Parts for your 2015 Honda Accord-Knock sensor

2015 Honda Accord knock sensor — what it does, why it matters, and when to replace it

Yes, the 2015 Honda Accord is fitted with a knock sensor. This is confirmed by the Honda Accord 2013–2017 Service Manual (PGM-FI diagnostics for DTCs P0325 and P0328), common OBD-II documentation for the model year, and OEM parts catalogues that list a knock sensor for both the 2.4‑litre four-cylinder and 3.5‑litre V6 engines. It’s a standard bit of kit designed to protect the engine and keep it running sweet as.

The knock sensor sits on the engine block and “listens” for detonation (knock) — that rattly ping you sometimes hear when petrol self-ignites under high load. When the sensor detects knock, the ECU trims ignition timing and, if needed, adjusts fuelling. That prevents damage to pistons and bearings, helps maintain torque, and keeps fuel economy on track, whether the car’s sipping 91 RON or higher-octane fuel. It’s one of those quiet heroes that lets the Accord deliver smooth power day in, day out.

There’s no routine maintenance for the knock sensor itself, but it should be checked whenever the intake’s off or during major services. On the 2.4L Accord it’s mounted on the block below the intake manifold, on the V6 it’s in the valley area. Oil leaks, coolant weep, or a chafed harness can upset readings, so a quick look while the bonnet’s up can save headaches later. If a Check Engine Light pops with codes like P0325 or P0328, or the engine pings under load, feels flat, or drinks more fuel than usual, it’s time to investigate.

Replacement is straightforward for a trained tech: disconnect the battery, access the sensor (intake removal is often required on the 2.4L), unplug the connector, swap the sensor, and torque it to factory spec on a clean, dry block face. Using a quality OEM-equivalent sensor is important — cheap units can misread vibration and cause power loss. After refit, clear codes and perform any required idle/ECU relearn so timing control behaves properly.

Because the sensor is a safety net, driving long-term with a faulty one isn’t wise. The ECU may run conservative timing to protect the engine, costing performance and economy, while real knock could go unchecked. Treat it as a fix-soon item to keep the Accord running reliably across Aussie and Kiwi conditions.

• Common signs of trouble: Check Engine Light (P0325/P0328), pinging under load, sluggish acceleration, poor fuel economy.
• Good practice: inspect wiring and connectors during major services, fix nearby oil/coolant leaks promptly.

FAQs

Where is the knock sensor on a 2015 Honda Accord?
On the 2.4‑litre four-cylinder it’s mounted on the engine block beneath the intake manifold area. On the 3.5‑litre V6 it’s located in the engine valley under the upper intake. Access typically involves removing intake components for a clear shot at the sensor and its connector.

Can you drive with a faulty knock sensor?
You can usually drive short-term, but it’s not recommended. The ECU may pull timing to be safe, which saps power and can increase fuel use. More importantly, genuine knock might not be managed correctly, risking engine damage if ignored. Book it in when the light comes on.

What does replacement typically cost in AU/NZ?
As a ballpark, the part ranges roughly $120–$300 AUD/NZD, with labour from about 0.7 to 2.0 hours depending on engine and access. Many shops quote somewhere in the $250–$700 AUD/NZD range all up. Exact pricing varies with brand choice and workshop rates.