Parts for your 2016 Subaru Xv-Knock sensor

2016 Subaru XV knock sensor – what it does, why it matters, and when to replace it

Technical sources from Subaru’s Factory Service Manual for the GP-series XV/Crosstrek (Engine Diagnostics showing DTC P0327/P0328 – Knock Sensor Circuit Low/High), Subaru FB20 engine control training notes (detailing piezoelectric knock sensing), and genuine Subaru parts catalogues for the 2016 model year all confirm the 2016 Subaru XV (FB20 2.0‑litre petrol) is fitted with a knock sensor mounted to the cylinder block. So yes, the knock sensor is relevant and used on this vehicle.

The knock sensor on a 2016 Subaru XV is a small but clever bit of hardware that listens for abnormal combustion (knock/ping) in the FB20 engine. It sends a signal to the ECU so timing can be pulled back just enough to protect the engine while keeping power and fuel economy tidy. That means smoother running on Aussie and Kiwi fuels, better reliability when the mercury climbs, and less chance of damaging detonation if the fuel quality isn’t flash.

There isn’t a scheduled replacement interval for the knock sensor, it’s a replace-on-condition item. If the Check Engine Light comes on with codes like P0327 or P0328, or the XV feels flat, uses more petrol than usual, or pings under load, the sensor or its wiring could be the culprit. A proper diagnosis should include checking live knock correction data, inspecting the connector for corrosion or oil contamination, and confirming harness integrity before calling it on the sensor.

When replacement is needed, a quality OEM-equivalent sensor is the go. It bolts to the engine block under the intake area, fitment is straightforward for a trained tech. Key tips:

• Always torque the sensor to the factory spec and orient it correctly—over-tightening or misalignment can skew readings.
• Keep the mating surface clean and dry, don’t use thread sealants.
• Clear fault codes and complete an ECU relearn/drive cycle so timing control settles in.

A healthy knock sensor helps the XV run the best it can on 91–95 RON. If it’s ignored when faulty, the ECU may stay in a safe, retarded timing map—drivable, sure, but down on grunt and economy—and it leaves less protection if real knock turns up. As part of routine servicing, it’s worth a quick look at the loom and connector, especially if there’s been an oil leak or recent engine work. Sorted early, it’s a quick, affordable fix that protects the engine for the long haul.

Popular questions

Does the 2016 Subaru XV have a knock sensor?
Yes. Subaru’s service documentation for the GP-series XV/Crosstrek lists knock-sensor diagnostics (DTC P0327/P0328), and parts catalogues show a dedicated knock sensor for the FB20 engine.

Where is the knock sensor on a 2016 XV?
It’s bolted to the engine block beneath the intake area, near the centreline of the block. Access is typically from above with the intake plumbing out of the way.

Should the knock sensor be replaced during regular servicing?
No routine interval—replace only if diagnosed faulty or damaged. During services, a visual check of the connector and wiring is smart practice, especially after oil leaks or engine repairs.