Subaru P1087 Error Code: How to Fix It

Q: What causes Subaru P1087 tumble generator valve to stick closed?

The most common causes are carbon buildup from engine deposits, faulty vacuum lines, electrical connector corrosion, or mechanical failure of the valve actuator. Age and high mileage can also contribute to valve sticking.

Q: Can I drive my Subaru with P1087 error code?

Yes, you can drive short distances, but you may experience reduced performance, rough idle, and poor fuel economy. It's best to address this issue promptly to prevent potential engine damage and restore optimal performance.

Q: How much does it cost to fix Subaru P1087 error?

DIY repair costs range from $50-200 for parts (vacuum lines, valve assembly). Professional repair typically costs $300-600 including labor. The exact cost depends on whether cleaning resolves the issue or if valve replacement is needed.

Q: Will P1087 cause my Subaru to fail emissions testing?

Yes, an active P1087 code will likely cause your vehicle to fail emissions testing since it indicates an intake system malfunction that affects combustion efficiency. The code must be resolved and the system must pass readiness monitors.

Q: How do I prevent tumble generator valve problems in my Subaru?

Regular maintenance including quality fuel, periodic intake cleaning, and replacing air filters on schedule can help prevent carbon buildup. Using fuel system cleaners occasionally and avoiding excessive idling can also extend valve life.

Abstract

Subaru error code P1087 indicates that the tumble generator valve B1 is stuck in the closed position. This valve controls air flow into the intake manifold to create turbulence for better fuel mixing. When stuck closed, you may experience reduced engine performance, rough idling, and decreased fuel economy.