NTK 25586 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Direct-Fit Oxygen Sensor for BMW Applications

NTK Oxygen Sensor 25586 is a direct-fit, heated oxygen sensor built for specific BMW downstream applications. It is engineered for accurate fit, proper connector alignment, and OE-style performance in emissions monitoring.

• Direct-fit design for specific applications
• Heated oxygen sensor for faster operating response
• 4-wire configuration with threaded mounting
• 29.25-inch wiring harness length
• 18 mm thread diameter

OE-Style Fit and Function

NTK 25586 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and streamlined replacement selection. The sensor is built with NTK ceramic technology and manufactured to meet or exceed OE specifications through extensive testing. This part cross-references DENSO Auto Parts 234-4682 for the same application.

Used For Common Sensor Faults

• Replacing a failed downstream oxygen sensor
• Restoring proper emissions feedback signal output
• Addressing check engine light concerns related to oxygen sensor performance
• Correcting wiring or connector mismatch on a specific application
• Replacing a sensor with worn or degraded heating response

Installation Notes and Tips

Verify the downstream position and connector style before installation. This oxygen sensor uses a threaded mount and a specific-fit design, so matching the application details is important for proper installation on BMW X5, BMW 750iL, and BMW 318-series models. Confirm the harness length and wire count against the original sensor before replacement.

Quality Assurance

NTK is a major original equipment oxygen sensor supplier and tests these sensors during manufacturing to support OE-level quality and reliability. The 25586 is produced under NTK's sensor-focused engineering approach for consistent fit, form, and function.