Denso 234-3004 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-3004

Denso 234-3004 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for specific applications on Geo Tracker, Pontiac Sunrunner, Chevrolet Tracker, and GMC Tracker models with upstream placement.

The Denso OE Style line focuses on direct-fit replacement parts that match original equipment requirements. This oxygen sensor uses a threaded mounting design, a male connector, 3 wires, and a 15.43-inch wiring harness length for a clean, application-specific installation.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific-fit design for direct replacement
• Threaded mounting type with 0.708-inch thread diameter
• 3-wire configuration with male connector
• 15.43-inch wiring harness length
• OE Style construction for factory-like fit and function
• Built to Denso’s OE-level testing and precision standards

Detailed Description

This Denso oxygen sensor is designed for upstream exhaust locations on 1991-1994 Geo Tracker, 1991-1994 Chevrolet Tracker, 1991-1994 GMC Tracker, and 1994 Pontiac Sunrunner applications listed below. It is a direct replacement for vehicles that require a heated, threaded, specific-fit sensor with the correct connector and wire count. Part number 234-3004 is also a practical cross-reference for OE-style replacement searches, and this part cross-references Bosch 15701 for the same application.

Denso’s OE Style oxygen sensors are precision built to match original equipment dimensions and electrical requirements. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life. Search terms such as upstream oxygen sensor for 1991 Chevrolet Tracker, 1993 Geo Tracker upstream O2 sensor, and 1994 Pontiac Sunrunner oxygen sensor all point to this direct-fit replacement.

What It Helps Address

• Check engine light caused by a failing upstream oxygen sensor
• Rough idle or inconsistent air-fuel feedback
• Poor fuel economy from inaccurate exhaust oxygen readings
• Slow sensor response affecting engine control performance
• Replacement needs on OE-style Geo Tracker, Chevrolet Tracker, GMC Tracker, and Pontiac Sunrunner applications

Installation Notes and Tips

Verify upstream placement before ordering and confirm the connector, wire count, and thread size match the original sensor. This part is specific fit, so compare the existing sensor to the vehicle listing for 1991-1994 Geo Tracker, 1991-1994 Chevrolet Tracker, 1991-1994 GMC Tracker, and 1994 Pontiac Sunrunner applications. Use proper exhaust sensor removal tools and inspect the harness routing before installation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for accurate replacement fitment and dependable operation. The OE-style design is intended to match factory specifications for the listed Tracker and Sunrunner applications, with Denso’s contamination-resistant sensor protection built into the design.