Parts for your 2013 Mazda Premacy-Knock sensor

2013 Mazda Premacy knock sensor — fitted, what it does, and how to look after it

Technical sources confirm the 2013 Mazda Premacy (CW series) is fitted with a knock sensor. The Mazda Premacy/Mazda5 (CW) Workshop Manual lists the Knock Sensor (KS) within the Engine Control System, with diagnostics covering DTCs P0325 (Knock Sensor Circuit), P0327 (Knock Sensor Circuit Low), and P0328 (Knock Sensor Circuit High). The Mazda Electronic Parts Catalogue for the CW platform also shows a knock sensor for both the 2.0 MZR (LF-VE) and 2.0 SKYACTIV-G (PE-VPS) engines. Mazda engine service manuals for LF-VE and SKYACTIV-G further describe the sensor’s role in ignition timing control.

On this Premacy, the knock sensor is a small piezoelectric microphone bolted to the engine block. Its job is to “listen” for detonation (that metallic ping under load) and tell the ECU to trim ignition timing, keeping the engine safe while still making decent power and sipping petrol sensibly. It’s working all the time — especially noticeable during hot days, highway climbs, or when the fuel isn’t top notch — and it’s a big reason modern engines last longer with cleaner emissions.

As a service item, the knock sensor isn’t something that needs regular replacement. What matters is that it’s tight to spec, mounted on a clean, flat surface, and its wiring is healthy. During routine servicing, it’s worth eyeballing the harness and connector for oil soak, heat damage, or crushed insulation. If the ECU logs P0325/P0327/P0328, or if there’s pinging, sluggish performance, or higher fuel use, diagnosis moves to live data and a proper check of the sensor, its wiring, and engine fundamentals (fuel quality, intake leaks, carbon build-up).

• Replacement tips for a 2013 Premacy:
  • Confirm the fault with scan data and a wiring check before swapping parts.
  • Remove undertrays/air ducting as needed, access varies by engine and market.
  • Clean the block pad and torque the sensor exactly to spec (over-tightening dulls sensitivity).
  • Route the loom exactly as per the workshop manual, away from ignition and alternator noise.
  • Clear codes and road-test under load, verify knock correction behaves normally.

Common symptoms of a crook or unhappy knock sensor system include a check-engine light with P0325–P0328, audible pinging under load, flat acceleration, and increased fuel use. Using the fuel grade specified in the owner’s manual, keeping the cooling system healthy, and staying on top of carbon build-up all help the knock control system do its best work.

• Where is the knock sensor on a 2013 Mazda Premacy?
  It’s bolted to the engine block, typically near the middle cylinders. On the CW Premacy, access can be from above or below depending on the engine and local ancillaries. A workshop manual view makes identification straightforward.
• Does the knock sensor need routine replacement?
  No routine interval. It’s replaced when there’s a confirmed fault or damage. Regular servicing should include a quick check of the connector and harness condition.
• What are the signs the knock sensor system isn’t happy?
  Check-engine light with P0325, P0327, or P0328, pinging under load, lazy throttle response, and higher fuel use. Always verify fuel quality and basic engine health before condemning the sensor.