Subaru Error Code P1143: How to Fix It

Q: Can I drive with Subaru error code P1143?

While you may be able to drive short distances, P1143 can cause poor acceleration, rough idling, and potential stalling. It's recommended to address this issue promptly to avoid further engine damage or being stranded.

Q: How much does it cost to fix P1143 on a Subaru?

DIY repair costs range from $50-150 for a replacement throttle position sensor. Professional repair typically costs $200-400 including labor and parts, depending on your location and specific Subaru model.

Q: What causes throttle position sensor 2 high input?

Common causes include a faulty throttle position sensor, damaged wiring or connectors, carbon buildup on the throttle body, or issues with the engine control module. Environmental factors like moisture or corrosion can also trigger this error.

Q: Will P1143 cause my Subaru to fail emissions testing?

Yes, error code P1143 will likely cause your vehicle to fail emissions testing. Most states require all stored error codes to be cleared and the vehicle to pass a drive cycle before it can pass inspection.

Q: How do I prevent P1143 from happening again?

Regular maintenance including periodic throttle body cleaning, protecting electrical connections from moisture, and addressing any rough idle issues promptly can help prevent recurrence of this error code.

Abstract

Subaru error code P1143 indicates that your throttle position sensor 2 is sending a voltage signal that's higher than expected to the engine control module. This sensor malfunction can cause poor engine performance, rough idling, and potential stalling issues.