’s MAF sensor circuit. The information below might help you understand this code better. 

What Does the P0104 Code Mean?

Diagnostic trouble code (DTC) P0104 stands for “Mass Air Flow (MAF) “A” Circuit Intermittent/Erratic.” It may be logged once the PCM perceives that the MAF sensor frequency signal is not within the expected range based on the calculated MAF value. 

closeup of mass air flow sensor of car at air filter housing

A mass air flow sensor monitors the amount of air entering the engine. The PCM collects data from this sensor to help determine the amount of fuel needed by the engine at a given time. The right air-to-fuel ratio is essential to achieving optimal engine performance. 

This sensor is usually installed in the engine air intake tract downstream from the air filter. It measures the amount of air entering the engine by calculating its volume and density. A MAF sensor only measures a portion of intake air and uses this value to estimate the total volume and density of air entering your engine. 

The data is sent to the PCM through a voltage signal. Once the PCM perceives an erratic voltage output from the MAF sensor circuit, it will trigger the code. 

P0104 is similar to other MAF circuit trouble codes, such as P0100, P0101, P0102, and P0103. 

Note: The definition of code P0104 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

CarParts.com

Vehicles that are prone to code P0104 include various models of Peugeot, Ford, Toyota, Chevrolet, and Mercedes Benz.

What are the Possible Causes of the P0104 Code?

Here are the possible triggers of the P0104 code: 

  • Failed/dirty MAF sensor 
  • Intake air leaks
  • MAF sensor wiring/harness issues 
  • Issues with the PCM, such as software in need of an update

What are the Common Symptoms of a P0104 Code? 

The symptoms of code P0104 may include the following: 

  • Illuminated check engine light
  • Engine stalling 
  • Hard starting
  • Rough running engine 
  • Black smoke from tailpipe
  • Lack of acceleration 

You may also experience other drivability symptoms due to this trouble code. However, in some cases, your vehicle may not exhibit any symptoms at all. 

smoke from exhaust of car when engine starts

How to Diagnose the P0104 Code 

It’s tricky to diagnose a P0104 code. Engine misfire and oxygen sensor codes may also be logged together with this code, so it may be very challenging to diagnose the root cause of the problem. 

If you’re not an experienced automotive DIYer, it is best to take your vehicle to an auto repair shop for proper diagnosis and repair. However, if you prefer to diagnose this code yourself, you may consult vehicle-specific repair manuals and/or online repair databases. These resources will contain the information you need to properly diagnose your vehicle. 

How to Fix the P0104 Code 

Although P0104 is a generic trouble code, there is no one solution that would work for all makes and models. Remember that modern cars are structured differently per manufacturer. Repair procedures for this code may vary depending on the vehicle. For instance, the confirmed fixes of a code P0104 on a Toyota may not work for a code P0104 on a Mercedes.  

If you’d like to resolve the code yourself, it would be best to consult vehicle-specific repair manuals and/or subscribe to an online repair database. These resources contain specific instructions that can help you address vehicle issues like faulty sensors. 

However, if you’re not well-versed in auto repair, you can always bring your vehicle to an auto repair shop for proper diagnosis and repair.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

Keep Reading: Related Posts

File Under : OBD-II Trouble CodesTagged With : mass air flow sensor

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How to Clean Mass Air Flow Sensor-FORD Vehicles! Easy

Ford P0104 OBD-II Trouble Code Definition:

P0104 Mass Air Flow Sensor Throttle Angle and Speed

P0104 Ford OBD-II Trouble CodeDescription:

OBD Trouble Code P0104

Mass or Volume Air Flow Circuit Intermittent

What does the code mean? OBD-ii Code P0104 definition:
Basically this means that there is a problem with the Mass Air Flow High (MAF) sensor or circuit. A more technical description would be that the MAF is producing incorrect air flow readings.

Symptoms Sumptoms of OBD code P0104
You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes Causes of the OBD-II code P0104
The mass air flow (MAF) circuit is incomplete (broken / frayed wire, etc.) There is an air leak in the intake system

Solutions The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. Inspect for any air leaks near the MAF sensor. Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) Replace the MAF sensor.

Related Codes P0100 P0101 P0102 P0103

Sours: https://www.fordobdcode.com/p0104-ford

Code ford p0104

P0104 – Meaning, Causes, Symptoms, & Fixes

Code P0104 Definition

Mass Air Flow (MAF) Electrical Circuit Erratic and Irregular Output

What Does P0104 Mean?

The Mass Air Flow (MAF) sensor measures the amount of air entering the engine. When code P0104 is set, there is an inconsistent or irregular voltage output to the ECM, PCM, or ECU depending on your car type (check your owner’s manual for your specific car). Due to the inconsistent and irregular nature of this code diagnosis can be difficult.

What Are the Symptoms of Code P0104?

  • Check Engine Light
  • Lower fuel economy
  • Black smoke from the tailpipe
  • Rough operation
  • Stalling
  • Hard Start

What Is the Cause of Code P0104?

  • Dirty or damaged air filter (common cause)
  • Leaking vacuum hoses or intake gaskets
  • Debris covering MAF sensing element (common cause)
  • Faulty MAF
  • Faulty electrical connection to MAF sensor
  • Corroded/Damaged MAF circuit terminals

What Is the Severity of Code P0104? – Moderate  

The trouble code P0104 can cause the vehicle to have driveability issues and should be taken care of as soon as possible as the continuation of driving could cause other issues within the vehicle.

