Denso 234-4611 Oxygen Sensor - Downstream or Upstream

Denso 234-4611 Oxygen Sensor Overview

Denso 234-4611 is an OE-style heated oxygen sensor built for specific Ford and Mazda applications. It is engineered for direct replacement fitment on downstream and upstream positions where listed, including Ford Ranger oxygen sensor replacement and Mazda B2300 oxygen sensor service.

Built to OE standards, this Denso oxygen sensor is designed for accurate signal response, proper connector fit, and dependable operation in emissions control systems. The 234-4611 part number is a direct-fit option for drivers servicing older Ford and Mazda vehicles that require a threaded, 4-wire heated sensor.

Key Features

• OE Style replacement oxygen sensor for specific applications
• Heated sensor design for faster operating temperature
• Specific fit for direct installation on listed vehicles
• 4-wire configuration with male connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 23.62 in.
• Built with Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-4611 is part of Denso’s OE Style line, which focuses on exact replacement geometry and factory-style fitment. That matters when replacing an oxygen sensor on a Ford Escort, Ford Ranger, Mercury Tracer, or Mazda B2300, because correct sensor response and connector compatibility are critical for emissions performance and fuel control. This part cross-references Bosch 13131 for the same application.

As an emissions control sensor, this oxygen sensor monitors exhaust oxygen content so the engine control system can adjust air-fuel delivery. The heated design helps the sensor reach operating temperature more quickly, while the specific-fit construction supports a cleaner installation on the listed upstream and downstream positions.

Common Issues This Part Can Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel control
• Reduced fuel economy caused by inaccurate exhaust readings
• Failed emissions inspection tied to sensor faults
• Slow sensor response on aging Ford and Mazda applications

Installation Notes and Tips

Verify the sensor position, connector style, and thread size before installation. This part is a specific-fit, threaded oxygen sensor with a male connector and 4-wire layout, so matching the vehicle application is important for proper installation. Confirm whether your vehicle uses an upstream or downstream location, since the fitment list includes both positions across different models and years.

Fits 2003-1996 Ford Escort, downstream; fits 1999-1996 Mercury Tracer, downstream; fits 1997-1995 Ford Ranger, downstream; fits 1997-1995 Mazda B2300, downstream; fits 1995 and 1993 Ford Aerostar, upstream; fits 1992-1991 Ford E-350 Econoline, upstream; fits 1992-1991 Ford E-350 Econoline Club Wagon, upstream; fits 1992-1991 Ford F-250, upstream; fits 1992-1991 Ford F-350, upstream; fits 1992-1990 Ford Ranger, upstream; fits 1991 Ford E-250 Econoline Club Wagon, upstream; fits 1991 Ford Explorer, upstream; fits 1991 Ford Ranger, upstream; fits 1990 Ford Bronco, upstream; fits 1990 Ford E-150 Econoline, upstream; fits 1990 Ford E-150 Econoline Club Wagon, upstream; fits 1990 Ford E-250 Econoline, upstream; fits 1990 Ford E-250 Econoline Club Wagon, upstream; fits 1990 Ford E-350 Econoline, upstream; fits 1990 Ford E-350 Econoline Club Wagon, upstream; fits 1990 Ford F-150, upstream; fits 1990 Ford F-250, upstream; fits 1990 Ford F-350, upstream.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent replacement quality and first-time fit. The OE-style design and contamination-resistant trap layer support long-term sensor durability in demanding exhaust environments.