Denso 234-2003 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-2003

Denso 234-2003 is an OE Style oxygen sensor built for specific-fit replacement on select Toyota and Geo applications. It is a non-heated, threaded sensor with a male connector and 18.82-inch wiring harness length for direct replacement service.

Key Features

• OE Style replacement oxygen sensor for precise fit and function
• Non-heated sensor design with 2-wire configuration
• Specific fit for easier application matching
• Threaded mounting type with 0.708-inch thread diameter
• 18.82-inch wiring harness length for routing flexibility
• Male connector for direct connection on listed applications

Product Details

This Denso oxygen sensor is manufactured and tested to OE standards, with precision-built dimensions for first-time fitment. The OE Style line uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life. Part number 234-2003 is used on select 1995-1997 Geo Prizm upstream applications, 1995-1997 Toyota Corolla upstream applications, and 1992-1995 Toyota MR2 downstream applications.

This part cross-references Bosch 12108 and NTK 24505 for the same application.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Poor fuel economy caused by a worn sensor
• Slow or unstable sensor response in emission control monitoring
• Replacement needs on aging Geo Prizm, Toyota Corolla, and Toyota MR2 exhaust systems

Installation Notes and Tips

Verify the sensor position before ordering: this application covers upstream and downstream locations depending on vehicle and year. Confirm the threaded mounting style, 2-wire connector layout, and harness length against the original sensor before installation. For best results, inspect the exhaust bung threads and wiring route during replacement.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit consistency. The design focuses on exact-match dimensions and contamination resistance for dependable service on the listed Toyota and Geo applications.