Parts for your 2014 Nissan Pathfinder-Knock sensor

2014 Nissan Pathfinder Knock Sensor — What it does and when to service it

Yes, the 2014 Nissan Pathfinder (R52, VQ35DE 3.5‑litre V6) is fitted with a knock sensor and it’s very much relevant to how the engine runs. Technical references that confirm this include the Nissan Factory Service Manual for the 2014 Pathfinder (Engine Control, EC section, which specifies a Knock Sensor/KS in the control strategy), standard OBD‑II diagnostics for this model that define DTCs P0325, P0327 and P0328 for the knock sensor circuit, and Nissan parts catalogues listing a knock sensor for the VQ35DE used in the 2014 Pathfinder.

The knock sensor’s job is simple but crucial: it “listens” for detonation (pinging) and lets the engine computer trim ignition timing on the fly. That keeps the V6 smooth and efficient on everyday 91 RON fuel, protects the engine under heavy loads (towing the boat, long hills, hot days), and helps fuel economy and throttle response stay on song. On the V6 Pathfinder it’s a single, wideband sensor mounted in the valley of the engine beneath the upper intake manifold.

There’s no routine replacement interval for the knock sensor—it’s a solid-state part that’s usually “fit and forget”. Still, it pays to keep an eye out for tell-tales. If the Check Engine light pops up with P0325/P0327/P0328, there’s audible pinging, the car feels doughy, or fuel use jumps, the knock sensor circuit is worth a look.

• Typical symptoms: pinging under load, reduced power, higher fuel use, MIL on with P0325/P0327/P0328.
• Common causes: sensor failure, heat-hardened wiring/connector in the valley, intake or PCV vacuum leaks causing real knock.

Replacement is straightforward for a pro but a bit involved: the upper intake manifold/plenum needs to come off to access the sensor. Best practice during that job includes new intake gaskets, checking the harness for brittleness, cleaning earth points, and tightening the new sensor to the factory torque spec from the Nissan service manual. A genuine or high-quality aftermarket sensor matched to the Pathfinder’s VQ35DE is the go. Allow roughly 2–3 hours labour depending on workshop and access.

Good fuel, fresh spark plugs at the specified interval, and fixing any intake leaks will keep the knock sensor happy because they reduce the chance of real detonation. If a fault code appears, it’s fine to drive gently to a workshop, but don’t leave it for ages—without accurate knock feedback, the ECU may pull timing and performance will suffer, and prolonged real knock can be harsh on the engine.

Popular questions

Does the 2014 Pathfinder have one or two knock sensors?
The 2014 R52 Pathfinder with the VQ35DE V6 uses a single knock sensor mounted in the engine valley beneath the upper intake manifold. Earlier or different Nissan engines can use twin sensors, so if in doubt, confirm by VIN with a parts interpreter.

Is it okay to drive with a P0325 knock sensor code?
Short term, gentle driving is usually fine, as the ECU will pull timing to protect the engine. Performance and economy won’t be flash, though. If there’s real detonation from another cause, delaying repairs can risk engine damage—so book it in sooner rather than later.

What else should be done when replacing the knock sensor?
Because the manifold comes off, it’s smart to fit new intake gaskets, inspect the wiring and connector, and check for vacuum leaks. Ask the workshop to use the factory torque spec from the Nissan service manual and clear/road-test for any returning codes.