Parts for your 2015 Volvo Xc60-Knock sensor

2015 Volvo XC60 knock sensor — what’s fitted, what’s not

Based on Volvo’s technical documentation (VIDA service information for MY2015 XC60) and the Volvo Genuine Parts catalogue, knock sensors are fitted to the 2015 XC60 petrol engines (e.g., Drive‑E 2.0 T5 and the six‑cylinder T6). Bosch/Marelli engine management used on these petrol variants relies on one or two piezoelectric knock sensors mounted to the block. For the 2015 XC60 diesel variants (D4/D5), a conventional petrol‑style knock sensor is not used, those engines manage combustion differently and use other feedback strategies (e.g., rail pressure, crank/cam correlation, and exhaust/aftertreatment sensing) rather than detonation sensing.

On petrol 2015 XC60s, the knock sensor’s job is to “listen” for the high‑frequency vibration that indicates detonation (pinging). The ECU then trims ignition timing to keep the engine safe and efficient, letting it run decent spark advance on Aussie and Kiwi fuels without risking damage. It’s a quiet hero that protects pistons and keeps performance crisp.

There’s no scheduled servicing for the knock sensor itself, but it’s smart to give it some attention during major services or when chasing drivability gremlins. Typical signs of a knock sensor issue include:

• Check engine light with codes like P0325–P0334
• Noticeable pinging under load, or the opposite — doughy performance and poor fuel economy from excessive timing retard
• Intermittent misfire feel with no clear ignition fault

Replacement is straightforward for an experienced tech but does require care. The sensor must be tightened exactly to the OEM torque and placed flat and clean on the block, over‑ or under‑tightening changes its sensitivity. It’s also vital to route the loom away from ignition leads and high‑current wiring to avoid false knock detection.

• Inspect the harness and connector for oil ingress, corrosion, or chafe during regular servicing.
• If removing the sensor, clean the block contact with solvent and a lint‑free cloth, never sand or paint the surface.
• Use the correct orientation tab/locating feature as shown in VIDA, and torque to the specified value.
• After replacement, clear fault codes and perform a proper road test so the ECU can relearn knock control trims.

For diesel XC60s, a “knock sensor” isn’t applicable, if there’s clatter, smoke, or loss of power, diagnostics will focus on fuel delivery, air management, and aftertreatment rather than knock detection.

Does a 2015 XC60 diesel have a knock sensor?

No. The diesel variants don’t use a petrol‑style knock sensor. Their control systems manage combustion via fuel pressure and timing, airflow, and emissions sensors. If there’s a rattle or harshness concern on a diesel, a technician will look to injectors, rail pressure, mounts, or EGR/aftertreatment rather than a knock sensor.

Where is the knock sensor on a 2015 XC60 T5/T6?

On the petrol engines it’s bolted to the engine block, typically under the intake side near the midline. Some engines have two sensors positioned between cylinder pairs. Access often requires removing intake plumbing or the manifold, so plan for new gaskets if that comes off.

Do knock sensors need routine replacement?

Not usually. They’re a fit‑and‑forget item unless fault codes or symptoms point to them. During servicing, check the wiring and connector, keep the contact area clean and dry, and only replace the sensor if testing confirms it’s out of spec. Always tighten to the exact Volvo torque noted in VIDA.