Parts for your 2021 Toyota Land cruiser-Oxygen sensor

2021 Toyota Land Cruiser oxygen-sensor: is it fitted and what to know

Checking Toyota’s factory repair information and the Toyota Electronic Parts Catalogue for the 200 Series (2021 model year) shows a clear split: petrol variants (such as the US‑market 3UR‑FE 5.7L V8) are fitted with oxygen-sensors — specifically two upstream air‑fuel ratio sensors and two downstream O2 sensors for catalyst monitoring — while Australia and New Zealand–market 2021 Land Cruiser models (1VD‑FTV 4.5L twin‑turbo diesel) are not equipped with an oxygen-sensor.

Why no oxygen-sensor on the local diesel? Modern Toyota diesels run very lean by design and manage fuel delivery using the MAF, MAP, rail pressure and injector control, with emissions handled by EGR and a DPF system (and, depending on market, additional NOx control). Instead of a traditional lambda sensor, the diesel setup relies on exhaust gas temperature probes, a DPF differential pressure sensor and one or more NOx sensors to keep emissions in check and to supervise DPF regeneration. That’s why you won’t find an oxygen-sensor listed for AU/NZ 2021 Land Cruiser diesels in the parts catalogue or diagnostic manuals.

For owners, that means “O2 sensor” fault symptoms you might read about overseas don’t really apply to a 2021 Aussie or Kiwi Land Cruiser diesel. If there’s a check engine light, rough running, high fuel use or frequent regens, the usual culprits are different sensors in the exhaust stream or air‑intake, not an oxygen-sensor.

• Common diesel sensors to check: NOx sensor(s), DPF differential pressure sensor, exhaust gas temperature sensors, MAF sensor, and intake leaks.
• Good servicing habits: use low‑ash diesel oil, keep the air filter and MAF clean, ensure the exhaust is leak‑free ahead of the DPF, and give the vehicle regular highway runs to support proper DPF regeneration.
• Diagnostics tip: scan for stored codes — diesel‑specific faults often flag as P2XXX (NOx/DPF) or EGT‑related rather than classic O2 sensor codes like P0130–P0161.

If you’ve imported a petrol 2021 Land Cruiser, different story — that engine does use oxygen-sensors, and maintenance will include monitoring upstream A/F sensors and downstream O2 sensors for ageing or contamination. For AU/NZ‑delivered diesels, though, an oxygen-sensor simply isn’t part of the hardware.

Popular questions about the 2021 Toyota Land Cruiser oxygen-sensor

Does the 2021 Toyota Land Cruiser in Australia or New Zealand have an oxygen-sensor?
No — the local 1VD‑FTV diesel isn’t fitted with an oxygen-sensor. Toyota’s service manuals and parts catalogues for the AU/NZ 200 Series show DPF, EGT, pressure and NOx sensors instead. Overseas petrol models do use oxygen-sensors.

What gives “bad O2 sensor” symptoms on a 2021 Land Cruiser diesel?
On the diesel, similar symptoms (check engine light, poor economy, sluggish performance) are more likely from a failing NOx sensor, clogged DPF, faulty DPF pressure sensor, tired EGT sensor, dirty MAF or an intake/exhaust leak. A scan with a proper tool will point to the exact circuit.

How many oxygen-sensors are on a 2021 Land Cruiser petrol, and when should they be replaced?
Petrol models typically have four sensors: two upstream air‑fuel ratio sensors and two downstream O2 sensors. There’s no fixed interval, replace when fault codes appear, fuel economy drops or after high kilometres (often 150–200k) if diagnostics show slow response. Use the correct Denso/Toyota‑spec parts.