Denso 234-4046 Oxygen Sensor - Upstream, Upstream Rear or Upstream Right

Denso OE Style Oxygen Sensor 234-4046

Denso 234-4046 is an OE-style heated oxygen sensor built for specific-fit applications across Ford, Lincoln, Mercury, Mazda, and Jaguar vehicles. It is engineered for direct replacement service on upstream positions, with the correct connector, thread size, and harness length for a first-time fit.

Key Features

• Heated oxygen sensor with specific-fit design
• OE-style replacement for upstream sensor locations
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 10.63 in. wiring harness length
• Built to OE standards for accurate replacement fitment
• Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination

Product Details

Denso’s OE Style line is designed around exact replacement requirements, making this oxygen sensor a practical choice when servicing emissions and fuel-control systems. The heated sensor design supports faster operating temperature, while the specific-fit construction helps simplify replacement on applications such as Ford Mustang, Ford F-150, Ford Expedition, Lincoln Navigator, Mazda Tribute, and Mercury Mariner. Part number 234-4046 is also cross-referenced to Bosch 15716 for the same application.

By matching OE-style dimensions and connector layout, this sensor helps restore proper exhaust feedback to the engine control system. That matters on upstream sensor locations, where accurate air-fuel monitoring affects drivability, emissions performance, and fuel economy.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel control
• Reduced fuel economy from inaccurate exhaust readings
• Slow sensor response on heated upstream applications
• Failed emissions inspection caused by a worn sensor

Installation Notes and Tips

Confirm the vehicle year, make, model, and sensor position before ordering. This part is listed for upstream applications only, including upstream right and upstream rear positions on select vehicles. Match the connector style, wire count, and threaded mounting dimensions to the original sensor before installation. For best results, inspect the harness routing and exhaust threads during replacement.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for exact replacement fitment and consistent performance. The design includes an aluminum oxide trap layer to help protect the ceramic element from contamination, supporting long-term sensor durability in demanding exhaust environments.