Subaru Error Code P0327: How to Fix It

Q: Can I drive my Subaru with P0327 error code?

You can drive short distances, but prolonged driving with P0327 can cause engine damage. The knock sensor protects your engine from destructive knock/ping, so repair this code promptly to avoid potential engine damage.

Q: How much does it cost to fix P0327 on a Subaru?

DIY repair typically costs $50-120 for a new knock sensor. Professional repair ranges from $200-400 including labor. The sensor itself is relatively inexpensive, but labor can be costly due to accessibility issues on some models.

Q: What causes P0327 code in Subaru vehicles?

Common causes include a faulty knock sensor, damaged wiring, corroded connectors, or loose sensor mounting. On older Subarus, the wiring harness may deteriorate from heat and vibration exposure.

Q: Will P0327 cause my Subaru to fail inspection?

Yes, P0327 will likely cause your vehicle to fail emissions testing in most states. The check engine light must be off and no pending codes present to pass inspection.

Q: Is P0327 common on Subaru EJ25 engines?

Yes, P0327 is relatively common on EJ25 engines, particularly in 2000-2012 models. The knock sensor location makes it susceptible to heat damage and the wiring can deteriorate over time.

Abstract

The P0327 error code indicates that your Subaru's knock sensor 1 circuit is reading a low voltage signal, which prevents the engine from properly detecting engine knock or pinging. This code is particularly common on EJ25 engines and can cause rough idling, reduced power, and poor fuel economy if left unaddressed.