AutoCodes – Nissan – P0103 2009 Nissan Sentra

P0103 2009 Nissan Sentra 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 2009 Nissan Sentra 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 5,089

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 2009 Nissan Sentra 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 2009 Nissan Sentra - Mass Air Flow Sensor Circuit High Input - AutoCodes.com — P0103 2009 Nissan Sentra Code - Mass Air Flow Sensor Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0103 2009 Nissan Sentra?

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 2009 Nissan Sentra?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0103 2009 Nissan Sentra 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 2009 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0103 on a 2009 Nissan Sentra?

- Common symptoms include rough idling, engine stalling, poor acceleration, and decreased fuel efficiency.

2. What causes the Mass Air Flow (MAF) Sensor Circuit High Input error code (P0103) on a 2009 Nissan Sentra?

- The P0103 code is typically triggered by a faulty or dirty MAF sensor, damaged wiring or connectors, or a vacuum leak in the intake system.

3. How does a malfunctioning Mass Air Flow sensor affect the performance of a 2009 Nissan Sentra?

- A malfunctioning MAF sensor can lead to incorrect air-fuel mixture calculations, resulting in poor engine performance, reduced power, and potential engine misfires.

4. Can a dirty air filter cause the P0103 code on a 2009 Nissan Sentra?

- Yes, a dirty air filter can restrict air flow to the MAF sensor, causing incorrect readings and potentially triggering the P0103 code.

5. What are some DIY repair tips for resolving the P0103 code on a 2009 Nissan Sentra?

- DIY repair tips include cleaning or replacing the MAF sensor, inspecting and repairing damaged wiring or connectors, and ensuring the air filter is clean and properly installed.

6. Is it safe to continue driving a 2009 Nissan Sentra with the P0103 code illuminated?

- It is not recommended to drive with the P0103 code active, as it can lead to further engine damage and decreased fuel efficiency. It is best to address the issue promptly.

7. How can a mechanic diagnose the P0103 code on a 2009 Nissan Sentra?

- A mechanic can use an OBDII scanner to read the code, perform a visual inspection of the MAF sensor and related components, and conduct voltage and resistance tests to pinpoint the issue.

8. Will resetting the OBDII code P0103 on a 2009 Nissan Sentra make it go away permanently?

- Resetting the code may temporarily turn off the Check Engine Light, but if the underlying issue causing the P0103 code is not addressed, it is likely to reappear.

9. What is the typical cost to repair the P0103 code on a 2009 Nissan Sentra at a mechanic or dealership?

- The cost of repairing the P0103 code can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Can a faulty oxygen sensor be a potential cause of the P0103 code on a 2009 Nissan Sentra?

- While a faulty oxygen sensor can impact engine performance, it is not a common cause of the P0103 code. It is best to focus on diagnosing the MAF sensor and related components first.