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Engine-Codes – Subaru – P1087 Subaru

P1087 Subaru Code - Tumble Generated Valve Position Circuit High Sensor 2

Quick Answer

The P1087 diagnostic trouble code (DTC) for Subaru vehicles specifically refers to the Tumble Generator Valve Position Sensor Circuit High Input for Sensor 2. Common causes include Faulty tumble generator valve position sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction. 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
P1087 Subaru indicates Tumble Generated Valve Position Circuit High Sensor 2.
Common causes
Common causes include Faulty tumble generator valve position sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction.
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
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Code P1087 Subaru Description

The P1087 diagnostic trouble code (DTC) for Subaru vehicles specifically refers to the Tumble Generator Valve Position Sensor Circuit High Input for Sensor 2. This code indicates that there is a problem with the electrical circuit that controls the position of the tumble generator valve sensor 2. The tumble generator valve is a component in the intake system that helps optimize air intake flow for better engine performance and fuel efficiency. The sensor monitors the position of the valve and sends feedback to the engine control module (ECM) to ensure proper operation.

OBDII Code P1087 Subaru - Tumble Generated Valve Position Circuit High Sensor 2
P1087 Subaru Code - Tumble Generated Valve Position Circuit High Sensor 2

Common Causes of P1087 Subaru

  1. Faulty tumble generator valve position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Vacuum leaks in the intake system
  5. Dirty or clogged air filter

Symptoms of P1087 Subaru

  1. Reduced engine power
  2. Poor fuel efficiency
  3. Rough idling
  4. Hesitation during acceleration
  5. Check Engine Light illuminated on the dashboard

How to Fix P1087 Subaru

  1. Begin by using a diagnostic scanner to retrieve the specific error codes and confirm that P1087 is the issue.
  2. Inspect the tumble generator valve position sensor and its wiring for any visible damage or wear.
  3. Test the sensor's functionality using a multimeter to ensure it is sending the correct signals to the ECM.
  4. Replace the faulty tumble generator valve position sensor, if necessary, and repair any damaged wiring or connectors.
  5. Clear the error codes from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1087 Subaru

The typical repair costs for addressing a P1087 code in a Subaru vehicle can vary depending on the specific cause of the issue. In general, replacing a faulty tumble generator valve position sensor or repairing damaged wiring may cost between $150 to $300, including parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary significantly, with hourly rates typically ranging from $80 to $150. It is advisable to consult with a trusted mechanic or dealership for a more precise estimate based on your location, vehicle make and model, and engine type.

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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 P1087 Subaru Code

1. What are the common symptoms of OBDII code P1087 in a Subaru related to the Tumble Generated Valve Position Circuit High Sensor 2?

The common symptoms include rough idling, decreased engine performance, and the illumination of the check engine light.

2. What could be the possible causes of OBDII code P1087 in a Subaru?

Possible causes of this code include a faulty tumble generated valve position sensor, wiring issues, vacuum leaks, or a problem with the intake manifold.

3. How can I diagnose the issue causing OBDII code P1087 in my Subaru?

Diagnosing the issue involves using an OBDII scanner to read the code, checking the tumble generated valve position sensor's wiring and connections, inspecting the intake manifold, and testing for vacuum leaks.

4. Can I continue driving my Subaru with OBDII code P1087 present?

It is not recommended to drive your Subaru with this code present, as it can lead to further engine damage and decreased performance. It's best to address the issue promptly.

5. How can I repair OBDII code P1087 in my Subaru myself?

If you have the necessary tools and expertise, you can attempt to replace the faulty tumble generated valve position sensor, repair any damaged wiring, fix vacuum leaks, or clean the intake manifold yourself.

6. Will resetting the OBDII code P1087 in my Subaru make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing P1087 is not addressed, the code is likely to return.

7. Is it safe to ignore OBDII code P1087 in my Subaru?

Ignoring this code can lead to poor engine performance, reduced fuel efficiency, and potential damage to other components. It's best to address the issue promptly.

8. Can a faulty tumble generated valve position sensor cause other problems in my Subaru?

Yes, a faulty sensor can lead to issues such as misfires, decreased fuel efficiency, and overall poor engine performance.

9. How much does it typically cost to repair OBDII code P1087 in a Subaru at a professional mechanic?

The cost of repair can vary depending on the exact cause of the code, but it may range from $200 to $500 or more, including parts and labor.

10. How long does it usually take to repair OBDII code P1087 in a Subaru?

The repair time can vary based on the specific cause of the code and the expertise of the mechanic, but it typically takes a few hours to half a day to diagnose and fix the issue.

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