Subaru Error Code P1146: How to Fix It

Q: Can I drive my Subaru with error code P1146?

You can drive short distances, but the vehicle may experience poor performance, reduced fuel economy, and potential engine damage if driven extensively. Address the issue promptly to avoid costlier repairs.

Q: How much does it cost to fix Subaru P1146 error?

Repair costs range from $20-50 for vacuum lines to $150-300 for MAP sensor replacement. Professional diagnosis typically costs $100-150. Complex intake manifold repairs can cost $400-800.

Q: What causes P1146 error code in Subaru vehicles?

Common causes include faulty MAP sensor, damaged vacuum lines, loose electrical connections, intake manifold leaks, or clogged vacuum passages. Environmental factors like extreme temperatures can also affect sensor performance.

Q: How do I test a MAP sensor on a Subaru?

Use a multimeter to check reference voltage (should be ~5V) and signal voltage (1-2V at idle, increasing with RPM). You can also perform a vacuum test using a hand pump to verify the sensor responds correctly to pressure changes.

Q: Will P1146 cause my Subaru to fail emissions testing?

Yes, error code P1146 will typically cause your vehicle to fail emissions testing since it affects the air-fuel mixture calculation. The error must be resolved and the system must complete its readiness monitors before passing inspection.

Abstract

Subaru error code P1146 indicates a problem with your Manifold Absolute Pressure (MAP) sensor range or circuit. This sensor measures intake manifold pressure to help your engine's computer determine the correct air-fuel mixture. When this error occurs, you may experience poor acceleration, rough idling, or reduced fuel economy.