Denso 234-4576 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4576

Denso 234-4576 is an OE Style heated oxygen sensor built for direct replacement in specific Ford and Lincoln applications. It is engineered for exact fitment and consistent signal performance, with OE-level construction for downstream exhaust monitoring.

Key Features

• Heated oxygen sensor for downstream exhaust placement
• Specific fit design for direct replacement
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• Wiring harness length: 15.43 in.
• OE Style Denso replacement part number 234-4576

OE Style Construction

Denso’s OE Style line is built to match original equipment fit and function for the application. This sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management, fuel efficiency, and long service life. This part cross-references Ford BL3Z9G444B and Motorcraft DY1181 for the same application.

Vehicle Fitment

• Fits 2012-2020 Ford F-250 Super Duty, downstream
• Fits 2012-2020 Ford F-350 Super Duty, downstream
• Fits 2012-2014 Ford Expedition, downstream
• Fits 2012-2014 Lincoln Navigator, downstream

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect air-fuel feedback from a worn heated O2 sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Slow sensor response after contamination or age-related wear
• Driveability issues tied to faulty emissions monitoring

Installation Notes

Confirm the connector style, 4-wire layout, threaded mount, and downstream position before installation. Verify the harness length and thread diameter match the original sensor on your Ford F-250 Super Duty, Ford F-350 Super Duty, Ford Expedition, or Lincoln Navigator application. Use proper exhaust sensor service procedures to avoid damaging the sensing element or threads.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement use. The OE Style design is intended to deliver the correct fit and dependable emissions-system performance for the listed applications.