Code P0104 Common Diagnosis Mistakes

Replacing the Mass Air Flow (MAF) before checking for a faulty air filter or debris on MAF sensing element.

Tools Needed to Diagnose Code P0104:

    • FIXD
    • Spray bottle of water
    • Basic hand tools

How to Diagnose Code P0104:

Difficulty of Diagnosis: 3 out of 5

  1. Visually inspect wiring around Mass Air Flow (MAF) Sensor for any frayed, broken, corroded wires.
  2. Conduct a visual and audible inspection of the vacuum lines, and any intake connections to make sure there are no signs of disconnection or outside air leaks. (This includes the intake pipe between the throttle body and MAF)
  3. Listen for a hissing sound which can be a sign of a vacuum leak
  4. Spray water over intake area and listen for idle rpm stumble. If it goes down there is an intake leak. Concentrate the stream on different hoses and gaskets until you find your leak.
  5. Check your air filter and replace if needed.
  6. Clean your MAF sensor to make sure that there are no pieces in the system that do not belong. Check out this video for a visual step by step walk through.
  7. The quickest way to check if your Mass Air Flow (MAF) sensor is the problem is to disconnect your electrical harness while your car is running. Check your owner’s manual to locate the MAF sensor for your specific car.
  • NOTE: Make sure that all other parts of your vehicle have cooled down (6-8 hours inactive) before doing this test. Reference this video for visual reference. (doing this test will cause other MAF codes to populate. After this test clear these codes)
  • If your car’s engine shuts off, your MAF sensor is operating normally. If it does not shut off it means that your MAF sensor is not operating normally and should be replaced.
  • If these steps do not clear your Check Engine Light, replace the MAF and retest.

Estimated Cost of Repair

For error code P0104, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.

  • Mass Air Flow (MAF) $300-$400
  • Vacuum leak $100-$200
  • Wiring repair $100-$200
  • Air Filter $20
  • MAF Cleaning $100-$200 
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How to Fix P0104 Engine Code in 2 Minutes [1 DIY Method / Only $9.71]

P0104 FORD Code - Mass or Volume Air Flow 'A' Circuit Intermittent

AutoCodes - Ford - P0104 FORD

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What does this mean?

|P0104 FORD code possible causes

  • Faulty Mass Air Flow (MAF) Sensor
  • Intake air leaks
  • Dirty Mass Air Flow Sensor
  • Dirty Air Filter
  • Mass Air Flow Sensor harness is open or shorted
  • Mass Air Flow Sensor circuit poor electrical connection

|How do I fix the P0104 FORD code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0104 FORD code tech notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

|Cost of diagnosing the P0104 FORD code

Labor: 1.0

The cost of diagnosing the P0104 FORD code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0104 FORD code detected?

The ECM has detected an air flow signal that is outside the calibrated level.

|What are P0104 FORD code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine stall
  • Engine running rough
  • Excessive fuel consumption
  • Excessive smoke

|P0104 FORD code description

The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).
The temperature of the hot film is controlled by the ECMa certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECMmust supply more electric current to maintain the temperature of the hot film as air flow increases. The ECMdetects the air flow by means of this current change.
OBDII Code P0104 Ford - Mass or Volume Air Flow 'A' Circuit Intermittent - AutoCodes.com

|Need more information with the P0104 FORD code?

Need more information on how to fix the P0104 FORD code?
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|P0104 FORD code information for specific Ford models

|P0104 FORD code comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0104 Ford code? Have you replaced any parts?
Any information is appreciated. Thanks

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P0104 FORD Code - Mass or Volume Air Flow 'A' Circuit Intermittent

Engine-Codes - Ford - P0104 FORD

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3  What is this?

What does this mean?

|P0104 FORD code possible causes

  • Faulty Mass Air Flow (MAF) Sensor
  • Intake air leaks
  • Dirty Mass Air Flow Sensor
  • Dirty Air Filter
  • Mass Air Flow Sensor harness is open or shorted
  • Mass Air Flow Sensor circuit poor electrical connection

|How is the P0104 FORD code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What does this mean?

|P0104 FORD code tech notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

|What is the cost to diagnose the P0104 FORD code

Labor: 1.0

The cost to diagnose the P0104 FORD code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0104 FORD code detected?

The ECM has detected an air flow signal that is outside the calibrated level.

|What are P0104 FORD code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine stall
  • Engine running rough
  • Excessive fuel consumption
  • Excessive smoke

|What is P0104 FORD code meaning?

The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).
The temperature of the hot film is controlled by the ECMa certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECMmust supply more electric current to maintain the temperature of the hot film as air flow increases. The ECMdetects the air flow by means of this current change.

OBDII Code P0104 FORD - Mass or Volume Air Flow 'A' Circuit Intermittent - Engine-Codes.com

|Need more information with the P0104 FORD code?

Need more information on how to fix the P0104 FORD code?
Get Access to Factory Service Manuals

|P0104 FORD code information for specific Ford models

Repair Importance Level:3

 

1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:2

 

1=Easy 2=Moderate 3=Hard What is this?

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