Denso 234-4972 Oxygen Sensor - Downstream Left

Denso OE Style Oxygen Sensor 234-4972

Denso 234-4972 is an OE Style heated oxygen sensor built for direct replacement on select BMW applications. It is engineered for exact fitment and stable signal performance, with a threaded mounting design and a specific-fit configuration for downstream left locations.

Key Features

• Heated oxygen sensor for precise exhaust monitoring
• Specific-fit design for direct replacement installation
• Threaded mounting type with 0.708 thread diameter
• 4-wire configuration with male connector
• Wiring harness length: 26.57
• OE Style construction for factory-style fit and function

OE Style Design and Construction

Denso’s OE Style line is built to match original equipment requirements for fit, form, and function. This sensor uses precision-built components for first-time fitment and includes Denso’s aluminum oxide trap layer, which helps protect the ceramic element from silicone and lead contamination. That protection supports consistent engine management performance and long service life in demanding exhaust environments. The Denso 234-4972 is a direct replacement choice for BMW M2, BMW M4, and BMW M3 downstream left applications.

This part cross-references BMW 11787848486 and Bosch 16142 for the same application.

Vehicle Fitment

• Fits 2021 BMW M2, Downstream Left
• Fits 2019-2020 BMW M2, Downstream Left
• Fits 2015-2020 BMW M4, Downstream Left
• Fits 2015-2018 BMW M3, Downstream Left

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn sensor
• Reduced fuel economy caused by slow sensor response
• Exhaust feedback issues on downstream left BMW applications
• Sensor contamination from age, heat, or exhaust exposure

Installation Notes

Verify the downstream left location, connector style, wire count, and thread size before installation. Match the original harness routing and connector orientation to avoid strain on the wiring. Because this is a specific-fit sensor, confirm the vehicle year, model, and position against the listed BMW M2, M4, and M3 applications before replacement.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and dependable operation. The OE Style design is intended to deliver the right part and the right fit for the listed BMW applications, including Denso 234-4972.