Parts for your 2002 Toyota Land cruiser-Knock sensor

2002 Toyota Land Cruiser knock sensor – fitted, what it does, and how to look after it

The 2002 Toyota Land Cruiser does use knock sensors. On the petrol V8 (2UZ‑FE) fitted to UZJ100 models, there are two knock sensors mounted in the V of the block beneath the intake manifold. This is documented in Toyota’s Factory Service Manual for the 2UZ‑FE (Engine Control – Knock Sensor, DTC P0325/P0330), the 2002 Electrical Wiring Diagram for UZJ100 showing KNK1/KNK2 circuits to the ECM, and Toyota’s parts catalogue listing knock sensor p/n 89615‑12090 with sub‑harness p/n 82219‑07010.

Why it matters: the knock sensor “listens” for detonation (pinging) and lets the ECU trim ignition timing to protect the engine and keep it running sweet on Aussie and Kiwi fuels, whether it’s sipping 91 or towing up a hot hill on 95/98 RON. With healthy sensors, the Cruiser holds good power, smoothness, and decent economy without risking piston or bearing damage.

On a 2002 Land Cruiser, the sensors and their sub‑harness live in a hot spot under the manifold. With age and heat, the wiring can go brittle and the ECU may log a fault. If a sensor or the harness plays up, the ECU usually pulls timing to stay safe, which feels a bit flat and thirsty.

• Telltale signs you’ll notice:
  • Check Engine Light with codes P0325 (Bank 1) or P0330 (Bank 2)
  • Pinging under load, especially on regular unleaded
  • Sluggish performance and higher fuel use

Service and replacement tips for owners and workshops:

• There’s no routine interval, but after two decades it’s smart to inspect the sub‑harness whenever the intake’s off (e.g., for starter, coolant crossover, or manifold gaskets).
• If one side fails, many techs replace both sensors and the sub‑harness while the manifold is off to avoid doing the job twice.
• Use quality or genuine sensors, cheap copies can be noisy or dead out of the box.
• Clean the block’s seating pads, orient the sensor correctly, and torque to factory spec per the Toyota manual. Don’t over‑tighten—crushed sensors give bad readings.
• Route the new harness away from sharp edges and heat, clip it properly, then clear codes and road‑test under load.
• Plan on new manifold gaskets and allow time—this is an intake‑off job.

Looked after properly, the knock sensors help the 100 Series V8 stay reliable, responsive, and ready for long hauls across town or across the Nullarbor.

Popular questions

Where are the knock sensors on a 2002 Land Cruiser?
They’re tucked under the intake manifold in the V of the 2UZ‑FE. There are two sensors—one for each bank—connected by a dedicated sub‑harness to the engine loom. Access requires removing the upper intake components, so many owners tackle related jobs at the same time.

Is it safe to drive with a knock sensor fault?
Short‑term, the ECU will usually retard timing to protect the engine, so you’ll feel reduced power and use a bit more fuel. Prolonged driving with a fault isn’t ideal—if detonation isn’t detected properly, there’s a risk of engine damage under heavy load. Best to diagnose and fix it promptly.

What codes point to knock sensor issues on the 100 Series?
Common codes are P0325 (Knock Sensor Bank 1) and P0330 (Knock Sensor Bank 2). These can be caused by a failed sensor, a brittle or cracked sub‑harness, poor connections, or—in rarer cases—ECU or grounding issues. Proper testing per the Toyota manual will pinpoint the culprit.