Denso 234-4623 Oxygen Sensor - Downstream or Upstream

Denso 234-4623 Oxygen Sensor Overview

Denso 234-4623 is an OE Style heated oxygen sensor built for specific downstream and upstream applications across Toyota, Lexus, Scion, Pontiac, and GMC platforms. It is engineered for exact replacement fitment, stable signal performance, and reliable exhaust monitoring on vehicles such as the Toyota Prius, Toyota Camry, and Lexus GS300.

Key Features

• Heated oxygen sensor with specific fitment for direct replacement applications
• OE Style design for factory-like mounting and connector compatibility
• Threaded mounting type with a 0.708 in. thread diameter
• 4-wire configuration with male connector
• 23.23 in. wiring harness length for application-specific routing
• Built to Denso OE standards with precision construction
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Detailed Description

Denso 234-4623 is designed for drivers and repair shops replacing a worn oxygen sensor on emissions-controlled vehicles that require a specific-fit, heated sensor. As part of Denso’s OE Style line, this sensor is built to match the original part’s form, connector layout, and threaded installation points for a first-time fit on the correct application. The sensor’s protective trap layer is intended to help shield the sensing element from contamination, supporting consistent exhaust feedback and dependable engine management. This part cross-references Toyota 8946501090 and Bosch 13353 for the same application.

Compatible With 2001-2009 Toyota Prius, downstream; 2003-2006 Toyota Matrix, downstream; 2000-2005 Toyota Celica, downstream; 1994-1996 Toyota Camry, downstream; 1995-1997 Lexus GS300, downstream; and 2008-2014 Scion xD, downstream. It also applies to Lexus GS430, GS400, GS460, ES300, Toyota Sienna, Supra, and Pontiac Vibe applications listed in the fitment data. The Denso 234-4623 is a practical replacement choice when the original sensor has aged, contaminated, or stopped reporting accurately.

What It Is Used For

• Replacing a failed downstream oxygen sensor on Toyota, Lexus, Scion, Pontiac, or GMC applications
• Restoring proper air-fuel feedback to the engine control system
• Addressing check engine light conditions related to oxygen sensor performance
• Correcting poor fuel economy caused by inaccurate exhaust readings
• Resolving drivability issues tied to slow or inconsistent sensor response

Installation Notes and Tips

Verify the connector style, wire count, thread diameter, and sensor position before installation. This is a specific-fit, threaded sensor, so matching the exact year, make, model, and downstream or upstream location is important. For 1998 Toyota Supra applications, this sensor is listed for the upstream position on cylinder 4, 5, and 6. Use the vehicle’s original routing path for the 23.23 in. harness and confirm the exhaust bung threads are clean before tightening.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and performance. The OE Style construction is intended to deliver the correct part and the correct fit for the listed applications, including Toyota Camry, Toyota Prius, and Lexus GS300 fitments.