Parts for your 2021 Toyota Land cruiser-Spark plugs

2021 Toyota LandCruiser spark plugs: are they used and what to know

For Australia and New Zealand buyers, the 2021 Toyota LandCruiser doesn’t use spark plugs. Local 2021 LandCruiser models were diesel-powered: either the late-run 200 Series with the 4.5‑litre V8 twin‑turbo diesel (1VD‑FTV) or the early 300 Series with the 3.3‑litre V6 twin‑turbo diesel (F33A‑FTV). Both engines are compression‑ignition designs, so they rely on very high compression and precise fuel injection to ignite the mixture—no spark required. This is outlined in Toyota’s model specifications and engine repair manuals for the 1VD‑FTV and F33A‑FTV, as well as the owner’s literature that refers to glow plugs and intake air heaters rather than spark plugs.

Why no spark plugs? In a diesel, air is compressed until it’s hot enough to auto‑ignite the injected diesel fuel. Spark plugs would serve no purpose because there’s no throttle‑controlled air/fuel mix waiting for an ignition spark like in a petrol engine. Instead, diesels use glow plugs to assist cold starts by warming the combustion chamber, and then run purely on heat from compression and fuel injection timing.

If someone’s dealing with a privately imported 2021 petrol LandCruiser (like the Middle‑East–market 5.7‑litre 3UR‑FE V8 or certain 300 Series petrol V6 variants), those do use spark plugs. In that case, they should follow the plug type and change interval listed in the relevant Toyota owner’s manual and repair manual for that exact engine code. For AU/NZ‑delivered vehicles though, asking for spark plugs on a 2021 LandCruiser will have the parts interpreter pointing them to glow plugs or diesel servicing instead.

• What to service instead of spark plugs: glow plugs and their control system, batteries and cranking performance, diesel injectors and fuel filters, air intake and intercooler plumbing, and scheduled oil and filter changes.
• Signs the diesel needs attention: hard cold starts, excessive cranking, rough idle when cold, white smoke on start, or glow plug warning messages.

Popular questions

Does a 2021 LandCruiser have spark plugs?
No, not on AU/NZ‑spec vehicles. The 2021 LandCruiser here is diesel (1VD‑FTV V8 or F33A‑FTV V6), which uses compression ignition and glow plugs for cold starts. Spark plugs are only found on petrol variants sold in other markets.

What should be checked instead of spark plugs on my 2021 diesel LandCruiser?
Have the glow plugs and their relay/control checked, ensure the battery and starter are healthy, and keep up with diesel fuel filter changes. Good quality diesel and timely injector servicing help with smooth starts and reduced smoke.

I’ve got an imported 2021 petrol LandCruiser—how often should I change spark plugs?
Intervals depend on the engine (for example, 3UR‑FE V8 or the petrol V6 in some 300 Series grades). Most Toyota petrol engines with iridium plugs run long intervals—often around 160,000 km—but always follow the plug spec and schedule in the exact Toyota owner’s manual and repair manual for that engine.