NTK 25557 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for Volvo 850

NTK 25557 is a direct fit oxygen sensor built for specific applications and engineered for accurate exhaust feedback. It uses a heated, threaded design with a 4-wire harness and 20.7500 wiring harness length for a precise replacement on the correct application.

Key Features

• Heated oxygen sensor design for faster operating response.
• Specific fit construction for direct replacement use.
• Threaded mounting type with 18.000 thread diameter.
• 4-wire configuration for the intended sensor circuit.
• NTK Direct Fit Oxygen Sensor line focused on OE-style application coverage.

Detailed Description

NTK 25557 is part of the Direct Fit Oxygen Sensor line and is built for exact-application replacement. NTK, part of the NGK family, is a major original equipment oxygen sensor supplier and uses ceramic-based manufacturing control to maintain fit, form, and function across its sensor range. This oxygen sensor is extensively tested during manufacturing to meet or exceed OE specifications. Fits 1993 Volvo 850, upstream. This part cross-references Bosch 13120 for the same application.

What It Is Used For

• Replacing a worn or slow-responding oxygen sensor.
• Restoring proper exhaust feedback to the engine management system.
• Addressing sensor fault codes related to mixture control.
• Correcting drivability issues tied to inaccurate oxygen readings.

Installation Notes and Tips

Confirm the upstream position and chassis break noted in the fitment before ordering. Match the threaded mounting style, wire count, and harness length to the original sensor layout. Use the vehicle-specific application data for a proper direct fit on the Volvo 850.

Quality Assurance

NTK states that these oxygen sensors are extensively tested during manufacturing to help ensure quality and reliability that meet or exceed OE specifications.