NTK 25622 Oxygen Sensor - Downstream, Downstream Right or Upstream

Direct Fit Oxygen Sensor for OE-Style Replacement

NTK 25622 is a direct fit heated oxygen sensor built for specific applications that require OE-style fit, form, and function. It serves as a replacement oxygen sensor for select Audi A8 Quattro, Volkswagen Jetta, and Volkswagen Passat applications, with coverage for downstream right, downstream, and upstream positions.

NTK’s Direct Fit Oxygen Sensor line focuses on application-specific replacement parts with the correct connector, harness length, thread size, and mounting style for the listed vehicles. Part number 25622 is a practical choice when you need a direct replacement for a failed sensor on a 1999-2005 Volkswagen Jetta, 2002-2004 Volkswagen Passat, or 2004-2006 Audi A8 Quattro.

Key Features

• Heated oxygen sensor for faster operating response
• Specific fit design for direct replacement on listed applications
• 4-wire configuration
• 35.75 in. wiring harness length
• 18 mm thread diameter with threaded mounting type
• OE-equivalent design for downstream and upstream positions shown in fitment

Product Details

NTK 25622 is part of the Direct Fit Oxygen Sensor line, which is built around application-specific coverage for import and domestic vehicles. NTK uses ceramic sensor technology and OE-focused manufacturing controls to deliver consistent sensor construction from raw material through finished product. This oxygen sensor is engineered for the listed Volkswagen Jetta, Volkswagen Passat, and Audi A8 Quattro applications, including downstream right and upstream locations where specified. This part cross-references Bosch 16034 and DENSO Auto Parts 234-4809 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings
• Slow sensor response from a worn heated O2 sensor
• Emissions test failures tied to sensor output
• Driveability issues caused by inaccurate exhaust oxygen feedback

Installation Notes and Tips

• Verify the exact position before ordering: downstream right, downstream, or upstream as listed.
• Match the connector style, wire count, and harness length to the original sensor.
• Inspect the exhaust threads and sensor bung before installation.
• Use the vehicle’s service information for torque and routing specifications.
• Clear diagnostic trouble codes after installation and confirm proper sensor operation.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to support quality and reliability that meets or exceeds OE specifications. The brand is recognized as a major original equipment oxygen sensor supplier, and the Direct Fit line is built to support accurate replacement on the listed applications.