TLYZSCGKZY Oxygen Sensor Kit for Toyota Camry & RAV4 2.4L (2-Piece Upstream & Downstream) OEM Fit, Direct Replacement

This 2-piece oxygen sensor set (upstream and downstream) from TLYZSCGKZY replaces part numbers 234-9049 and 234-4622 for Toyota Camry and RAV4 2.4L models, restoring accurate air-fuel sensing to help your engine run more smoothly.

If your vehicle shows reduced fuel efficiency, rough idling, or a check engine light tied to O2 sensor codes, this paired upstream and downstream sensor kit is built to be a direct-fit replacement for many Toyota models listed. Each sensor is manufactured to match OEM fitment and electrical interfaces so installation is straightforward. The pair covers both the pre-catalytic (upstream) and post-catalytic (downstream) monitoring positions, letting the engine control unit accurately adjust mixture and check converter performance.

Will these sensors fit my Camry or RAV4?

These oxygen sensors are designed for Toyota gasoline 2.4L engines in specific model years. Confirm compatibility using your vehicle year and engine size before purchase.

• Fitment: Toyota Camry 2004–2011 with 2.4L engine
• Also fits: Toyota RAV4 2006–2008 with 2.4L engine
• Replace numbers: upstream 234-9049 (2349049) and downstream 234-4622 (2344622)
• Double-check connector shape and wiring against your original sensor

How do upstream and downstream sensors differ, and why buy both?

The upstream sensor sits before the catalytic converter and monitors exhaust oxygen to manage fuel trimming; the downstream sensor sits after the converter and verifies converter efficiency. Replacing both at once gives consistent readings and helps avoid mismatched sensor performance.

• Upstream: controls air-fuel ratio via ECU feedback
• Downstream: monitors catalytic converter operation
• Replacing both prevents diagnostic confusion and uneven wear
• Sold as a matched 2-piece set for convenience

What performance changes can I expect after installing these sensors?

Fresh oxygen sensors provide more accurate air-fuel information to the engine control unit, which can improve drivability and fuel metering. While results depend on overall vehicle condition, many owners notice steadier idle and more consistent throttle response.

• More stable idle and smoother acceleration
• Improved fuel management compared to failing sensors
• Helps prevent premature catalytic converter stress from poor mixtures
• May help clear OBD-II codes when the underlying sensor fault is resolved

Is installation difficult and what should I prepare?

Installation is generally straightforward for a mechanically inclined DIYer and similar to OEM replacement — the kit matches factory thread and connector. Use anti-seize where appropriate, torque to manufacturer specs, and consider replacing sensors when performing exhaust or catalytic service.

• Tools: O2 sensor socket, ratchet, torque wrench recommended
• Disconnect battery and allow exhaust to cool before servicing
• Inspect harness and connector for corrosion before connecting
• Professional installation is recommended if you lack experience

Who this is for: This TLYZSCGKZY oxygen sensor pair is intended for Toyota owners, DIY mechanics, and independent repair shops needing a cost-effective, direct-fit upstream and downstream O2 sensor replacement for Camry (2004–2011) and RAV4 (2006–2008) 2.4L models. Choose this set if you want matched sensors to restore accurate exhaust sensing, address OBD-II air/fuel or converter codes, and maintain reliable engine management. Always verify part numbers and connector compatibility with your vehicle before ordering.