Denso 234-1009 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Denso OE Style Oxygen Sensor 234-1009

Denso 234-1009 is an OE Style oxygen sensor built for direct replacement on select Honda, Acura, Suzuki, and related applications. It is a specific-fit, threaded sensor with a female connector and 18.82-inch wiring harness length for straightforward replacement on upstream locations.

For drivers searching for an oxygen sensor for 1988-1991 Honda Civic upstream, 1984-1990 Honda Prelude upstream, or 1986-1990 Acura Legend upstream left, this Denso part is built to match the original configuration and connector style.

Key Features

• OE Style replacement oxygen sensor for specific applications
• Non-heated sensor design
• Specific fit for direct replacement
• 18.82-inch wiring harness length
• Female connector with 1-wire configuration
• Threaded mounting type with 0.708-inch thread diameter
• Built to strict OE standards for fit and function
• Includes Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-1009 is part of the OE Style line, which focuses on exact replacement fitment and original-style performance. The sensor is precision built for applications that require a non-heated, threaded oxygen sensor with a single wire and female connector. This makes it a direct-match option for older Honda Accord, Civic, CRX, Prelude, Acura Integra, Acura Legend, Suzuki Samurai, Suzuki Sidekick, and related upstream positions listed in the fitment data.

This part cross-references Bosch 12050 and NTK 24033 for the same application. The Denso oxygen sensor is engineered to help maintain proper air-fuel feedback, which is important for engine performance and fuel economy in emissions-controlled systems.

Common Issues This Part Can Address

• Faulty upstream oxygen sensor readings
• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent fuel mixture control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Emissions test failures tied to sensor degradation

Installation Notes and Tips

Fits 1985-1995 Suzuki Samurai, upstream; 1988-1991 Honda Civic, upstream; 1988-1991 Honda CRX, upstream; 1988-1990 Acura Integra, upstream; 1986-1990 Acura Legend, upstream left; 1989-1990 Chevrolet Tracker, upstream; 1989-1990 Geo Tracker, upstream; 1989-1990 GMC Tracker, upstream; 1984-1990 Honda Prelude, upstream; 1989-1990 Suzuki Sidekick, upstream; 1986-1989 Honda Accord, upstream; 1984-1989 Honda Accord, upstream; 1986-1987 Honda Accord, upstream right; 1985-1986 Chevrolet Sprint, upstream; 1985-1986 Pontiac Firefly, upstream; 1985-1986 Suzuki Forsa, upstream.

Verify the upstream position, connector style, and thread size before installation. Because this is a specific-fit sensor, matching the original application details is important for proper installation on Honda Accord, Honda Civic, and Acura Legend applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards, with precision-built components intended to match the original replacement fit. The aluminum oxide trap layer adds protection for the sensing element against silicone and lead contamination, supporting long-term sensor durability in normal emissions-system service.