Denso 234-4060 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4060

Denso 234-4060 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is designed for specific applications on Suzuki, Geo, Pontiac, Chevrolet, and related vehicles, including upstream locations on the Suzuki Esteem and Suzuki Sidekick.

The OE Style line focuses on direct-fit replacement parts that match factory requirements. For drivers searching for an upstream oxygen sensor for a 1995-2002 Suzuki Esteem or a 1996-1998 Suzuki Sidekick, this Denso oxygen sensor provides the correct fitment profile and connector style for the listed applications.

• Heated oxygen sensor for upstream placement
• Specific fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 thread diameter
• Wiring harness length: 21.26
• Built to OE standards for replacement accuracy
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

OE-Style Replacement Details

Denso 234-4060 is engineered as an OE-style oxygen sensor for emissions control systems that require precise signal response and proper upstream placement. The heated design helps the sensor reach operating temperature quickly, supporting stable feedback to the engine management system. This part cross-references Bosch 13073 and NTK 21508 for the same application.

Compatible With 1995-2002 Suzuki Esteem, upstream; 1998 Chevrolet Tracker, upstream; 1996-1998 Suzuki Sidekick, upstream; 1996-1998 Suzuki X-90, upstream; 1996-1997 Geo Tracker, upstream; and 1996-1997 Pontiac Sunrunner, upstream. Additional listed coverage includes California exempt applications for select Geo Tracker, Pontiac Sunrunner, and Suzuki Sidekick models, plus 1992-1993 Suzuki Sidekick hardtop vehicles only.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture feedback at the upstream sensor
• Reduced fuel economy caused by a worn sensor
• Slow sensor response during closed-loop operation
• Emissions test failures tied to a faulty upstream O2 sensor

Installation Notes and Tips

Verify the vehicle year, make, model, and upstream position before ordering. Confirm the connector style, 4-wire layout, and threaded mounting dimensions against the original sensor. For 1992-1993 Suzuki Sidekick applications, this part is for hardtop vehicles only and does not fit convertible models.

Because oxygen sensors are exposed to heat and corrosion, inspect the harness routing and connector condition during replacement. Use the exact application listing for your vehicle, including California exempt notes where shown. Denso 234-4060 is also a direct-fit choice for shoppers looking for a Suzuki Esteem oxygen sensor or Suzuki Sidekick upstream O2 sensor.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for replacement accuracy and fit. The design includes contamination protection for the sensing element, supporting long service life and consistent engine management performance.