Denso 234-4214 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4214

Denso 234-4214 is a specific-fit heated oxygen sensor built to OE-style dimensions and electrical requirements for direct replacement service. It is engineered for 1998-2000 Toyota RAV4 downstream applications and 1992-1997 Lexus SC300 downstream applications, with a 4-wire design and 25.59-inch wiring harness length for proper routing.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit design for direct replacement on listed vehicles
• 4-wire configuration for OE-style signal and heater circuit operation
• 25.59-inch wiring harness length for installation routing
• Built to OE standards for exact replacement fitment
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

OE Style Construction

Denso’s OE Style line is built for exact replacement service, with precision manufacturing aimed at first-time fitment and consistent sensor performance. This oxygen sensor is designed to help maintain proper air-fuel control and exhaust feedback on compatible Toyota and Lexus applications, including Toyota RAV4 downstream and Lexus SC300 downstream locations. Part number 234-4214 is a direct-fit option for technicians and owners replacing a worn or slow-responding sensor.

This part cross-references Bosch 13520 and NTK 24555 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Slow or inaccurate exhaust oxygen readings
• Reduced fuel economy from incorrect air-fuel feedback
• Rough idle or drivability issues tied to sensor degradation
• Contamination-related sensor failure from silicone or lead exposure

Installation Notes and Tips

Verify the downstream sensor location before ordering and match the connector, wire count, and harness length to the original part. On 1998-2000 Toyota RAV4 and 1992-1997 Lexus SC300 applications, confirm the exhaust routing and sensor position before installation. Use proper oxygen sensor service tools and inspect the connector and wiring for heat damage or corrosion during replacement.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The sensor’s protective trap layer is designed to help preserve the ceramic element and support long service life in demanding exhaust conditions.