Parts for your 2015 Toyota Prius-Knock sensor

2015 Toyota Prius Knock Sensor — what it does, when to replace, and handy service tips

Technical sources confirm the 2015 Toyota Prius (ZVW30, 2ZR-FXE engine) is fitted with a knock sensor. Toyota’s Repair Manual (TIS) includes diagnostics for DTCs P0327/P0328 “Knock Sensor Circuit,” the New Car Features (NCF) manual describes “Knock Control” for the 2ZR‑FXE, and the Toyota Electronic Parts Catalogue lists a dedicated knock sensor for this engine. So yes—this model absolutely uses a knock sensor.

The knock sensor on a 2015 Prius is a small, robust microphone bolted to the engine block that listens for the sharp vibration signature of detonation (knock). When it hears that tell‑tale ping, the engine ECU trims ignition timing and, along with EGR and mixture strategies, keeps the 1.8‑litre Atkinson‑cycle petrol engine running smoothly and efficiently. That’s important not just for performance and fuel economy, but also for protecting the engine under Aussie and Kiwi driving conditions—hot days, long climbs, and variable fuel quality can all invite knock without the sensor’s quick intervention.

There’s no scheduled replacement interval for the knock sensor, it’s a “fit and forget” component. During regular servicing, it’s smart to visually check the wiring loom and connector under the intake manifold area, especially if the vehicle has done big kilometres or had previous engine bay work. If the check engine light pops up with codes like P0327 or P0328, or if there’s noticeable rattling under load, lazy acceleration, or worse fuel economy, the workshop will typically verify wiring integrity first, then test sensor output with a scan tool and a tap test per the Toyota Repair Manual procedures.

• Common symptoms of a crook knock sensor or circuit fault:
  • Check engine light with P0327/P0328
  • Sluggish performance and higher fuel use
  • Pinging sounds under load (less common if the ECU has already pulled timing)
• Replacement tips:
  • Access usually requires removing the intake manifold, budget extra time and new gaskets
  • Clean the block’s mating surface, never use sealant on the sensor face
  • Tighten to the factory torque spec—overtightening can skew readings
  • Route and clip the harness exactly as per the manual to avoid noise interference

After fitting, clear codes, check live knock feedback and ignition advance on a scan tool, and take a proper road test. Using quality 91–95 RON fuel, keeping the cooling system healthy, and staying on top of EGR/intake cleanliness all help the ECU’s knock control do its job and keep this Prius humming along efficiently.

Popular questions about the 2015 Toyota Prius knock sensor

Does the 2015 Prius definitely have a knock sensor, and where is it?
The 2015 Prius does have a knock sensor. It’s mounted on the engine block of the 2ZR‑FXE, beneath the intake manifold area. Access generally involves removing the intake manifold, so it’s not typically a quick driveway job.

What are the signs of a failing knock sensor on this model?
Most owners will first see a check engine light with codes like P0327 or P0328. You might notice reduced power, slightly worse fuel economy, or occasional pinging under load. A proper diagnosis should always confirm the sensor and wiring before replacement.

Is it safe to keep driving with a knock sensor fault?
The car will usually pull timing to protect the engine, so it may feel down on power. Short trips to the workshop are usually fine, but continued driving isn’t a great idea—timing that’s too retarded hurts economy and performance, and if knock isn’t controlled, engine damage is possible. Get it checked promptly.