Denso 234-8057 Oxygen Sensor - Downstream Right

Denso 234-8057 Oxygen Sensor for Mazda 6

The Denso 234-8057 is an OE-style narrow-band oxygen sensor built for direct replacement in the downstream right position. It is engineered for 2006-2008 Mazda 6 applications and uses a specific-fit design with a 4-wire harness for a precise match.

Denso’s Oxygen Sensor - OE Style line focuses on exact replacement fitment and OE-level testing. This sensor is built to match the original application closely, helping maintain accurate exhaust feedback on the Mazda 6 while supporting consistent engine management.

Key Features

• OE-style oxygen sensor for direct replacement fitment
• Specific fit for 2006-2008 Mazda 6, downstream right
• Narrow-band sensor type for factory-style exhaust monitoring
• 4-wire design with 22.05 in. wiring harness length
• Denso 234-8057 part number for easy identification
• Cross-references Carlson 15252 and Gates 24445 for the same application

Detailed Description

Denso 234-8057 is a downstream right oxygen sensor for the 2006-2008 Mazda 6. As part of Denso’s OE Style line, it is precision built for exact replacement and first-time fitment. The sensor uses a narrow-band design and a 4-wire configuration to match the original vehicle setup. Denso also incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable sensor operation over time.

For buyers searching for a 2006 Mazda 6 downstream right oxygen sensor, 2007 Mazda 6 oxygen sensor replacement, or 2008 Mazda 6 OE-style O2 sensor, the Denso 234-8057 provides a direct-fit solution for the listed application.

Common Issues This Part Can Address

• Faulty oxygen sensor signal causing check engine light concerns
• Incorrect exhaust feedback affecting fuel control
• Reduced fuel economy from a worn downstream sensor
• Emissions test failures related to sensor performance
• Rougher engine operation caused by inaccurate air-fuel monitoring

Installation Notes and Tips

Verify the downstream right location before ordering, since this part is specific to the listed Mazda 6 fitment. Compare the connector, wire count, and harness length to the original sensor to confirm a proper match. For best results, inspect the exhaust threads and surrounding wiring before installation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The OE-style design and contamination-resistant trap layer reflect Denso’s focus on accurate replacement parts for factory applications.