Parts for your 2015 Toyota Land cruiser-Knock sensor

2015 Toyota Land Cruiser Knock Sensor — What It Does and When To Sort It

Based on Toyota technical literature, the 2015 Land Cruiser 200 Series is fitted with knock sensors on its V8 engines. The Toyota Repair Manual and New Car Features documents for the 3UR-FE/1UR-FE petrol engines describe dual knock sensors (one per bank) and include diagnostics such as DTCs P0327/P0328/P0332. The Toyota Electrical Wiring Diagram for the 200 Series also shows KS circuits (often labelled KNK1/KNK2) to the engine ECU. For markets running the 1VD-FTV V8 diesel, Toyota’s engine control overview similarly details knock sensing used for combustion control. So yes, the knock sensor is relevant and used on the 2015 Toyota Land Cruiser.

On a 2015 Land Cruiser, the knock sensor’s job is to “listen” for abnormal combustion (detonation). When it detects that sharp vibration signature, it signals the ECU to gently pull ignition timing (and tweak fuelling on some variants) to protect the engine while keeping power smooth. That means better reliability when towing, touring outback, or climbing alpine roads on average Aussie and Kiwi fuels.

In most cases, these sensors live in the V of the engine, one per bank, and are connected by a dedicated sub-loom. They’re robust, so there’s no routine replacement interval. Instead, replacement is driven by symptoms or fault codes. Common clues include a check engine light with knock sensor DTCs, unexpectedly flat performance, poor economy, and pinging under load. Because access typically requires intake manifold removal, it’s smart to test properly first and, if replacement is needed, use genuine-spec parts and renew any brittle connectors or gaskets while you’re there.

Good servicing habits that help the knock sensor do its thing:

• Run quality fuel and keep to recommended octane for petrol models, use reputable diesel to minimise combustion noise issues.
• Fix intake, exhaust, or engine-mount rattles that can mimic knock and confuse diagnostics.
• Address oil or coolant leaks in the valley before they soak the sensor or sub-loom.
• If the intake must come off for other work, consider preventative inspection of the sensor harness and clips.

When replacing, clean the mounting surface, route the harness exactly as per the Toyota repair manual, and torque the sensor bolt(s) to the specified value. After refit, clear codes and perform a proper road test under load to confirm the ECU’s knock control is behaving normally.

Popular questions about 2015 Toyota Land Cruiser knock sensors

Where is the knock sensor located on a 2015 Land Cruiser?
On the V8 engines used in 2015 models, the knock sensors are mounted on the engine block within the valley between the cylinder banks, typically one per bank. Access usually means removing the intake manifold and associated hardware, so it’s a bit more than a driveway job unless you’re well tooled-up.

What symptoms show a failing knock sensor on this model?
Expect a check engine light with knock sensor codes, reduced power, rougher running under load, and sometimes worse fuel economy. The ECU may retard timing to protect the engine, which can make the vehicle feel sluggish. Always rule out fuel quality and mechanical rattles before condemning the sensor.

Do knock sensors need routine replacement?
No routine interval is specified. They’re replaced when testing confirms a fault or when damage or corrosion is found during related repairs. If the intake is already off for major servicing, it’s wise to inspect the sensors and sub-loom and refresh gaskets and clips as needed.