AutoCodes – Nissan – P0103 2012 Nissan Altima Sedan

P0103 2012 Nissan Altima Sedan Code - Mass Air Flow Sensor Circuit High Input

Quick Answer

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0103 2012 Nissan Altima Sedan indicates Mass Air Flow Sensor Circuit High Input.
Common causes: Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, Intake air leaks.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,003

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0103 2012 Nissan Altima Sedan Description

The Mass Air Flow (MAF) sensor is placed in the stream of the intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM). The ECM controls the temperature of the hot film by a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAF Sensor Signal is more than the factory specifications.

OBDII Code P0103 2012 Nissan Altima Sedan - Mass Air Flow Sensor Circuit High Input - AutoCodes.com — P0103 2012 Nissan Altima Sedan Code - Mass Air Flow Sensor Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0103 2012 Nissan Altima Sedan?

Dirty Air Filter
Dirty Mass Air Flow (MAF) Sensor
Intake air leaks
Faulty Mass Air Flow Sensor
Mass Air Flow Sensor harness is open or shorted
Mass Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P0103 2012 Nissan Altima Sedan?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Before replacing the Mass Air Flow (MAF) Sensor, try replacing the air filter and cleaning the Mass Air Flow Sensor with low compress air or Mass Air Flow Sensor Cleaner. Reset code and drive vehicle. If the code comes back, you must replace the Mass Air Flow Sensor to fix the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0103 2012 Nissan Altima Sedan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0103 2012 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0103 on a 2012 Nissan Altima Sedan?

- Common symptoms include poor engine performance, rough idling, stalling, decreased fuel efficiency, and a Check Engine light.

2. What does the OBDII code P0103 indicating "Mass Air Flow Sensor Circuit High Input" mean for a 2012 Nissan Altima Sedan?

- This code suggests that the mass air flow (MAF) sensor is receiving a higher than expected voltage signal from the circuit.

3. What are the potential causes of OBDII code P0103 on a 2012 Nissan Altima Sedan?

- Causes may include a faulty MAF sensor, issues with the MAF sensor wiring or connectors, a vacuum leak, or a clogged air filter.

4. How can I diagnose the OBDII code P0103 on my 2012 Nissan Altima Sedan?

- You can start by visually inspecting the MAF sensor, checking for damaged wires or connections, and using a multimeter to test the sensor's voltage output.

5. Can a dirty air filter trigger OBDII code P0103 on a 2012 Nissan Altima Sedan?

- Yes, a clogged or dirty air filter can disrupt the proper airflow readings, which may lead to the MAF sensor circuit registering a high input.

6. What are the recommended repair steps for resolving OBDII code P0103 on a 2012 Nissan Altima Sedan?

- Repair steps may involve cleaning or replacing the MAF sensor, inspecting and repairing any damaged wiring, fixing vacuum leaks, and ensuring proper air filter maintenance.

7. Is it safe to continue driving with OBDII code P0103 present on a 2012 Nissan Altima Sedan?

- It is generally not recommended to drive with this code present, as it can lead to further engine issues and decreased performance.

8. Can a DIY enthusiast fix OBDII code P0103 on a 2012 Nissan Altima Sedan?

- Depending on their skill level, a DIY enthusiast may be able to address this code by following repair guides and using the necessary tools.

9. How much does it typically cost to repair OBDII code P0103 on a 2012 Nissan Altima Sedan at a professional mechanic or dealership?

- The cost can vary depending on the exact cause of the issue, but repairs for this code may range from $100 to $300 or more, including parts and labor.

10. Will resetting the OBDII system clear the P0103 code on a 2012 Nissan Altima Sedan?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after some driving cycles.