Denso 234-2002 Oxygen Sensor - Upstream

OE-Style Oxygen Sensor for Select Hyundai and Mitsubishi

Denso 234-2002 is an OE-style oxygen sensor built for specific upstream applications on select Hyundai, Mitsubishi, Dodge, and Plymouth vehicles. It uses a non-heated, 2-wire design with a threaded mount and male connector for a direct-fit replacement on the listed applications.

Built to strict OE standards, this Denso oxygen sensor is precision made for first-time fit and consistent signal performance. The aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination, supporting stable engine operation and fuel control.

Key Features

• OE-style replacement oxygen sensor for specific upstream locations
• Non-heated sensor design with 2-wire configuration
• Threaded mounting type with 0.708 in. thread diameter
• Male connector and 25.79 in. wiring harness length
• Precision-built for exact replacement fit on listed applications
• Aluminum oxide trap layer helps protect the sensing element from contamination

Detailed Description

Denso 234-2002 is designed for upstream oxygen sensor service on vehicles such as the 1991-1994 Mitsubishi Eclipse, 1991-1995 Hyundai Scoupe, and 1989-1993 Mitsubishi Galant. It also covers additional select Hyundai, Mitsubishi, Dodge Colt, Plymouth Laser, and related applications listed in the fitment data. If you are replacing a worn sensor on a 1990 Mitsubishi Mirage or a 1990-1991 Hyundai Sonata, this OE-style part number 234-2002 provides the correct fit for the specified vehicle and position.

The sensor is manufactured and tested to OE standards for accurate replacement on the original application. Its specific-fit design helps reduce installation issues, while the contamination-resistant trap layer supports long-term sensor durability and reliable engine management feedback.

This part cross-references Bosch 12023 and NTK 24102 for the same application.

Common Problems This Part Can Address

• Check engine light related to upstream oxygen sensor faults
• Rough idle or inconsistent air-fuel mixture control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow sensor response from an aging or contaminated unit
• Failed emissions testing tied to a defective oxygen sensor

Installation Notes and Tips

• Verify the vehicle year, make, model, and upstream position before ordering.
• Confirm the connector style, wire count, and threaded mounting dimensions match the original sensor.
• Inspect the harness routing and connector condition before installation.
• Use the listed fitment only; this is a specific-fit sensor, not a universal part.
• For California applications, review the fitment notes shown for the exact vehicle listing.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The design reflects Denso’s focus on direct-fit service parts for select Hyundai and Mitsubishi applications, including the 1991-1994 Mitsubishi Eclipse and 1991-1995 Hyundai Scoupe.