AutoCodes – Subaru – P1142 Subaru

P1142 Subaru Code - Mass Air Flow Sensor Circuit Low Input

Quick Answer

P1142 Subaru indicates Mass Air Flow Sensor Circuit Low Input. Common causes include Faulty Mass Air Flow Sensor, Mass Air Flow Sensor harness is open or shorted, Mass Air Flow Sensor circuit poor electrical connection. 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 Mass Air Flow Sensor, Mass Air Flow Sensor harness is open or shorted, Mass Air Flow Sensor circuit poor electrical connection.
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 7,264

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 Apr 30, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1142 Subaru Description

OBDII Code P1142 Subaru - Mass Air Flow Sensor Circuit Low Input - AutoCodes.com — P1142 Subaru Code - Mass Air Flow Sensor Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P1142 Subaru?

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 P1142 Subaru?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1142 Subaru 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.

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

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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 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.