P1103 OBD-II Trouble Code: Mass Airflow Sensor in Range But Higher Than Expected

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P1103 code

P1103 is a diagnostic trouble code (DTC) for "Mass Airflow Sensor in Range But Higher 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 P1103 DIAGNOSTIC Get a fair and transparent estimate upfront

P1103 code definition

The Powertrain Control Module (PCM) stores a P1103 trouble code when the voltage signal from the Mass Air Flow (MAF) sensor is higher than normal but still falls within the range specified by the manufacturer. In addition to a P1103 trouble code, other related codes the PCM might store include a P1100, P1101, P1102, and P1104 code.

What the P1103 code means

The MAF sensor sends data to the PCM in the form of a voltage signal. If the PCM receives a voltage signal from the MAF sensor that is higher than what the manufacturer has specified but the signal still falls within established parameters, a P1103 trouble code is stored and the check engine light illuminates.

What causes the P1103 code?

A common cause of a P1103 trouble code is faulty or loose wiring and connectors within the MAF sensor wiring harness. In addition to this, a leak in the vacuum system, either before or after the MAF sensor, can cause the PCM to store this code. A clogged MAF sensor screen or a dirty or bad MAF sensor are some other likely causes of a code storage.

What are the symptoms of the P1103 code?

Symptoms of a P1103 trouble code include stalling when idling, an erratically running engine, and reduced power while accelerating. In addition, a vehicle can suffer from reduced fuel efficiency from the conditions that cause a P1103 trouble code.

How does a mechanic diagnose the P1103 code?

To diagnose the P1103 trouble code, a mechanic needs to use an advanced scanner, an evaporative smoke tester, and a digital volt/ohm meter. Once the mechanic has the necessary equipment, they need to perform the following steps:

  • Inspect all wiring, connectors, and components associated with the MAF sensor, including the wiring harness. The mechanic is looking for any damaged, loose, or faulty wiring, connectors, or components when doing this inspection.
  • Remove the air filter and determine if it needs replacing.
  • While the mechanic has the air filter out, they should carefully remove the MAF sensor for cleaning with a CRC 05110 spray cleaner.
  • Next, once all components are cleaned, repaired, or replaced, the mechanic should clear the code and test the system, with the vehicle running, to see if the code returns.
  • If the code returns, the mechanic should first download any freeze frame data and stored trouble codes and then perform a smoke test to check for leaks within the vacuum system using an evaporative smoke tester.
  • Then they should clear the code after fixing any leaks and see if the code returns.
  • If the code returns, they should use a digital volt/ohm meter to test the voltage and ground signal of the MAF sensor.
  • If there is no voltage or ground signal at the MAF sensor, the mechanic should disconnect the PCM and check the continuity of the MAF sensor and circuit with the battery ground. The mechanic should also test the continuity between the MAF sensor circuit and the PCM.
  • Once all of the necessary repairs are made, the mechanic should clear the code and retest the system to see if the code returns.

Common mistakes when diagnosing the P1103 code

A mistake common to P1103 trouble code diagnosing is for the mechanic to replace the MAF sensor without checking the wiring for fault, damage, or looseness. The result is that the problem is not fixed and the code returns.

How serious is the P1103 code?

While a vehicle can still operate with a P1103 trouble code stored, the erratic running condition of the engine and the subsequent stalling while idling can make the vehicle difficult to drive. The reduced fuel efficiency also leads to more costs when putting fuel into the vehicle. Because of this, it is recommended that you deal with a P1103 trouble code as soon as possible.

What repairs can fix the P1103 code?

Repairing a P1103 trouble code requires a mechanic to do the following:

  • Replace any faulty or damaged wiring, connectors, or components within the MAF sensor wiring harness. In addition to repairing and replacing items, the mechanic should check for any loose wiring and connectors.
  • If the air filter is dirty upon inspection, the mechanic should replace it with a new one.
  • In addition, before reinstalling the air filter, the mechanic should remove and clean the MAF sensor with a CRC 05110 spray cleaner. The mechanic should be careful when removing the sensor so as not to damage the connecting wiring, which is delicate.
  • They should then repair any air leaks in the vacuum system.
  • Next, they should replace the MAF sensor if further testing determines it is bad.
  • If the PCM tests as bad, the mechanic should replace that component as well. Replacing the PCM requires the mechanic to program it upon installation.

Need help with a P1103 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.

trouble codes
OBD-II
P1103

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P1103 code.

SCHEDULE P1103 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P2406 OBD-II Trouble Code: Evaporative Emission System Leak Detection Pump Sense Circuit High
P2406 P2406 code definition EVAP Leak Detection Pump Sense Circuit High What the P2406 code means P2406 is an OBD-II code that signals the engine control module (ECM) has detected a malfunction with the EVAP leak detection pump sense circuit...
P0753 OBD-II Trouble Code: Shift Solenoid A Electrical/1-2 Shift Solenoid Circuit Electrical
P0753 code means that the PCM has detected an electrical abnormality within the transmission shift solenoid A often due too an faulty shift solenoid.
P0254 OBD-II Trouble Code: Injection Pump Fuel Metering Control “A” High (Cam/Rotor/Injector)
The The P0254 Trouble Code indicates issues with the inject pump fuel metering control “A” high (cam/rotor/injector). What the P0254 code means When this code appears, it means that the powertrain control module has found an issue with the signal...

Related questions

Timing chain problem?

It could very well be a timing chain problem. The P0016 and 17 indicate that the camshaft sensors are sensing the camshaft in a position that does not logically correspond with the crankshaft. The P0302 and P0355 codes are misfire...

Car turns on and off. The brake and the steering wheel gets harder.

Hello, thanks for writing in. The P0171 is an indication of a lean mixture, which can be caused by an air leak in the intake (as you were advised), a borderline engine temp sensor reporting a warmer engine temperature than...

Does the VIN number have to be in the ECM for the vehicle to run?

Some new ECMs will give you a certain amount of free starts before it will not start unless the VIN is added. I am not sure if this is the case with your ECM but you have a dealer telling...

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