Denso 234-4027 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4027

Denso 234-4027 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for downstream use on select Mitsubishi Eclipse and Dodge Colt applications, with the correct connector, thread size, and harness length for direct installation.

The Denso OE Style line focuses on factory-style fit and sensor performance. This oxygen sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable exhaust feedback, fuel control, and long service life.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit design for direct replacement
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• 21.81 in. wiring harness length
• OE Style construction for factory-like fit and function
• Part number 234-4027 for easy lookup and ordering

Detailed Description

This Denso oxygen sensor is designed for 1995-1999 Mitsubishi Eclipse, downstream, and 1993 Dodge Colt, downstream. It is a direct-fit replacement for vehicles that require a heated, threaded oxygen sensor with the listed connector and harness configuration. For shoppers searching for a downstream oxygen sensor for Mitsubishi Eclipse or a 1993 Dodge Colt oxygen sensor, 234-4027 provides the correct OE-style match.

Denso builds this sensor to strict OE standards and tests it for fit and performance. The sensor’s protective trap layer helps reduce contamination damage to the sensing element, which supports consistent exhaust readings and dependable engine management. This makes Denso 234-4027 a practical choice when replacing a worn downstream sensor on Mitsubishi Eclipse or Dodge Colt applications.

This part cross-references Bosch 13428 and NTK 23559 for the same application.

What This Sensor Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect exhaust feedback to the engine control system
• Reduced fuel economy from inaccurate air-fuel monitoring
• Rough or inconsistent engine operation related to sensor degradation
• Contamination-related sensor wear from silicone or lead exposure

Installation Notes and Tips

Verify the connector style, wire count, thread diameter, and downstream location before installation. Confirm the vehicle application by year, make, model, and position: Fits 1995-1999 Mitsubishi Eclipse, downstream; Fits 1993 Dodge Colt, downstream. Use proper exhaust sensor removal practices on a cool exhaust system and inspect the harness routing before final connection.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each unit for replacement fit and performance. The design is focused on accurate sensor response, direct-fit installation, and long-term durability in the exhaust stream.