Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P1102 OBD-II Trouble Code: Mass Airflow Sensor in Range But Lower Than Expected

P1102 OBD-II Trouble Code: Mass Airflow Sensor in Range But Lower Than Expected

diagnostic check engine light

P1102 code definition

When the voltage coming from the Mass Air Flow (MAF) sensor to the Powertrain Control Module (PCM) is low but within range, a P1102 trouble code is stored. Other trouble codes related to this code include a P1100, P1101, P1103, and P1104 code.

What the P1102 code means

The MAF sensor communicates with the PCM using voltage. When this voltage registers as lower than normal, but still falls within the manufacturer's specified range, a P1102 trouble code is stored by the PCM and the check engine light illuminates.

What causes the P1102 code?

Some possible causes of a P1102 trouble code includes shorted wiring or a loose connection within the MAF sensor harness, an air leak in the vacuum system before or after the sensor, or a bad or dirty MAF sensor. A clogged MAF sensor screen can also cause the voltage from the MAF sensor to register as too low. In some cases, the problem is caused by a poor electrical connection with the MAF sensor circuit.

What are the symptoms of the P1102 code?

Some of the more common symptoms of a P1102 trouble code storage include an erratically running engine, less power when accelerating, and stalling while idling. Another problem caused by a P1102 trouble code is problems with the fuel mixture, which can lead to problems with the vehicle's engine.

How does a mechanic diagnose the P1102 code?

Diagnosing a P1102 trouble code requires the use of an advanced scanner and a digital volt/ohm meter by the mechanic. In addition, the mechanic should perform the following diagnostic steps:

  • Visually inspect the wiring, connectors, and components of the MAF sensor harness, looking for any damaged, loose, or faulty items.
  • Pull out the air filter to see if it needs replacing.
  • While the air filter is out, remove the MAF sensor carefully with a flat head screwdriver for cleaning.
  • Replace the MAF sensor and air filter. Clear the code and test the system to see if the code persists.
  • Download any freeze frame data and stored codes if the trouble code returns.
  • Perform a smoke test on the vacuum system and look for leaks, especially before and after the MAF sensor.
  • Connect the digital volt/ohm meter to the MAF sensor, testing the sensor's reference voltage and ground signal.
  • If the mechanic detects no voltage or ground signal, they should disconnect the PCM and other related modules before testing the sensors continuity with the battery ground. The mechanic should compare their findings to the manufacturer's specifications.
  • The mechanic should also test the continuity between the PCM and MAF sensor.
  • Finally, the mechanic should clear the P1102 trouble code and retest the system to see if the code is stored again.

Common mistakes when diagnosing the P1102 code

Mechanics often make the mistake of replacing the MAF sensor without trying to see if cleaning it with a CRC 05110 spray cleaner works first. Often, cleaning the sensor can lead to it operating properly and not require the expense of purchasing a replacement part. Also, the mechanic should try replacing the air filter before replacing the MAF sensor.

How serious is the P1102 code?

The problems often associated with the storage of a P1102 trouble code means that you should have the code diagnosed and fixed as soon as possible. In addition to the rough operation, stalling, and reduced fuel efficiency issues, allowing this code to continue without repairing can lead to internal engine damage over time.

What repairs can fix the P1102 code?

To repair a P1102 trouble code, the mechanic must perform the following steps:

  • The mechanic should first replace any faulty or damaged wiring, connectors, or components within the MAF sensor harness. The mechanic should also check the wiring and connectors to see if they are disconnected.
  • Replace the air filter if it is dirty.
  • Clean the MAF sensor using a CRC 05110 spray cleaner.
  • Repair any leaks within the vacuum system.
  • Replace the MAF sensor if further tests determine it is bad after the mechanic cleans it.
  • If for some reason the PCM tests as faulty, reprogram or replace the component. When replacing the PCM, it needs reprogramming.

Need help with a P1102 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: Died,then wouldn't crank for a few min then cranked and drive but cut out once in the way back home.

This may sound like a dumb question, but when was the last time you put gas in it? It may be possible that the fuel gauge sending unit is failing and giving you a false reading. It is also possible...

Q: Are Code Readers and Scan Tools Different?

There are differences and similarities between code readers and scan tools. With the advent of the vehicle on board diagnostic system (OBD) there have been many different makers of scan tools and code readers. The code readers were the first...

Q: Wont start sometimes

The problem may be from the fuel pump or regulator or one of the sensors. You should have a Check Engine Light that can be scanned and diagnosed to see what may be causing the problem. I recommend having a...