Denso 234-4281 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4281

Denso 234-4281 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is specified for the downstream position on 2004-2005 Mitsubishi Lancer models, making it a direct-match choice for drivers searching for a 2004-2005 Mitsubishi Lancer downstream oxygen sensor or a Denso 234-4281 replacement.

Key Features

• OE Style design for specific-fit replacement
• Heated oxygen sensor for faster operating response
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 19.29 in.
• Built to OE standards for accurate sensor performance
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

This Denso oxygen sensor is engineered to match the original equipment form and function for the Mitsubishi Lancer. The heated design helps the sensor reach operating temperature quickly, while the specific-fit construction supports proper connector and thread alignment during replacement. Denso 234-4281 is intended for downstream use on 2004-2005 Mitsubishi Lancer applications and is a practical option when replacing a worn or slow-responding sensor.

Denso’s OE Style line focuses on precision-built replacement parts that follow factory specifications closely. The sensor’s protective trap layer is designed to reduce contamination damage to the sensing element, helping maintain stable engine management feedback and consistent fuel-control operation over time.

This part cross-references ACDelco 213-3881 and Bosch 15588 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a degraded downstream sensor
• Reduced fuel economy caused by inaccurate exhaust monitoring
• Slow sensor response after contamination or age-related wear
• Failed emissions inspection tied to sensor fault codes

Installation Notes and Tips

Confirm the downstream location before ordering and match the connector, thread diameter, and wire count to the original sensor. For best results, inspect the exhaust threads and wiring route before installation, and verify that the harness length provides proper reach without strain. This part is a direct-fit replacement for 2004-2005 Mitsubishi Lancer downstream applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit and performance consistency. The OE Style design and contamination-resistant sensing element support dependable replacement quality for Mitsubishi Lancer applications.