NTK 25560 Oxygen Sensor - Upstream Left or Upstream Right

Direct Fit Oxygen Sensor

NTK 25560 is a direct-fit heated oxygen sensor built for specific applications and engineered for OE-style replacement. It uses a threaded mounting design with a 4-wire configuration and a 14.25-inch harness length for a precise service match.

Key Features

• Heated oxygen sensor for faster operating response.
• Specific-fit design for direct replacement applications.
• Threaded mounting type with 18 mm thread diameter.
• 14.25-inch wiring harness length and 4-wire configuration.
• NTK 25560 is backed by OE-focused sensor engineering.

Detailed Description

NTK 25560 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement parts with OE-style fit, form, and function. NTK draws on its role as a major original equipment oxygen sensor supplier and uses controlled ceramic technology from raw material through finished sensor production. This oxygen sensor is manufactured and tested to meet or exceed OE specifications, making it a practical choice for BMW 530i, BMW 740i, BMW 740iL, and BMW 840Ci applications listed in the fitment data. This part cross-references Bosch 13453 and Delphi ES10353 for the same application.

What It Is Used For

• Replacing a failed heated oxygen sensor.
• Restoring accurate air-fuel ratio feedback.
• Addressing sensor response or signal faults.
• Correcting OE-style threaded sensor fitment issues.
• Supporting emissions system diagnostics on BMW 530i and BMW 740i applications.

Installation Notes and Tips

Verify the upstream left or upstream right position, along with the model year and notes in the fitment table, before installation. Confirm the 4-wire layout, threaded mounting style, and harness length match the original sensor. Use the fitment notes for 1994-1995 BMW 530i, 740i, 740iL, and 840Ci applications to confirm the correct service location.

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.