AIUSLN Oxygen Sensor Downstream Bank 1 Sensor 2 for Toyota Camry 2018-2023 2.5L — Direct-Fit, 4-Wire

This downstream air–fuel ratio sensor monitors exhaust oxygen levels after the catalytic converter and supplies the vehicle’s engine control module with critical feedback for emissions and fuel-management adjustments. The AIUSLN unit matches factory connector and wiring length, uses a zirconia ceramic sensing element and stainless-steel housing, and is bench-tested to reduce early failures. Before ordering, confirm your vehicle year, engine displacement and sensor position to ensure fitment.

How do I know this fits my Toyota or Lexus?

Fitment depends on year, engine and the specific sensor location (downstream Bank 1 Sensor 2). This part fits many 2.5L gas and hybrid models across Toyota and some Lexus lines, but should be selected by original equipment number or by verifying the sensor’s position under your vehicle.

• Compatible models include Toyota Camry (2018–2023) 2.5L, RAV4 (2019–2024) 2.5L, Corolla 2.0L (2020–2022), Highlander, Sienna, Avalon, Venza, Crown and Grand Highlander hybrids where specified.
• Lexus fitment includes RX350h, NX250, NX350h and ES300h for listed years—confirm engine and sensor bank.
• Cross-references: 234-9304, 89467-06280, 89465-48430, 89465-33620, 89465-06370 and related OE numbers.

What are the installation steps and connector details?

The AIUSLN sensor is a direct plug-and-play replacement with a pre-matched connector and an 18.5" harness to reach the factory plug without cutting or splicing. Installation requires basic hand tools and anti-seize on the threads; follow torque specs to avoid damage.

• 4-pin, 4-wire oxygen sensor with factory-style connector—no wiring modifications needed.
• Recommended procedure: cool engine, disconnect battery, remove old sensor with 7/8" wrench, apply anti-seize, hand-thread then torque to 30–40 ft-lbs, reconnect and clear codes.
• If a check-engine light remains, inspect wiring, connectors and exhaust for leaks before replacing another sensor.

What performance and durability features does this sensor provide?

Built with a zirconia ceramic sensing core and 430L stainless-steel housing, this sensor is designed for reliable oxygen detection and resistance to heat and corrosion. AIUSLN tests each sensor with a 48-hour burn-in process to reduce early failure rates and promote longer service life.

• Fast response for consistent air–fuel ratio feedback and smoother engine behavior across driving conditions.
• Platinum-grid ceramic element and reinforced wiring for longevity under thermal stress.
• Manufacturing-tested for function and calibrated to match factory signal characteristics.

Will this help with fuel economy or drivability?

A properly functioning downstream oxygen sensor contributes to accurate emissions monitoring and helps the engine control system maintain optimal combustion. While it doesn’t independently change mileage, replacing a worn sensor can restore correct feedback to the ECU, reducing rough idle, hesitation and uneven performance caused by faulty readings.

• Restores accurate post-catalytic exhaust monitoring used for emissions diagnostics.
• Can smooth out transient hesitation and stabilize idle when faulty sensors are replaced.
• Supports correct ECU diagnostics and may prevent related drivability issues from persisting.

Who is this for: Technically inclined owners, independent mechanics and professional shops who need a reliable, OE-matching downstream oxygen sensor for Toyota and compatible Lexus 2.5L applications. Choose AIUSLN 234-9304 when you require a tested, direct-fit replacement with factory-style connector and robust materials—just verify vehicle year, engine and sensor bank before purchase.