Engine-Codes.com
Engine-Codes – Subaru – P1142 Subaru

P1142 Subaru Code - Mass Air Flow Sensor Circuit Low Input

Quick Answer

The P1142 code for Subaru vehicles indicates a problem with the Mass Air Flow (MAF) sensor circuit, specifically a low input signal. Common causes include Faulty MAF sensor, Dirty or contaminated MAF sensor, Damaged wiring or connectors in the MAF sensor circuit. 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
P1142 Subaru indicates Mass Air Flow Sensor Circuit Low Input.
Common causes
Common causes include Faulty MAF sensor, Dirty or contaminated MAF sensor, Damaged wiring or connectors in the MAF sensor circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1142 Subaru Description

The P1142 code for Subaru vehicles indicates a problem with the Mass Air Flow (MAF) sensor circuit, specifically a low input signal. The MAF sensor plays a crucial role in the engine's performance by measuring the amount of air entering the engine, which allows the Engine Control Module (ECM) to adjust the air-fuel mixture for optimal combustion. When the MAF sensor detects a low input signal, it means that the sensor is not accurately measuring the airflow, leading to potential issues with fuel delivery and engine performance.

OBDII Code P1142 Subaru - Mass Air Flow Sensor Circuit Low Input
P1142 Subaru Code - Mass Air Flow Sensor Circuit Low Input

Common Causes of P1142 Subaru

  1. Faulty MAF sensor
  2. Dirty or contaminated MAF sensor
  3. Damaged wiring or connectors in the MAF sensor circuit
  4. Vacuum leaks
  5. Intake air leaks

Symptoms of P1142 Subaru

  1. Reduced engine performance
  2. Poor fuel efficiency
  3. Rough idling or stalling
  4. Hesitation or misfires during acceleration
  5. Check engine light illumination

How to Fix P1142 Subaru

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P1142 code and identify the specific cause.
  2. Inspect the MAF sensor for any dirt or contamination, cleaning it if necessary, or replacing it if it is faulty.
  3. Check the wiring and connectors in the MAF sensor circuit for any damage or corrosion, repairing or replacing them as needed.
  4. Inspect for vacuum leaks or intake air leaks, repairing any leaks found in the system.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1142 Subaru

The typical repair costs for addressing a P1142 code on a Subaru vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty MAF sensor can cost between $100 and $400, while addressing wiring or connector issues may range from $50 to $200. Labor costs typically range from $80 to $150 per hour, and the total repair cost can add up to a few hundred dollars. It is advisable to consult with a professional mechanic to get an accurate cost estimate based on the specific diagnosis and repair needed for your vehicle.

Need more information about the P1142 Subaru code?

Need more information on how to fix the P1142 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1142 Subaru code diagnosed by a professional: Find a repair shop in your area

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 P1142 Subaru Code

1. What are the common symptoms of OBDII code P1142 in a Subaru related to the Mass Air Flow Sensor Circuit Low Input?

Common symptoms include decreased engine performance, rough idling, stalling, and potential issues with acceleration.

2. What are the possible causes of OBDII code P1142 in a Subaru indicating a Mass Air Flow Sensor Circuit Low Input?

Possible causes include a faulty mass air flow sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

3. How can I diagnose the Mass Air Flow Sensor Circuit Low Input issue causing OBDII code P1142 in my Subaru?

Diagnosis typically involves checking the mass air flow sensor for proper operation, inspecting the wiring and connectors for damage, and using a scan tool to gather data from the sensor.

4. Can a dirty air filter trigger OBDII code P1142 related to the Mass Air Flow Sensor in a Subaru?

Yes, a dirty air filter can disrupt the air-to-fuel ratio and affect the mass air flow sensor readings, potentially leading to a low input error and triggering the OBDII code P1142.

5. What are some repair tips for resolving OBDII code P1142 in a Subaru caused by a Mass Air Flow Sensor Circuit Low Input?

Repair tips may include cleaning or replacing the mass air flow sensor, repairing any damaged wiring or connectors, ensuring the air filter is clean, and resetting the fault code with a scan tool after repairs.

6. Is it safe to continue driving my Subaru with OBDII code P1142 related to the Mass Air Flow Sensor Circuit Low Input?

It is not recommended to drive your Subaru with this issue as it can lead to further engine problems and decreased performance. It is best to address the underlying cause promptly.

7. Can a DIY enthusiast fix OBDII code P1142 indicating a Mass Air Flow Sensor Circuit Low Input in a Subaru?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this issue by following proper diagnostic procedures and repair steps, especially if it involves simple tasks like cleaning the sensor or replacing the air filter.

8. How much does it typically cost to repair OBDII code P1142 in a Subaru caused by a Mass Air Flow Sensor Circuit Low Input?

The cost of repairs can vary depending on the exact cause of the issue. Expenses may include the cost of a new mass air flow sensor, wiring repairs, labor fees if done by a professional, and any additional parts needed for the repair.

9. Are there any preventative measures to avoid triggering OBDII code P1142 related to the Mass Air Flow Sensor in a Subaru?

Regular maintenance, such as changing the air filter at recommended intervals, can help prevent issues with the mass air flow sensor and reduce the chances of triggering the OBDII code P1142.

10. How long does it typically take to repair OBDII code P1142 in a Subaru related to the Mass Air Flow Sensor Circuit Low Input?

The repair time can vary based on the exact cause of the issue and the complexity of the repair tasks involved. Simple fixes like cleaning the sensor may take less time compared to replacing damaged wiring or the sensor itself.

Discuss the causes and fixes for P1142 Subaru OBDII Code

Submit a New Comment

Code P1142 Subaru comments

No comments found for this page.