P0102 OBD2 Trouble Code ✔️Dirty Air Filter or Damaged MAF Wiring

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P0102 OBD2 Trouble Code


Meaning of P0102 Generic OBD2 Code

The technical definition of P0102 code is: Mass or Volume Air Flow Circuit Low Input

This trouble code is closely related or usually associated with other codes related to faults with the MAF sensor in the engine. This includes P0100, P0101, and P0103.

Pro Tip
This P0102 OBD2 Trouble Code means you need to check your air filter, MAF sensor and MAF wiring for loose grounds or damaged wires.

The P0102 OBD-II code means the sensor range voltage is lower than normal values. This leads to problems with engine performance and drivability. Since the ECU is not reading the correct MAF sensor values due to a low voltage reading, the check engine light is triggered to warn you of the condition.

Troubleshooting this DTC can get a little tricky! ScannerDanner does a great job showing how to check your wiring, power and ground and ***SPOILER*** eventually found a ground wire that had been disconnected! 

What are the causes of P0102 OBD-II code?

When we break down this generic fault code we see that it’s got something to do with the Fuel/Air mixture specifically triggering the Malfunction Indicator Light (MIL). In this case, the Mass Airflow (MAF) sensor, filters, and wiring is where we’ll be focusing our attention.

 P0102 Mass or Volume Air Flow Circuit Low Input  

The first letter of the fault code will indicate the family. The first digit in the error code will signify if the code is Generic or Manufacturer Specific. The second number means specific areas (Fuel/Air, Ignition, Auxiliary, Engine Idle, Transmission, etc). The third and fourth numbers pinpoint help pinpoint the problem:

  • P = Powertrain
  • 0 = Generic fault
  • 0, 1, and 2 = Air/fuel mixture
  • 02 = Airflow issues (usually a clogged filter or bad ground)


Low voltage readings in the MAF sensor can be caused by a variety of faults. The primary reason for a P0102 code is restricted airflow. This situation is caused by a dirty or clogged air filter. Upon stepping on the gas, the engine needs to ingest a lot of air. If the air filter is dirty, there won’t be enough air rushing inside the intake plenum, which also means the MAF sensor is detecting a false or low voltage reading.

Pro Tip
The three most common causes for this code are:

  • Dirty air filter
  • Malfunctioned or dirty MAF sensor
  • Broken wiring (usually a bad ground)


The generic fault code can also be caused by a dirty MAF sensor element, which is common in older model cars and trucks. The same holds true if the vehicle is constantly driven in extremely dusty environments. If this is the case, the first remedy is to blast the MAF sensor with a commercially-available sensor cleaner. You should do this before ruling out a faulty MAF sensor.

Lastly, the P0102 code can also be triggered by broken or frayed wiring. If the check engine light remains ON after cleaning the MAF sensor, the next step is to inspect all MAF related wiring and electrical connectors to find the source of the fault code.

P0102 fault code DTC explained new

What are the symptoms of P0102 DTC?

The symptoms of P0102 is no different from other MAF sensor-related airflow trouble codes like P0101. This includes rough idling, black smoke in the exhaust, and poor engine performance. In extreme cases, the engine will refuse to start. If it does start, it may die down immediately after starting.

Most common symptoms are: 

  • Check Engine Light (MIL) illuminated
  • Erratic engine RPMs
  • Stalling

In some cases, the motor will run smoothly with slight hint of roughness. Of course, all these symptoms are accompanied by a check engine light (MIL) in the console.

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P0101, P0102, P0113 are common to see if you have MAF or air intake issues!

How much does it cost to fix P0102 fault code?

In order to stand a chance of saving money, the first step is check the MAF sensor and all related wiring.

If the P0102 code is initiated by faulty wiring or a dirty sensor, you can expect to spend no more than $30 to $50.

However, if the problem is caused by a faulty or bad MAF sensor, you can easily spend upwards of $100 for parts and labor.

This is the reason why it is important to follow the correct procedures in diagnosing a P0102 OBD2 Trouble Code. Before deciding to purchase a new MAF sensor, make sure the problem is not caused by neglected maintenance such as a dirty filter/sensor or bad wiring .


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