P0102 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P0102 – Mass Air Flow Circuit Low Input

P0102: What does it mean?

The Code P0102 indicates that the Mass Air Flow Sensor (MAF) is reporting inaccurate values.

The Mass Air Flow sensor is designed to measure the amount of air taken into the engine. The sensor calculates the airflow and reports to the Powertrain Control Module(PCM), and the PCM can determine the volume of fuel that enters the engine. It will help the engine to operate with high fuel efficiency with a proper ratio of air and fuel. 

When the Mass Air Flow is reporting an inaccurate value, the PCM will ignite the check engine light and report a Diagnostic Trouble Code P0102.

Severity: Low

The P0102 is not a big issue, but you should address it to prevent it from developing into a major issue.

Difficulty of diagnosis or repair: 3 out of 5

P0102 Possible Symptoms

Symptoms of code P0102 may include:

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

P0102: Possible Causes

There are many possible causes for the code P0102, including:

  • Dirty mass air filter
  • Faulty mass airflow sensor
  • Intake air leaks
  • Dirty mass airflow sensor
  • Mass airflow sensor harness is open or shorted
  • Mass airflow sensor circuit poor electrical connection

Possible Checks/Fixes you can do yourself:

  1. First, clear the code and go for several drive cycles to see if the code comes back. If the code is back and the check engine light is on, continue following the guide:
  2. Check the MAF air filter to see if there is obvious dirt or damage. Clean the air filter if there is heavy dirt, as it might be a simple fix for the problem. Also, 
  3. Replace the air filter if necessary. Check your owner’s manual to locate the MAF sensor for your specific car.
  4. Visually inspect all the Mass Air Filter Sensor wiring and connectors for open, shorted, broken or frayed parts. Clean them if you see heavy dirt around. Especially make sure that the wires between the Engine Control Module(ECM) are in a good state.
  5. Check the MAF to see if it’s dirty. Clean it with MAF Cleaner, which is sold everywhere. 
  6. Visually inspect the system for any obvious vacuum leak, especially on the intake manifold hose and fittings. Replace the hose if you see an obvious leak.
  7. If these steps don’t solve the code, you should take the vehicle to a mechanic for further diagnosis and inspection. They will use pro tools and complex checks to solve the problem.

How much is the cost to clear P0442?

For car code P0102, several repairs may apply, and the cost estimations are below:

  • MAP Cleaner: $10
  • Replace the MAF: $300