QIYBONE Oxygen O2 Sensor Kit for Toyota 2.5L — Upstream & Downstream 2PCS, OEM-fit Stainless Steel

QIYBONE's two-piece oxygen (O2) sensor kit provides direct-fit upstream and downstream sensors engineered for 2.5L Toyota/Lexus/Scion engines to restore accurate air‑fuel readings and reliable exhaust monitoring.

This replacement kit includes an upstream and a downstream O2 sensor built to OEM-style specifications for Toyota Camry (2012–2017 2.5L), RAV4 and Avalon (2013–2018 2.5L), Lexus ES300h (2013–2018 2.5L) and Scion tC (2011–2016 2.5L). Each sensor uses stainless steel construction and high‑temperature materials with enhanced sealing to resist exhaust conditions and provide long service life. The plug-and-play connectors match factory wiring so installation is straightforward for professional mechanics and competent DIYers alike.

How do these sensors improve my vehicle's performance?

Oxygen sensors measure exhaust oxygen content so the engine control module can balance air and fuel correctly. Replacing failing sensors restores accurate feedback, helping the engine run closer to its intended efficiency and emissions profile.

• Upstream sensor monitors combustion mixture for real-time fuel trim adjustments.
• Downstream sensor verifies catalytic converter effectiveness and emissions.
• Faster response time helps reduce rough idling and missed shifts caused by incorrect fuel trim.

Which vehicles and part numbers are these sensors compatible with?

This QIYBONE pair fits specific 2.5L L4 engines across Toyota, Lexus and Scion model years listed. Always compare the connector and mounting thread to your original sensor before ordering to ensure a match.

• Compatible models: Camry (2012–2017), Avalon (2013–2018), RAV4 (2013–2018) — excluding hybrid variants where noted.
• Also fits: Scion tC (2011–2016) and Lexus ES300h (2013–2018) with 2.5L L4 engines.
• Reference numbers: upstream 250-54084 (350-64031, OS5579) and downstream 250-24360 and related OE equivalents for cross-reference.

How difficult is installation, and what should I check first?

QIYBONE sensors are designed to the original equipment plug-and-play form, so installation is typically quick. However, you should verify connector type, thread pitch and sensor location before replacing to avoid compatibility issues.

• Turn off the vehicle and let the exhaust cool before removal to avoid burns.
• Compare the factory sensor’s plug and threads with the new product images to confirm fitment.
• Use an oxygen sensor socket for removal and torque to OEM specifications on installation.

What are the construction and durability features of this QIYBONE kit?

The sensors combine stainless steel bodies with high‑temperature resistant elements and reinforced sealing to withstand exhaust heat and contaminants. These design choices extend service life and keep readings stable under harsh driving conditions.

• Stainless steel housing for corrosion resistance and structural durability.
• High‑temperature internals for sustained performance in hot exhaust streams.
• Double protection sealing to limit exhaust leaks and wiring exposure.

Who is this for: This two-piece QIYBONE sensor set is aimed at owners and technicians who need a reliable, cost-effective replacement for failing oxygen sensors on 2.5L Toyota, Lexus and Scion models. It suits DIY mechanics who can perform sensor swaps and professional shops that require a direct-fit aftermarket option with broad OE reference numbers for quick cross-referencing. If your vehicle shows an O2 sensor fault code, reduced fuel economy, or failed emissions checks, this kit offers a practical replacement choice that matches common factory specifications.