The Honda P0102 code is displayed when the mass air flow sensor signal is lower than expected. This code can be caused by a faulty mass air flow sensor, a vacuum leak, or a malfunctioning engine control module.
The mass air flow sensor measures how much air enters the engine. The engine computer (PCM) uses the mass air flow signal to determine how much fuel to inject. If the mass air flow sensor signals are lower than expected, the code P0102 is set.
In Honda Civics, P0102 is one of the most common trouble codes. In this case, Mass Air Flow (MAF) circuit performance is low and is not operating according to its specifications.
The following sections will explain what this means and possible fixes. It should be a high priority to fix since a malfunctioning MAF sensor can seriously impact the vehicle’s performance.
What Does The P0102 Honda Code Mean?
The MAF sensor plays a very important role in the engine. Intake manifold volume and air density are measured.
Using this reading, the engine’s computer determines how much fuel the engine needs to run optimally. However, you may have some issues with your Honda when it doesn’t get the proper reading.
Mass Air Flow (MAF) sensors are placed in the intake air stream. A portion of the intake flow is measured to determine the intake flow rate. The Engine Control Module (ECM) supplies electric current to a hot film.
A certain amount of temperature control is provided by the ECM. Air flowing around the hot film reduces the heat it generates. There is a direct correlation between the amount of air and the amount of heat lost.
For the hot film to maintain its temperature, the ECM must supply more electric current as air flow increases. This current change allows the ECM to detect airflow.
An ECM will set a Diagnostic Trouble Code (DTC) if it detects a lower MAF Sensor Signal than that specified by the manufacturer.
Symptoms Of Honda P0102
No-start: The engine cranks but does not start.
Rough idle: The engine runs very roughly or stalls.
Misfire: The engine may backfire or knock during startup.
Consult your owner’s manual or take your vehicle to a mechanic if you are experiencing these symptoms.
What Are The Causes Of Honda P0102 Code?
Possible causes of this code include:
- The powertrain control module is faulty
- Absolute pressure sensor on manifold faulty
- The catalytic converter is clogged
- There is an electrical problem with the wiring or connector for the MAF sensor.
- The airflow sensor was installed incorrectly
- The vehicle has been modified with aftermarket components (such as a cold intake and a modified air filter)
- An air filter with a restricted air screen
- Filter that is dirty or restricted
- Intake air snorkel (boot) restricted or collapsed
- Leaks in the PCV system
- The wrong air filter was installed
- Inadequately closed air filter box
- Leaks in the vacuum
- Airflow sensor element blocked by debris
- Mass airflow sensor malfunctioning or contaminated
How To Fix The Code P0102?
It is common for the mass air flow sensor to be replaced if no other problems are found when a code P0102 is displayed. A poor-quality part can also cause the code P0102. The best sensor to use is an OEM one.
A mass air flow sensor costs between $70 and $350. The sensor can be easily replaced. After driving for a while, the code P0102 will disappear if the problem is fixed.
The code P0102 can also be caused by bad ground or a blown MAF sensor fuse. This is why the reference voltage and ground of the mass air flow sensor must be checked at the connector.
It is necessary to compare the airflow sensor readings with the known good sensor or with the readings from another car of the same model using the scan tool at different RPMs.
There may be cracks, tears, loose clamps, or improper connections in the snorkel connecting the mass air flow sensor to the engine intake. Check the snorkel for these signs.
A loose terminal, corrosion, or damage should be checked on the connector and wiring at the mass airflow. If the air filter is dirty, ripped, or does not fit properly, it needs to be replaced.
Mass airflow sensors need to be checked for contamination or obstructions. Cleaning the sensor element may help if it is dirty. However, it is important to clean the element carefully because it is very delicate.
Diagnosing MAF Sensor On Honda For P0102 Code
It is common for the MAF sensor to become so covered in grime over time that it will no longer give an accurate reading. It is possible to clean them, but you should not use a wire brush since it is easy to mess them up.
You may very well have a clogged catalytic converter if you get P0102 and a noticeable power loss at speed in your Civic.
Wiring Of The MAF Sensor
The MAF sensor should be checked for any open circuits or shorts around it. Check the wiring harness for obvious damage. You can test the wiring with a multimeter if you don’t see any.
Leak In The Intake Manifold/Vacuum Line
In the case of a leak in the intake manifold, the MAF sensor will be unable to provide an accurate reading. Therefore, the P0102 error will be thrown without knowing how much air is entering the engine.
Does A Dirty Air Filter Cause The Code P0102?
There will be a problem if the air filter is very dirty and restricts air flow to the point that it causes the engine to overheat. A crack, tear, loose clamp, or improper connection should be checked on the snorkel between the mass air flow sensor and the engine intake.
Is P0102 Caused By A Clogged Catalytic Converter?
In fact, yes. Lack of power at higher RPMs is one of the symptoms of a clogged catalytic converter. As a result, it is possible for the car to start and run at idle but bog down as soon as the engine is revved.
Can You Check If Your Catalytic Converter Is Clogged?
An exhaust back pressure test must be performed if it is suspected that a catalytic converter is clogged.
How Much Does It Cost To Diagnose Honda Code P0102?
An hour of labor is required to diagnose the Honda P0102 error code. Locations, the vehicle makes and models, and even the engine type determines how long it takes for an auto repair to diagnose a vehicle and how much it costs.
An hourly rate of $75 to $150 is typical at most auto repair shops. If you have the shop perform the repairs for you, most shops will apply the diagnosis fee to the repairs. The shop will then be able to give you an accurate estimate for the repairs needed to fix the P0102 error code.
MAF sensors are likely to be the problem, but you should test them before replacing them. There are two reasons why this is important. Their first disadvantage is their high price. Secondly, testing it with a multimeter only takes a few minutes.
Changing the air filter and cleaning the Mass Air Flow Sensor with low compressed air or Mass Air Flow Sensor Cleaner should be done before replacing the Mass Air Flow Sensor (MAF). After resetting the code, you should drive the vehicle. If the code returns, the MAF Sensor must be replaced.