Denso 234-4607 Oxygen Sensor - Upstream

Denso OE Style Oxygen Sensor 234-4607

Denso 234-4607 is a heated, specific-fit oxygen sensor built for direct replacement in select Ford and Mercury applications. It is engineered for the upstream position on 1995-1999 Ford Contour, 1999 Mercury Cougar, and 1995-1999 Mercury Mystique applications with OE-style fitment.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific-fit design for direct replacement
• 4-wire configuration with male connector
• Threaded mounting design with 0.708 in. thread diameter
• 15.35 in. wiring harness length
• OE Style line built for exact replacement fitment

OE Style Design Details

Denso’s OE Style line focuses on direct-fit replacement parts that match original equipment dimensions and connection points. For this application, the 234-4607 uses a threaded, heated sensor design with a 4-wire layout and male connector to support accurate installation on the upstream exhaust location. This part cross-references Bosch 13115 for the same application.

Vehicle Fitment

• Fits 1999 Ford Contour, upstream sensor with square connector; OE Style
• Fits 1995-1998 Ford Contour, upstream
• Fits 1999 Mercury Cougar, upstream sensor with square connector; OE Style
• Fits 1995-1999 Mercury Mystique, upstream sensor with square connector; OE Style

Common Issues This Part May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn upstream sensor
• Reduced fuel economy caused by slow or inaccurate sensor response
• Rough idle or drivability concerns tied to exhaust feedback data
• Failed emissions testing due to sensor degradation

Installation Notes

Confirm the upstream sensor location, connector style, and thread size before installation. Verify harness routing and connector reach against the original sensor, especially on 1999 Ford Contour, 1999 Mercury Cougar, and 1995-1999 Mercury Mystique applications. Use proper exhaust sensor service procedures to avoid damage to the sensing element or threads.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and performance. The sensor includes an aluminum oxide trap layer intended to protect the ceramic element from silicone and lead contamination, supporting long service life and stable engine management performance.