Denso 234-3018 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-3018

The Denso 234-3018 is an OE Style heated oxygen sensor built for specific Volkswagen applications. It is engineered for exact replacement fitment on select Volkswagen Golf and Volkswagen Jetta upstream positions, with a threaded mounting design and a 3-wire male connector.

Key Features

• OE Style replacement oxygen sensor for specific fitment
• Heated sensor design for faster operating response
• 3-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 38.82 in.
• Built to OE standards for precise replacement fit
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Detailed Product Overview

Denso 234-3018 is designed for upstream oxygen sensor replacement on select Volkswagen Golf and Volkswagen Jetta models. As part of Denso’s OE Style line, this sensor is precision built for first-time fitment and consistent installation on the specified applications. The heated design helps the sensor reach operating temperature efficiently, while the OE-style construction supports accurate exhaust feedback for engine management systems.

This part cross-references Bosch 13936 and NTK 25574 for the same application. It is a direct-fit oxygen sensor for 1991-1992 Volkswagen Golf upstream, 1992 Volkswagen Jetta upstream, 1988-1990 Volkswagen Golf upstream, and 1987-1990 Volkswagen Jetta upstream applications listed below.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel mixture feedback to the engine control system
• Reduced fuel economy caused by a worn upstream sensor
• Slow sensor response during closed-loop operation
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes and Fitment

Compatible with 1991-1992 Volkswagen Golf, upstream; 1992 Volkswagen Jetta, upstream; 1991-1992 Volkswagen Jetta, upstream; 1988-1990 Volkswagen Golf, upstream; and 1987-1990 Volkswagen Jetta, upstream. Notes vary by application, including OE Style and, on one listing, sensor with 1 connector. Verify connector style, thread size, and upstream location before installation. The 38.82 in. harness length and threaded mounting design should be matched to the original sensor layout on the vehicle.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for dimensional accuracy and consistent performance. The OE Style product line is focused on exact replacement fitment, and the sensor’s protective trap layer is designed to help preserve the ceramic element under normal exhaust conditions.