Denso 234-4385 Oxygen Sensor - Upstream

Denso 234-4385 Oxygen Sensor for 2006 Lancer

The Denso 234-4385 is an OE-style heated oxygen sensor built for the 2006 Mitsubishi Lancer upstream position. It is engineered as a specific-fit replacement with a 4-wire female connector, threaded mounting, and a 15.55-inch wiring harness for direct replacement service.

Key Features

• OE Style replacement oxygen sensor from Denso
• Specific fit for the upstream location on the 2006 Mitsubishi Lancer
• Heated sensor design for faster operating response
• 4-wire configuration with female connector
• Threaded mounting with 0.708-inch thread diameter
• 15.55-inch wiring harness length for application-specific routing
• Built to OE standards for exact replacement fitment

OE-Style Design and Fit

Denso’s OE Style line is built around exact replacement requirements, with attention to connector style, harness length, and mounting dimensions. The 234-4385 oxygen sensor is designed for the 2006 Mitsubishi Lancer, upstream, and follows the original equipment layout for straightforward service. This part number, 234-4385, is also a direct reference point for shoppers comparing OE-style oxygen sensor replacements for the Mitsubishi Lancer.

The sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable sensor operation and long service life. This part cross-references Bosch (e.g., 15591) for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to upstream oxygen sensor faults
• Incorrect air-fuel mixture readings
• Reduced fuel economy caused by a worn sensor
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor performance

Installation Notes and Tips

Verify the upstream sensor location before installation and confirm connector style, wire count, and thread size match the original unit. The 2006 Mitsubishi Lancer oxygen sensor replacement should be installed on the threaded mounting point and routed to match the factory harness path. Use proper oxygen sensor service tools and inspect the connector and wiring for heat damage before final connection.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The 234-4385 is built as a direct replacement for the 2006 Mitsubishi Lancer upstream application, with OE-style construction intended to match original equipment specifications.