Denso 234-4973 Oxygen Sensor - Downstream or Downstream Right

Denso OE Style Oxygen Sensor 234-4973

Denso 234-4973 is an OE Style heated oxygen sensor built for direct replacement on select BMW applications. It is engineered for exact fitment and reliable signal feedback, with a threaded mounting design and a 4-wire male connector for straightforward replacement service.

Compatible with BMW M2, BMW M3, BMW M4, and BMW i8 downstream positions, this oxygen sensor supports accurate exhaust monitoring on the vehicles listed below. The Denso OE Style line focuses on first-time fit and OE-level construction for service work that demands the correct part number and the correct connector layout.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit design for direct replacement service
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 26.54 in. wiring harness length
• OE Style replacement built to match factory application requirements

Fitment Details

• Fits 2021 BMW M2, Downstream Right
• Fits 2019-2020 BMW i8, Downstream
• Fits 2014-2017 BMW i8, Downstream
• Fits 2019-2020 BMW M2, Downstream Right
• Fits 2015-2020 BMW M4, Downstream Right
• Fits 2015-2018 BMW M3, Downstream Right

Product Use

• Restores oxygen sensor feedback for downstream exhaust monitoring
• Addresses fault codes related to sensor response or circuit performance
• Helps correct drivability issues tied to inaccurate exhaust readings
• Supports emissions system service on BMW M2, M3, M4, and i8 models
• Replaces a worn or failed OE-style sensor with the correct connector and mounting style

Installation Notes

Verify the connector, wire count, mounting style, and downstream right or downstream location before installation. This part cross-references BMW 11787848487 and Bosch 16094 for the same application. Use the vehicle’s service information to confirm sensor placement and thread engagement before final tightening.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and consistent performance. The OE Style design includes an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination, supporting long service life and stable engine management feedback.