Denso 234-4247 Oxygen Sensor - Upstream

OE-Style Oxygen Sensor for Saturn Astra

This Denso OE Style oxygen sensor is a direct-fit replacement for the upstream position on select 2008-2009 Saturn Astra models. Built as a heated, threaded sensor with a female connector and 4-wire design, it is engineered for exact replacement and consistent signal performance.

Part number 234-4247 is made for buyers looking for a Saturn Astra upstream oxygen sensor that matches OE-style fitment and connector layout. It is also a practical choice when replacing a worn sensor on 2008 Saturn Astra or 2009 Saturn Astra applications.

Key Features

• Specific-fit oxygen sensor for the upstream location
• Heated sensor design for faster operating response
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• 18.54 in. wiring harness length
• OE Style replacement built for exact fitment

Product Details

Denso 234-4247 is an emission control oxygen sensor designed to replace the original upstream sensor on 2008-2009 Saturn Astra vehicles. The OE Style line focuses on direct replacement fit and factory-style connection points, which helps simplify selection for technicians and DIY repairs. Denso also uses an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination, supporting stable engine management and long service life.

This part cross-references Bosch 18027 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced fuel economy caused by a failing upstream sensor
• Slow sensor response during closed-loop operation
• Emission control faults tied to sensor contamination or wear

Installation Notes

Verify the upstream sensor location before ordering and match the connector, wire count, and threaded mounting style to the original part. For best results, inspect the harness routing and connector condition during installation, and confirm the sensor is tightened to the vehicle manufacturer’s specification.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit and performance. The OE Style product line is built for direct replacement applications, and the sensor design is intended to deliver the correct part and fit for the listed Saturn Astra models.