NTK 27090 Air / Fuel Ratio Sensor - Upstream

Direct-Fit Air/Fuel Ratio Sensor

NTK 27090 is a specific-fit, heated air/fuel ratio sensor built for upstream applications that require accurate mixture feedback. It uses a 5-wire design and an 18.00 mm thread diameter for OE-style replacement on select Volvo models.

As part of NTK's Direct Fit 5-Wire A/F Sensor line, this sensor is engineered for straightforward replacement without universal adaptation. The 47.24-inch harness length and specific-fit design support clean routing and proper connection on the intended application.

Key Features

• Heated air/fuel ratio sensor for upstream use
• 5-wire configuration for the specified application
• Specific-fit design for direct replacement
• 18.00 mm thread diameter with 0.38 thread length
• 47.24-inch wiring harness length

Application Details

Fits 2002-2009 Volvo S60, upstream. Fits 2002-2007 Volvo V70, upstream. Fits 2003-2007 Volvo XC70, upstream. Fits 2004-2006 Volvo S80, upstream. Fits 2003-2006 Volvo XC90, upstream. Fits 2003-2004 Volvo C70, upstream. Fits 2002 Volvo S80, upstream.

This part cross-references DENSO Auto Parts (e.g., 234-5700, 234-5701) for the same application.

What It Is Used For

• Replacing a failed upstream air/fuel ratio sensor
• Restoring proper fuel mixture feedback to the engine control system
• Addressing sensor-related drivability and emissions faults
• Correcting diagnostic trouble codes tied to mixture monitoring

Installation Notes and Tips

Verify the upstream Bank 1 Sensor 1 location before ordering. Confirm connector style, harness routing, and thread size against the original sensor to ensure proper installation on the intended Volvo application.

Quality Assurance

NTK is a major original equipment oxygen sensor supplier, and this sensor is manufactured and tested to meet or exceed OE specifications for fit, form, and function.