NTK 25728 Oxygen Sensor - Downstream or Upstream
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NTK
 Direct Fit Oxygen Sensor

NTK 25728 Oxygen Sensor - Downstream or Upstream

Brand NTK 25728
Position Upstream and Downstream
Wiring Harness Length 36.5000
Sensor Type Heated
Universal Or Specific Fit Specific
Wire Quantity 4
Thread Diameter 18.000
Mounting Type Threaded
Product line Direct Fit Oxygen Sensor
Fits Audi and Volkswagen · 13 vehicles

Direct-fit design. Specific-fit oxygen sensor for streamlined replacement service.

Heated 4-wire sensor. Supports accurate exhaust feedback with a threaded mounting style.

OE-level testing. Extensively tested to meet or exceed original equipment specifications.

Cross-references BBB Industries 16978, Bosch 16982 and DENSO Auto Parts 234-4809 for the same application. See all 10.

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Direct-fit oxygen sensor

NTK Oxygen Sensor 25728 is a specific-fit, threaded heated oxygen sensor built for import applications that require OE-style fit, form, and function. It uses a 4-wire design with a 36.5-inch harness and an 18 mm thread diameter for direct replacement service.

Key features

  • Heated oxygen sensor with specific-fit application coverage
  • 4-wire configuration for accurate signal delivery
  • 36.5-inch wiring harness for proper routing
  • Threaded mounting type with 18 mm thread diameter
  • Direct Fit Oxygen Sensor line from NTK

Fitment details

Compatible with Audi TT Quattro and Volkswagen Golf, Jetta applications listed below. Fits 2000-2001 Audi TT Quattro, upstream; Fits 2000-2001 Audi TT Quattro, downstream; Fits 2002-2005 Volkswagen Golf, downstream; Fits 2002-2004 Volkswagen Jetta, downstream. Part number 25728 is also referenced in OE-style cross applications for the same sensor type.

What this sensor helps address

  • Fault codes related to oxygen sensor response or heater circuit performance
  • Incorrect air-fuel ratio readings from a worn sensor
  • Emissions test failures caused by degraded sensor output
  • Rough idle or drivability issues tied to inaccurate exhaust feedback
  • Replacement needs for a threaded heated oxygen sensor with specific fitment

Installation notes and quality

Use the vehicle-specific position and notes in the fitment table to confirm upstream or downstream placement before installation. The threaded design and harness length support direct replacement on the listed applications. NTK states these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications, and the brand is known for original equipment oxygen sensor production.

Related reading

This part fits 13 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2005VolkswagenGolf2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2004VolkswagenGolf2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2004VolkswagenJetta2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2003VolkswagenGolf2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2003VolkswagenJetta2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2002VolkswagenGolf2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2002VolkswagenJetta2.8LV6DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2001AudiTT Quattro1.8LL4UpstreamB1S1; ATC Eng; OE Equivalent Design; Direct Fit Oxygen Sensor
2001AudiTT Quattro1.8LL4DownstreamB1S2; ATC Eng; OE Equivalent Design; Direct Fit Oxygen Sensor
2001AudiTT Quattro1.8LL4DownstreamB1S2; To Chassis # 8N-1-034-000; OE Equivalent Design; Direct Fit Oxygen Sensor
2000AudiTT Quattro1.8LL4UpstreamOE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio.; Direct Fit Oxygen Sensor
2000AudiTT Quattro1.8LL4DownstreamDownstream oxygen sensor with original equipment equivalent design; Direct Fit Oxygen Sensor
2000AudiTT Quattro1.8LL4DownstreamB1S2; To Chassis # 8N-1-034-000; OE Equivalent Design; Direct Fit Oxygen Sensor
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 16978Bosch — 16982DENSO Auto Parts — 234-4809DENSO Auto Parts — 234-4874Spectra Premium — OS5027Spectra Premium — OS503006A906262BA06A906262P75-2738022906262S