Denso 234-3052 Oxygen Sensor - Upstream

OE-Style Oxygen Sensor for Toyota Supra

This Denso OE Style oxygen sensor is a specific-fit replacement for the upstream position on 1991-1992 Toyota Supra models. Built to match original equipment dimensions and signal requirements, Denso 234-3052 supports accurate exhaust feedback for consistent engine management.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific-fit design for direct replacement on the upstream location
• 3-wire configuration for OE-style electrical connection
• 19.84-inch wiring harness length for proper routing
• OE Style construction for a first-time fit on Toyota Supra applications
• Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination

Product Details

Denso 234-3052 is engineered to the same standards used for original equipment service parts, with precision-built components that match the factory fit and function expected on the 1991-1992 Toyota Supra. This upstream oxygen sensor helps the engine control system monitor exhaust oxygen content so fuel delivery and emissions control stay within the intended range. The Denso OE Style line focuses on exact replacement fitment, and this part number is built for the Toyota Supra, upstream application.

The Denso OE Style product line is aimed at direct-fit service replacement, making it a practical choice when you need the correct sensor shape, connector style, and harness length without modification. Part number 234-3052 is also referenced in the aftermarket under cross numbers such as Bosch 13910 and NTK 24137 for the same application.

What It Helps Address

• Check engine light caused by a failing upstream oxygen sensor
• Rough idle or inconsistent air-fuel feedback
• Reduced fuel economy from inaccurate exhaust readings
• Slow sensor response during closed-loop operation
• Emissions test failures related to oxygen sensor performance

Installation Notes and Tips

Install this sensor in the upstream location specified for 1991-1992 Toyota Supra applications. Confirm connector style, harness routing, and thread condition before installation. Because this is a specific-fit heated sensor, use the factory-style mounting location and verify the exhaust threads are clean to help ensure proper sealing and signal performance.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The sensing element protection layer is designed to help resist contamination that can shorten sensor life and affect engine performance. Denso 234-3052 is built as an OE-style replacement for dependable service on Toyota Supra applications.