TLYZSCGKZY Oxygen Sensor Pair for Toyota Camry & RAV4 2.4L (Upstream + Downstream) — Direct-Fit, OEM Replacement

TLYZSCGKZY upstream and downstream oxygen sensor pair for Toyota Camry (2004–2011) and RAV4 (2006–2008) is a direct-fit replacement set that monitors exhaust air-fuel mixture to help your engine run as intended.

This two-piece O2 sensor set includes one upstream (pre-catalytic converter) and one downstream (post-catalytic converter) sensor engineered to match the OE fitment and electrical connector for the listed Toyota 2.4L applications. Each sensor is designed from durable materials and tested to detect air–fuel ratios accurately, making them suitable for routine maintenance or when a check-engine light indicates oxygen-sensor faults. Before ordering, confirm your vehicle’s year, engine, and original part numbers to ensure compatibility.

How will these sensors affect engine performance?

Oxygen sensors provide the ECU with exhaust gas composition data. When functioning correctly, they help the engine control module maintain proper air–fuel balance, which supports smoother idling and stable acceleration. Replacing worn sensors can restore expected responsiveness and reduce erratic fuel trims.

• Direct-fit wiring and connector match for listed Toyota models.
• Upstream sensor measures immediate exhaust mixture for fuel control.
• Downstream sensor monitors catalytic converter efficiency.
• Durable construction resists high exhaust temperatures.

Are these the correct replacement part numbers for my Toyota?

This kit replaces common OEM references: upstream 234-9049 (2349049) and downstream 234-4622 (2344622). Use those part numbers and your vehicle year/engine to verify fitment before purchase. If your vehicle shows different sensor part numbers, compare connectors and thread size to confirm compatibility.

• Replaces OEM upstream 234-9049 and downstream 234-4622 part numbers.
• Intended for 2.4L Camry (2004–2011) and RAV4 (2006–2008).
• Check vehicle-specific fitment details at the top of the product page.
• Compare sensor connector and thread pitch if unsure.

How difficult is installation and what tools will I need?

Installation is typically straightforward for a mechanically inclined DIYer; sensors are threaded into the exhaust and connected to the factory wiring harness. Most replacements require basic hand tools and possibly an oxygen sensor socket for removal. Always allow the exhaust to cool and follow torque recommendations to prevent damage.

• Oxygen sensor socket or 22mm wrench recommended.
• Penetrating oil helps free seized sensors.
• Disconnect battery before unplugging electrical connectors.
• Torque to manufacturer specs after hand-threading to avoid cross-threading.

What testing or quality checks were performed on these sensors?

Each sensor in the set undergoes electrical and response testing to verify it reports exhaust oxygen levels accurately. Testing ensures the sensor responds to changing air–fuel ratios and that connectors meet expected continuity and sealing standards. While not OEM-branded, these sensors aim to meet performance benchmarks for aftermarket replacements.

• Electrical continuity and response-time checks performed.
• High-temperature tolerance tests to simulate exhaust conditions.
• Connector fit and sealing validation for reliable operation.
• Bench verification of output signal behavior under simulated loads.

Who is this for: This TLYZSCGKZY oxygen sensor pair is for Toyota owners and mechanics seeking a cost-effective, direct-fit upstream/downstream replacement for 2.4L Camry (2004–2011) and RAV4 (2006–2008) models. It suits DIY installers comfortable with basic auto repair and shops that need dependable aftermarket sensors to restore proper engine management or resolve OBD-II oxygen sensor trouble codes.