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

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P1102 code

P1102 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor in Range But Lower Than Expected". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P1102 DIAGNOSTIC Get a fair and transparent estimate upfront

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.

P1102
trouble codes
OBD-II

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P1102 code.

SCHEDULE P1102 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,626

Rating Summary
5,199
206
50
34
137
5,199
206
50
34
137

Robert

11 years of experience
104 reviews
Robert
11 years of experience
Nissan Quest - Check Engine Light is on - Alexandria, Virginia
Punctual. Knowledgeable. Professional. Empathic, went the extra mile to explain in lay words the mechanical jargon. Excellent manners and customer service oriented. Client’s best interest and safety was always his top priority. From now on your company has in me a client for life. Thanks Robert!!!! 

Chris

21 years of experience
1861 reviews
Chris
21 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Ladera Ranch, California
Chris was friendly, professional and knowledgeable. He got to the point of my concerns, explained what he was finding on his system and gave me his recommendations. I fully appreciate him taking the time to explain everything and a bit of history on my vehicle. Thanks again Chris.

Michael

15 years of experience
574 reviews
Michael
15 years of experience
Hyundai Accent - Check Engine Light is on - Marietta, Georgia
I had a great experience with Michael. He's extremely professional, friendly, and understands his craft. Highly recommended.

Chris

15 years of experience
274 reviews
Chris
15 years of experience
Dodge Durango - Check Engine Light is on - San Diego, California
Showed up early, was a friendly dude, kept me informed via text, did clean work and finished early. Would hire again.


More related articles

P2137 OBD-II Trouble Code: A Camshaft Position Actuator Control Circuit Low Bank 2
What What the P2137 code means? P2137 is an OBD-II generic code for the engine control module (ECM) detecting the throttle pedal position sensors B and C voltages do not correlate to each other for return voltage to the ECM....
P2173 OBD-II Trouble Code: Throttle Actuator Control System - High Airflow Detected
P2173 code definition Throttle Actuator Control System - High Airflow Detected What the P2173 code means Code P2173 means that there is...
P0210 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 10
P0210 P0210 code definition Injector Circuit Malfunction - Cylinder 10 What the P0210 code means P0210 will be seen when the Engine Control Module (ECM) has found a malfunction within the cylinder 10 fuel injector circuit. The ECM constantly...

Related questions

My car has trouble code P0745, do I need to replace the solenoid?

Diagnostic Trouble Code P0745 refers to out of range voltage at a solenoid-operated valve that regulates hydraulic pressure in the transmission based on outputs from the Transmission Control Module (TCM). Code P0745 is set when the TCM sees an out...

P0030 p0015 chk eng lgt on whining noise stuck 2 gear 1 yr had car let son drive 2 NV havent chk fluid N trans hope it wasnt low

The code P0015 is a bank 1 timing over retarded warning. The P0030 code stands for the heated oxygen sensor malfunction, which also pertains to bank 1. The oxygen sensor malfunction could be due to a failed sensor, heater, or...

My car won't let me drive passed 2500 rpm. And I have no idea why it is doing that when I recently bought it.

The reason it will not go over 2500 rpm is because the computer is in limp mode. This mode is for when the computer has a failure in it. Limp mode will trigger if there is an issue with one...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com