Parts for your 2017 Toyota Wish-Knock sensor

2017 Toyota Wish knock sensor — what it does and how to look after it

Technical sources confirm the 2017 Toyota Wish (ZGE2# series) is fitted with a knock sensor. Toyota’s Repair Manual for the 2ZR-FAE/3ZR-FAE engines describes a non‑resonant, flat‑response knock sensor mounted to the cylinder block and used by the ECM to control ignition timing. Toyota New Car Features for the ZR engines explains the knock control strategy that relies on this sensor, and the Toyota Electronic Parts Catalogue lists a “Sensor, Knock” for ZGE20/ZGE25 Wish variants. Toyota diagnostic documentation also specifies DTCs P0325, P0327 and P0328 for the knock sensor circuit on these engines.

On the 2017 Toyota Wish, the knock sensor is essentially the engine’s ears. It listens for the high‑frequency “ping” of detonation and lets the ECU trim ignition timing to protect the engine while keeping performance and fuel economy tidy, even on everyday 91–95 RON petrol. When everything’s healthy, the driver never notices it working, they just get smooth pull and decent economy without knock under load.

As part of routine servicing, the knock sensor isn’t a scheduled replacement item, but it’s smart to keep it in mind. If the Check Engine Light pops up with codes like P0325/P0327/P0328, if there’s noticeable pinging under load, or if the Wish feels a bit doughy and drinks more fuel than usual, attention to the knock sensor and its wiring is worthwhile.

Replacement is straightforward for a trained tech but can be fiddly due to access under the intake side of the ZR engine. The golden rules are simple: use a quality OEM‑spec sensor, fit it to a clean, dry block surface, route and clip the harness exactly as per the factory layout, and tighten it to the specified torque from the Toyota Repair Manual—don’t guess. After installation, clear fault codes with a scan tool and road‑test under a light uphill load to confirm knock control behaves as expected.

A bit of preventative care helps too:

• Use reputable fuel and avoid heavy carbon build‑up with regular long runs.
• During major services, have the loom and connector visually checked for heat or oil damage.
• Fix any coolant or oil leaks near the block that could contaminate the sensor area.

Looked after properly, the Wish’s knock sensor quietly keeps the engine safe while letting the ECU squeeze the best from every tank.

FAQs

Where is the knock sensor on a 2017 Toyota Wish?
It’s bolted to the engine block on the intake side of the 2ZR‑FAE/3ZR‑FAE engine, beneath the manifold area. Access typically requires removing intake ducting and working from above, exact steps vary by tools and trim.

What are the symptoms of a failing knock sensor?
Common signs are a Check Engine Light with codes P0325/P0327/P0328, reduced power, lazier acceleration, and sometimes audible pinging under load. Fuel economy can slip because the ECU may run safer, retarded timing if it doesn’t trust the signal.

Is it safe to keep driving with a bad knock sensor?
The ECU will try to protect the engine by pulling timing, so it’s usually drivable, but performance suffers and true knock may go unchecked. It’s best to sort it promptly to avoid long‑term stress on the engine and catalytic converter.