Denso 234-8058 Oxygen Sensor - Downstream

Denso 234-8058 Oxygen Sensor for Mazda 3

The Denso 234-8058 is a heated, specific-fit oxygen sensor built for OE-style replacement on select Mazda applications. It is engineered for the downstream position on 2017-2018 Mazda 3 and Mazda 3 Sport models built in Mexico, with a threaded mounting design and a 4-wire female connector for direct-fit service.

Key Features

• OE Style replacement oxygen sensor from Denso
• Specific fit for direct application matching
• Heated sensor design for downstream exhaust monitoring
• 4-wire configuration with female connector
• Threaded mounting type with 0.709 in. thread diameter
• 10.75 in. wiring harness length
• Cross-reference: Mazda PEDE1886Z

Product Details

Denso 234-8058 is manufactured and tested to OE standards for accurate replacement fit and consistent sensor performance. The sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable exhaust feedback and long service life. This OE Style oxygen sensor is a direct replacement choice for Mazda 3 oxygen sensor replacement and Mazda 3 Sport downstream oxygen sensor service on the listed Mexico-built vehicles.

Compatible With 2017-2018 Mazda 3, downstream, and 2017-2018 Mazda 3 Sport, downstream. The part number 234-8058 is also a useful reference when matching the correct OE-style sensor for these applications.

Common Issues This Part Can Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust gas feedback readings
• Reduced fuel economy caused by a failing sensor signal
• Rough engine operation tied to sensor degradation
• Contamination-related sensor response problems

Installation Notes and Tips

Verify the vehicle is a Mexico-built 2017-2018 Mazda 3 or Mazda 3 Sport with downstream sensor placement before ordering. Match the connector style, wire count, and threaded mounting dimensions to the original sensor, and inspect the exhaust bung threads before installation. The 10.75 in. harness length should be checked against the factory routing to confirm proper reach and strain relief.

Quality Assurance

Denso builds this OE Style oxygen sensor to strict original-equipment standards and tests each unit for replacement accuracy and fit consistency. The 234-8058 is designed as a direct-fit service part for the listed Mazda applications.