Denso 234-2004 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-2004

This Denso OE Style oxygen sensor is built for direct replacement on specific Mazda applications, including the 1990-1993 Mazda B2200 upstream and 1989-1993 Mazda B2600 upstream. The Denso 234-2004 is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on the listed vehicles.

Key Features

• OE Style replacement oxygen sensor for specific Mazda fitment
• Non-heated sensor design with 2-wire configuration
• Female connector and threaded mounting type
• Wiring harness length: 43.82
• Thread diameter: 0.708
• Built and tested to OE standards for direct replacement use
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-2004 is part of the OE Style line, which focuses on exact replacement fit and factory-style performance. This oxygen sensor is designed for upstream placement on the Mazda B2200 and Mazda B2600 listed above, making it a direct choice for drivers replacing a worn sensor on these older fuel-injected applications. The sensor’s non-heated, threaded design and specific-fit connector help simplify matching the original equipment layout.

This part cross-references Bosch 12019 and NTK 24012 for the same application.

What This Sensor Helps Address

• Check engine light caused by oxygen sensor failure
• Rough idle or inconsistent air-fuel control
• Reduced fuel economy from inaccurate exhaust readings
• Slow sensor response affecting engine management
• Emissions test failure related to a faulty upstream sensor

Installation Notes and Tips

Verify the upstream sensor location before installation and confirm connector style, thread diameter, and harness length against the original part. The Denso 234-2004 is a specific-fit sensor for the listed Mazda B2200 and Mazda B2600 applications, so matching the original mounting and wiring layout is important for proper installation. Inspect the exhaust bung threads and surrounding wiring before replacement.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards. The design emphasizes exact replacement fit, consistent sensor output, and protection of the sensing element for long service life.