Parts for your 2005 Toyota Land cruiser-Knock sensor

2005 Toyota Land Cruiser knock sensor: what’s fitted and what to service

For a 2005 Toyota Land Cruiser, whether a knock sensor is relevant depends on the engine. The 4.7‑litre 2UZ‑FE petrol V8 (UZJ100) uses two knock sensors mounted in the V of the block under the intake manifold. Toyota’s factory repair information lists DTCs P0325 (Bank 1) and P0330 (Bank 2) for these sensors and shows their installation in the valley beneath the plenum. By contrast, the 4.2‑litre 1HD‑FTE turbo‑diesel (HDJ100) does not use a knock sensor, the diesel engine control system documentation lists its sensors and inputs without any knock sensor, as ignition timing isn’t spark‑based on a diesel. Sources: Toyota Repair Manual UZJ100 – Engine Control (2UZ‑FE, DTC P0325/P0330) and Toyota Repair Manual HDJ100 – Engine Control System (1HD‑FTE sensor list).

Where the 2005 Land Cruiser is the 2UZ‑FE petrol, the knock sensor is a quiet hero. It listens for detonation (pinging) and lets the ECU trim ignition timing to protect the engine while keeping performance and fuel economy tidy. If it’s lazy or the wiring’s brittle, the ECU will pull timing as a safety net, and the big Cruiser can feel flat, drink more fuel, and light the MIL with P0325/P0330.

There’s no scheduled replacement interval for the knock sensors on a 2UZ‑FE, but they live in a hot valley under the intake, so age and heat can get to them. Whenever the intake manifold is off for other work, it’s smart preventative maintenance to inspect or replace both sensors and the sub‑harness. Use quality (OE‑equivalent) sensors, clean the mounting pads on the block, and torque the retaining bolts to spec with a torque spanner. The typical Toyota spec is in the 20 N·m range, but always check the exact figure in the service manual for the vehicle’s VIN. Don’t use sealant on the sensor face, and route the harness exactly as clipped to avoid induced noise.

Typical symptoms that point to knock sensor or harness trouble include:

• Check Engine light with P0325 and/or P0330
• Noticeable lack of power under load, especially up hills or towing
• Higher fuel use and a “heavy” feel
• Occasional pinging sound if the ECU can’t correct fast enough

Good workshop practice for a 2005 petrol Land Cruiser includes scanning for codes at each service, visually checking the intake valley area for coolant or oil leaks that can wick into the loom, and ensuring the engine mounts and exhaust heat shields are in good nick so false vibration doesn’t confuse the sensors. After any replacement, clear codes, perform a road test on quality 95–98 RON fuel, and verify that timing advance behaves normally under load via live data.

If the vehicle is the 1HD‑FTE turbo‑diesel, a knock sensor isn’t used. Diesels rely on compression ignition and manage combustion through fuel quantity, timing, and boost, the ECU uses inputs like crank position, manifold pressure, and temperature. Because there’s no spark timing to trim, a conventional petrol‑style knock sensor isn’t part of the diesel’s strategy.

Technical sources referenced: Toyota Repair Manual UZJ100 (2UZ‑FE) – Engine Control (DTC P0325/P0330) and Engine Mechanical – Knock Sensor Installation, Toyota Repair Manual HDJ100 (1HD‑FTE) – Engine Control System Sensor List and Wiring Diagrams.

Popular questions

Where is the knock sensor on a 2005 petrol Land Cruiser?
On the 2UZ‑FE V8 it sits in the engine’s V under the intake manifold—there are two sensors, one per bank. Access requires removing the upper intake, so many owners choose to replace both sensors and the sub‑harness in one go when the manifold is off.

Can a bad knock sensor damage the engine?
The ECU usually goes conservative and retards timing to protect the engine, so immediate damage is unlikely. But driving long‑term with a dead sensor or damaged loom can mask real detonation issues, cost power and fuel, and leave the engine without proper knock protection under heavy load or high heat. Best to fix it promptly.

Does the 1HD‑FTE diesel have a knock sensor?
No. The 1HD‑FTE turbo‑diesel doesn’t use a knock sensor. If a scan tool shows a P0325/P0330 on a diesel 100 Series, recheck the engine type and code definition—those are petrol V8 knock sensor codes.