Parts for your 2021 Toyota Camry-Oxygen sensor

2021 Toyota Camry Oxygen Sensor: Purpose, Care, and When to Replace

Technical sources confirm the 2021 Toyota Camry is fitted with oxygen-sensing hardware. Toyota’s Repair Manual for the A25A (2.5‑litre) and 2GR (3.5‑litre) engines specifies upstream air–fuel ratio (A/F) sensors and downstream oxygen (O2) sensors, while the Toyota Electronic Parts Catalogue lists Bank 1 Sensor 1 (A/F) and Bank 1 Sensor 2 (O2), with additional Bank 2 sensors on V6 models. Emissions and OBD requirements under ADR 79/04/Euro 5 and SAE J1979 also necessitate closed‑loop lambda feedback. So yes—this Camry absolutely runs oxygen sensors.

On this model, the upstream A/F sensor continuously measures exhaust oxygen so the engine control unit can trim fuel on the fly. That keeps the mixture right on the money for smooth running, top fuel economy, and minimal emissions. The downstream O2 sensor sits after the catalytic converter to verify the cat’s doing its job and to flag any efficiency drop. Together, they protect the catalyst, prevent over-fuelling, and help the Camry sip petrol rather than slurp it.

• Typical fitment: 2.5‑litre models have two sensors (one A/F, one O2). The 3.5‑litre V6 uses four (two A/F, two O2—one set per bank).

They’re not a regular “every service” replacement item, but they do age. Expect long service life—often 160,000–240,000 kilometres—depending on fuel quality, driving conditions, and engine health. During routine servicing, it’s smart to scan for stored fault codes (think P0133, P0137, P0420), check the harness and plugs for heat damage, and make sure there are no exhaust leaks upstream of the sensors that could skew readings.

• Common clues they’re on the way out: noticeable jump in fuel use, rough idle, hesitant acceleration, a whiff of sulphur, or the Check Engine light.

If replacement’s needed, go for quality (OE‑equivalent Denso is the usual pick for Toyota). Use an O2 sensor socket, avoid twisting the loom, and install to the torque spec in the Toyota manual. Most new sensors come pre‑coated, only use the correct anti‑seize if specified. After fitting, clear codes and confirm trims and catalyst monitors are happy on a short road test.

Whether it’s a hybrid or a conventional petrol Camry, keeping the oxygen sensors healthy keeps the cat healthy, the wallet happier at the bowser, and the drive feel crisp. That’s a win all round for Australian and New Zealand roads.

Popular questions about 2021 Toyota Camry oxygen sensors

How many oxygen sensors does a 2021 Camry have?
Most 2.5‑litre four‑cylinder cars have two sensors—an upstream A/F sensor and a downstream O2 sensor. V6 models have four, with one A/F and one O2 sensor per bank. Hybrids follow the four‑cylinder layout with two sensors.

This layout lets the engine fine‑tune fuelling and also keeps tabs on catalytic converter efficiency.

How often should oxygen sensors be replaced on a 2021 Camry?
They’re generally replaced on condition, not a fixed interval. Many last 160,000–240,000 km. Replace sooner if there are fault codes, fuel economy drops, drivability issues appear, or a technician confirms slow or faulty sensor response.

Regular scans during servicing and fixing any exhaust leaks will help them last.

Is it safe to drive with a bad oxygen sensor?
Short term, the car will usually keep running, but fuel economy and performance can suffer, and the catalytic converter may be put at risk. Prolonged driving with a failed sensor can shorten catalyst life and cost more later.

Best bet: book it in promptly for diagnosis and repair.