Subaru Error Code P0328: How to Fix It

Q: Can I drive my Subaru with P0328 error code?

You can drive short distances, but avoid heavy acceleration and high RPMs. The engine may have reduced power and poor fuel economy. Get it diagnosed and repaired as soon as possible to prevent potential engine damage.

Q: What causes Subaru P0328 knock sensor code?

Common causes include a faulty knock sensor, damaged wiring harness, corroded connections, short circuits in the sensor wiring, or rarely, a faulty engine control module (ECM).

Q: How much does it cost to fix P0328 on a Subaru?

DIY repair costs $50-150 for a new knock sensor. Professional repair typically ranges from $200-400 including labor. Costs may be higher if extensive wiring repair is needed.

Q: Where is the knock sensor located on Subaru engines?

The knock sensor is typically mounted on the engine block between cylinders 1 and 2. Exact location varies by engine type (2.0L, 2.5L, etc.) and model year. Check your service manual for the specific location.

Q: Will P0328 cause my Subaru to fail emissions testing?

Yes, P0328 will likely cause your vehicle to fail emissions testing since it's a stored diagnostic trouble code. The code must be resolved and the vehicle's readiness monitors must complete before passing inspection.

Abstract

Subaru error code P0328 indicates that the knock sensor 1 circuit is receiving a voltage signal that's higher than normal. This sensor detects engine knock or ping, and when it malfunctions, your engine's timing may not adjust properly, potentially causing reduced performance and fuel economy.