AutoCodes – Nissan – P0102 2009 Nissan Altima Sedan

P0102 2009 Nissan Altima Sedan Code - Mass or Volume Air Flow Circuit Low 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: P0102 2009 Nissan Altima Sedan indicates Mass or Volume Air Flow Circuit Low 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 4,729

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 P0102 2009 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 less than the factory specifications.

OBDII Code P0102 2009 Nissan Altima Sedan - Mass or Volume Air Flow Circuit Low Input - AutoCodes.com — P0102 2009 Nissan Altima Sedan Code - Mass or Volume Air Flow Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0102 2009 Nissan Altima Sedan?

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

How to Fix the DTC P0102 2009 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 P0102 2009 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 P0102 2009 Nissan Altima Sedan Code

1. What are the common symptoms of OBDII code P0102 on a 2009 Nissan Altima Sedan?

- Common symptoms include poor acceleration, rough idling, stalling, decreased fuel efficiency, and possible hesitation during acceleration.

2. What are the possible causes of OBDII code P0102 on a 2009 Nissan Altima Sedan?

- The code P0102 typically indicates an issue with the mass airflow sensor (MAF), a vacuum leak, a dirty air filter, a faulty electrical connection, or a problem with the intake air system.

3. How can I diagnose the cause of OBDII code P0102 on my 2009 Nissan Altima Sedan?

- You can start by checking the MAF sensor for any dirt or debris, inspecting the air filter for cleanliness, testing the sensor's electrical connections, and looking for any visible signs of damage or leaks in the intake system.

4. Can a dirty air filter trigger OBDII code P0102 on a 2009 Nissan Altima Sedan?

- Yes, a dirty air filter can restrict airflow to the MAF sensor, causing it to give a low input reading and trigger the P0102 trouble code.

5. Is it safe to drive with OBDII code P0102 on a 2009 Nissan Altima Sedan?

- It is not recommended to drive with code P0102 as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components if left unresolved.

6. What are some repair tips for fixing OBDII code P0102 on a 2009 Nissan Altima Sedan?

- You can start by cleaning or replacing the air filter, inspecting and cleaning the MAF sensor, checking for and repairing any vacuum leaks, and ensuring all electrical connections are secure and in good condition.

7. Can a faulty oxygen sensor cause OBDII code P0102 on a 2009 Nissan Altima Sedan?

- While a faulty oxygen sensor is not a common cause of code P0102, it can contribute to poor engine performance and trigger related trouble codes.

8. Will resetting the OBDII system clear code P0102 on a 2009 Nissan Altima Sedan?

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

9. How much does it typically cost to repair OBDII code P0102 on a 2009 Nissan Altima Sedan?

- The cost of repairing code P0102 can vary depending on the specific cause, but it may range from around $100 for a simple fix like cleaning the MAF sensor to several hundred dollars for more complex repairs or part replacements.

10. Can a DIY enthusiast fix OBDII code P0102 on a 2009 Nissan Altima Sedan?

- Yes, some aspects of diagnosing and repairing code P0102 can be tackled by a DIY enthusiast with basic tools, knowledge, and the willingness to follow step-by-step guides or tutorials. However, if unsure, it's always best to consult a professional mechanic.