Parts for your 2017 Nissan Pathfinder-Knock sensor

2017 Nissan Pathfinder knock sensor — what it does, where it sits, and when to sort it

Technical confirmation: the 2017 Nissan Pathfinder (R52, 3.5‑litre VQ35DD petrol) is fitted with knock sensors and actively uses them for ignition timing control. This is documented in the Nissan Factory Service Manual (R52, EC – Engine Control: DTC P0327/P0328 “Knock Sensor 1” and P0330 “Knock Sensor 2”) and reflected in Nissan’s electronic parts catalog for the 2017 Pathfinder, which lists knock sensor units mounted on the engine block beneath the intake manifold. So yes, the knock sensor is absolutely relevant on this model.

On the 2017 Pathfinder, the knock sensor setup listens for detonation (knock) and lets the engine computer trim ignition timing to protect the engine and keep it running sweet. With modern direct‑injection VQ35DD engines, fine control of spark is a big part of getting smooth torque and decent economy on our 91–98 RON fuels here in Australia and New Zealand. When the knock sensors pick up the tell‑tale vibration signature, the ECU dials timing back just enough to avoid damage while maintaining performance.

It’s not a routine service item like oil or filters, but the knock sensors and their sub‑harness deserve attention if there’s a Check Engine Light or drivability niggles. Common signs worth investigating include:

• Check Engine Light with codes like P0327, P0328 or P0330
• Flat spots, rough running, or noticeably lazy performance under load
• Increased fuel use or pinging under acceleration

Replacement on the 2017 Pathfinder typically involves removing the upper intake/plenum to access the sensor(s) on the valley of the V6. That means planning for new intake manifold gaskets, carefully labelling hoses and connectors, and following the Nissan torque specs and tightening sequence. A good tech will also inspect the sub‑harness for chafing, make sure the sensor mating surfaces are clean and dry, and route the loom exactly as per the manual to avoid false knock readings. After refit, clear codes, perform an idle learn if specified, and road‑test on quality petrol (95 RON or higher can help reduce knock in hot conditions or under load).

As part of general servicing, it’s smart to:

1. Scan for pending DTCs even if no light is on
2. Keep the cooling system and PCV in good nick to reduce knock tendency
3. Use the recommended fuel grade and stay on top of carbon build‑up with quality fuel and regular highway runs

Handled properly, the knock sensors help the VQ35DD deliver reliable pull and protect the engine for the long haul.

Popular questions

Where is the knock sensor on a 2017 Pathfinder?
It’s mounted on the engine block under the intake manifold in the “V” of the V6. Access usually requires removing the upper intake/plenum and related hardware. Because access is tight, most workshops allow a few hours and replace the intake gaskets during reassembly.

Is it safe to drive with a knock sensor fault?
The ECU often retards timing to play it safe, so the vehicle may still run, but with reduced performance and higher fuel use. Prolonged driving isn’t recommended—get it diagnosed and sorted to avoid masking a genuine knock issue and to restore proper ignition control.

What causes knock sensor codes on these Pathfinders?
Common culprits include a failed sensor, damaged sub‑harness, poor sensor seating, or actual engine knock from low‑octane fuel, heavy carbon build‑up, or cooling issues. Proper diagnosis includes checking wiring integrity, verifying fuel quality, and ensuring the sensor is torqued to spec on a clean mounting surface.