P0102 Code: Meaning, Symptoms, Causes (& How to Fix it)

The engine consists of multiple parts and sensors. Whenever any of these sensors go bad, your powertrain control module (PCM) triggers a code. Your Mass Airflow (MAF) sensor plays a vital role in the efficient working of the engine. As your PCM notices any problem with the signal coming from the MAF sensor, it triggers the P0102 code. This article deeply explains the P0102 code meaning, symptoms, and causes.

P0102 Code Definition

P0102 code stands for “Mass Airflow (MAF) Circuit Low Voltage Input.”

What does the P0102 Code Mean?

The P0102 code indicates that your powertrain control module (PCM) has detected that the incoming signal from the MAF sensor is lower than the specified limit. 

P0102 Code

The MAF sensor is used to measure the volume and density of the air entering the IC engine.

In various vehicles, the density of the air changes with the forced induction, altitude, and ambient temperature. That’s why proper working MAF sensors are vital to determine the amount of intake air in every cylinder.

The PCM of your vehicle uses the MAF sensor data to make fuel control decisions. Your powertrain control module triggers the P0102 code when it detects that the signal coming from the MAF sensor is lower than the specified limit for a specific period.

Symptoms of P0102 Code

As your PCM triggers the P0102 code, your vehicle produces one or more of the below-given symptoms:  

Causes of P0102 Code

The P0102 engine code is triggered due to one or more of the following causes:

  • Dirty MAF sensor
  • Loose connections
  • Damaged or corroded MAF connectors and wiring
  • Faulty air filter
  • Damaged wirings of the sensor
  • Faulty sensor
  • Carbon deposits on the MAF sensor screen
  • Vacuum leaks

Read More: Bad MAF Sensor Symptoms and Causes

How to diagnose the P0102 Code

Follow the below-given steps to diagnose or fix the P0102 trouble code:

  1. Use an OBD2 scanner to ensure the existence of the P0102.
  2. If this code is present, it is necessary to determine the main issue.
  3. Properly check the condition of the electrical connector, wiring, sensor, and air cleaners.
  4. Inspect your engine’s intake tract for leaks. Loose clamps and cracked plastic boots may affect the performance of your intake system.
  5. Locate the air filter housing and open it to examine the condition of the filter elements. If the air filter is damaged, contaminated, or dirty, replace it with a new one.
  6. Inspect the physical condition of the MAF sensor. The body of the sensor must be free from contaminants. If it is dirty, you need to clean it with an approved cleaning solution.
  7. Clear the trouble codes and perform a test drive. If the P0102 code is still there, view the relevant live feed data using a scan tool.
  8. Check the voltage of your MAF sensor by using a scan tool. If the voltage of the sensor is not according to the manufacturer’s specifications, you need to replace it.
  9. After replacing the sensor, again clear the code and take your car for a test drive. If the P0102 code again returns, you should contact a mechanic.

Common P0102 Diagnosis Mistakes 

  1. Overlooking the other stored trouble codes.
  2. Ignoring the visual inspection of the MAF sensor
  3. Changing the mass airflow sensor without first checking the wiring and air filter.
  4. Changing the MAF sensor without replacing or cleaning the air filter.
  5. Replacing the unnecessary parts.

How serious is the P0102 code?

The P0102 code is not a serious trouble code. This code does not stop your vehicle from moving.

In some cases, a faulty MAF sensor may cause poor fuel economy, choppy driving, and hard starting issues. Therefore, it is recommended to fix this code as soon as possible.

Infrequently, if your car is not facing any problem with this code, just reset the trouble code and test again to see if the check engine light illuminates and the code return. Typically, if the check engine light comes on instantly after starting, use an OBD-II to rest the code, and your vehicle will run normally.

What repairs can fix the P0102 code?

The following repairs can fix the P0102 code:

  • Clear the code and perform a test drive at normal speed
  • Fix the other stored codes
  • Repair the damaged connectors and wires
  • Clean the dirty MAF sensor
  • Repair or replace the damaged MAF sensor
  • Repair the vacuum leaks
  • Clean or replace the dirty or damaged air filter
  • Replace the PCM if needed.

P0102 Code Repair Cost

The repair or fixing cost of the P0102 code varies according to the vehicle model, labor cost, and repair cost of the relevant part. To fix or repair the P0102 code, you may need one or more of the following repairs:

MAF sensor replacement$90 to $400
Air filter replacement$15 to $30

FAQ Section

Can a dirty air filter cause a P0102 code?

Yes, a dirty or damaged air filter is a major cause of the P0102 code. The dirty air filter restricts the airflow to the intake manifold of your engine. As the vehicle driver presses the gas pedal, the engine has to draw in more air-fuel mixture. If your air filter is clogged, it will not draw enough air into the intake chamber as the engine needs. This allows the MAF to measure low voltages or wrong readings due to that your PCM will trigger the P0102.

Can I drive with a P0102 code?

Yes, you can drive with trouble code P0102. This trouble code will not cause any serious problems for the car and driver or any driving problems. However, you may face many other issues, such as poor fuel economy, illuminated check engine light, and poor engine performance.

How do I reset my MAF sensor?

  1. Remove the damaged MAF sensor and replace it with the new sensor.
  2. Before connecting the sensor with its harness, disconnect the battery from the ground cable.
  3. Leave it like that for about 11 minutes.
  4. Now, your complete system will be reset.

Can a vacuum leak cause the P0102 code?

Intake and vacuum leaks in the area after the mass airflow sensor can lead to a divergence between the mass airflow sensor reading and the real amount of air entering the engine. Therefore, a vacuum leak usually triggers a P0102 code.

Will a car run without a MAF sensor?

Without the correct signal from the MAF sensor, the Powertrain Control Module (PCM), which controls the transmission, engine, and other systems in your vehicle, doesn’t know how much fuel your engine requires. This may cause the engine to run too rich (too much fuel) or too lean (not enough fuel).

Where is the MAF sensor located?

The MAF sensor is usually located between the engine’s intake manifold and the air filter.

Read More
  1. P0068 Code Symptoms and Causes
  2. P0017 Code Symptoms and Causes
  3. Different types of Engines
  4. Causes of Check Engine Light Illumination 
  5. P0053 Code Symptoms and Causes
  6. P1148 Code Symptoms and Causes 
  7. How to Flush the Engine

Leave a Comment