Parts for your 2021 Toyota Land cruiser-Knock sensor

2021 Toyota LandCruiser knock sensor: relevant or not?

For Australia and New Zealand–spec 2021 Toyota LandCruiser 200 Series (VDJ200, 1VD‑FTV 4.5‑litre twin‑turbo diesel), a traditional petrol‑style knock sensor isn’t fitted or used. This conclusion aligns with Toyota Service Information (TIS) for the VDJ200/1VD‑FTV Engine Control System, which lists no knock sensor in the component diagram and includes no knock‑sensor diagnostic trouble codes (such as P0325 or P0330). The Toyota Electronic Parts Catalogue for the 2021 VDJ200 likewise shows no knock‑sensor part for the diesel. By contrast, the North American 2021 Land Cruiser with the 3UR‑FE 5.7‑litre petrol V8 does use two knock sensors and does set DTCs P0325/P0330—different engine, different hardware.

Why the difference? Diesel combustion isn’t spark‑ignited, so it doesn’t “ping” in the same way as a petrol engine. The 1VD‑FTV manages combustion via high‑pressure common‑rail injection, turbo boost, exhaust gas recirculation and precise ECU mapping. Instead of listening for knock to trim ignition timing (there is no spark timing to trim), the ECU uses inputs like crankshaft and camshaft position, fuel rail pressure, intake air mass/temperature and manifold pressure to shape injection timing and quantity. It also monitors crankshaft speed fluctuation to catch misfire or roughness, all without a classic piezo knock sensor.

What this means for owners is simple: there’s no knock sensor to service or replace on a 2021 AU/NZ LandCruiser 200 diesel. If there’s a rattle under load or a noise that sounds like “ping”, it’s typically normal diesel combustion clatter—or it can point to other issues such as injector wear, poor fuel quality, a boost leak, or carbon build‑up affecting EGR and swirl. The smart play is to stick with quality diesel, keep up with fuel filter intervals, and follow Toyota’s schedule for intake, EGR and injector checks. If a dash light pops up, a scan for diesel‑specific DTCs will steer diagnosis far better than chasing a non‑existent knock sensor.

• AU/NZ VDJ200 (1VD‑FTV diesel): no knock sensor fitted or required.
• US‑spec 3UR‑FE petrol: two knock sensors used for ignition control.

If there’s uncertainty about market spec, a quick check of the VIN in Toyota’s EPC or TIS will confirm the exact engine and sensor set‑up.

FAQs

Does a 2021 LandCruiser 200 (diesel) have a knock sensor?
No. The AU/NZ 1VD‑FTV diesel doesn’t use a knock sensor. Toyota’s workshop information for VDJ200 lists the engine sensors and DTCs, and there’s no knock‑sensor circuit on this platform.

Why do petrol LandCruisers use knock sensors but diesels don’t?
Petrol engines use knock sensors to detect pre‑ignition/“ping” and pull back spark timing. Diesels don’t have spark ignition, the ECU controls combustion with injection timing/quantity, boost and EGR. The 1VD‑FTV relies on those controls and other sensors, not a knock sensor.

Hearing a rattle under load—should the knock sensor be checked?
On the 1VD‑FTV there is no knock sensor to check. A pronounced rattle could be normal diesel clatter, but if it’s new or worse than usual, look to fuel quality, injector condition, boost or intake leaks, or EGR/intake deposits. A scan and a proper diesel diagnostic will pinpoint the cause.