Parts for your 2020 Nissan Pathfinder-Knock sensor

2020 Nissan Pathfinder knock sensor — what it does and when to sort it out

Verdict: the 2020 Nissan Pathfinder is fitted with a knock sensor. This is confirmed by Nissan’s Factory Service Manual (R52, 2019–2020) in the Engine Control (EC) section describing the Knock Sensor (KS), Nissan’s Electronic Parts Catalogue (FAST) listing a KS for the VQ35DD 3.5‑litre V6, and the ECM’s diagnostic coverage for P0325/P0327/P0328 knock-sensor fault codes. So it’s absolutely relevant to the 2020 Pathfinder’s engine management.

On the 3.5‑litre VQ35DD V6, the knock sensor listens for detonation (that rattly “pinging” sound) and gives the engine computer a heads-up so it can trim ignition timing on the fly. That protects the engine under load, keeps it smooth on our variable Aussie and Kiwi fuels, and helps maintain power and economy without risking damage.

When a knock sensor or its wiring plays up, the Pathfinder can feel a bit flat because the ECM pulls timing as a safety move. The check engine light often chimes in with codes like P0325. Drivers might notice rough running, higher fuel use, or audible pinging under load if the system can’t properly detect knock.

As for servicing, the knock sensor isn’t a routine replacement item. It’s more of a “fix it when it faults” part. A good approach during regular servicing is to scan for fault codes, check live data if there’s any hint of pinging, and visually inspect the harness and connector. The unit is mounted in the V of the block under the intake manifold, so access needs the manifold off, if that job’s already on the cards (say, for intake cleaning or coolant pipe work), many techs will proactively replace a tired or oil-soaked sensor due to the shared labour. Use new intake manifold gaskets, route the loom neatly, and torque the sensor correctly (around 20 N·m) to ensure reliable signal quality.

Day to day, using quality petrol of the recommended octane, keeping the cooling system healthy, and addressing carbon build-up during scheduled maintenance all help the knock-control system do its job. If a knock fault pops up, don’t leave it—sorting it promptly keeps the V6 cheerful, efficient, and protected on long Kiwi and Aussie road trips.

• Common signs of trouble: check engine light (P0325/P0327/P0328), reduced power, pinging under load, poor fuel economy.
• Practical tips: diagnose before buying parts, inspect wiring/connectors, replace manifold gaskets on reassembly, clear codes and road-test.

FAQs

Does the 2020 Pathfinder have a knock sensor and where is it?
Yes. The VQ35DD V6 uses a knock sensor mounted on the engine block in the V (beneath the intake manifold). It listens for detonation so the ECM can fine-tune ignition timing and protect the engine.

When should the knock sensor be replaced?
Only when it’s faulty or contaminated/damaged. It’s not a scheduled item. Because the intake manifold has to come off for access, many workshops time replacement with other manifold-off jobs and always use new gaskets.

Is it safe to drive with a knock sensor fault?
The engine will usually run with retarded timing, which protects it but reduces power and efficiency. Driving short term to a workshop is typically fine, but it’s best to fix it promptly so proper knock control is restored.