Denso 234-4706 Oxygen Sensor - Downstream

Denso 234-4706 Oxygen Sensor for Subaru

Denso 234-4706 is an OE Style heated oxygen sensor built for specific-fit replacement on select Subaru applications. It is engineered for the downstream position on 1999-2004 Subaru Forester and 1999-2004 Subaru Impreza, with a direct-fit design that supports accurate exhaust monitoring and consistent engine management.

Denso’s OE Style line focuses on exact replacement fitment and factory-style performance. This oxygen sensor uses a threaded mounting design, a female connector, 4 wires, and a 17.72-inch wiring harness length for a clean installation on the intended Subaru Forester and Subaru Impreza applications.

Key Features

• OE Style replacement oxygen sensor for specific-fit applications
• Heated sensor design for downstream exhaust monitoring
• Threaded mounting type with 0.708-inch thread diameter
• 4-wire configuration with female connector
• 17.72-inch wiring harness length
• Built to Denso OE standards for replacement accuracy
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Detailed Description

The Denso 234-4706 oxygen sensor is designed for drivers and technicians who need a direct replacement for downstream Subaru emissions control service. It is a specific-fit part for 1999-2004 Subaru Forester and 1999-2004 Subaru Impreza, including 1999 Subaru Impreza Canada & Exc. Calif. OE Style applications. If you are searching for a downstream oxygen sensor for Subaru Forester or a replacement oxygen sensor for Subaru Impreza, this part number provides the correct OE-style configuration.

This part cross-references Bosch 13469 and NTK 24578 for the same application. The Denso 234-4706 is also listed against Subaru OE numbers 22690AA540 and 22690AA640.

Common Issues This Part Can Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings reported by the engine control system
• Reduced fuel economy caused by a worn or slow-responding sensor
• Emissions test failures tied to sensor performance
• Rougher engine operation from inaccurate air-fuel feedback

Installation Notes and Tips

Verify connector style, wire count, and threaded mounting before installation. This sensor is a specific-fit, heated downstream unit, so confirm the vehicle is a 1999-2004 Subaru Forester or 1999-2004 Subaru Impreza with the matching downstream application. Use proper exhaust sensor removal tools and inspect the harness routing to avoid strain on the 17.72-inch lead.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards for fit and function. The design includes an aluminum oxide trap layer intended to protect the sensing element from silicone and lead contamination, supporting long-term sensor durability and stable engine performance.