NTK 25695 Oxygen Sensor - Downstream Left
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NTK
 Direct Fit Oxygen Sensor

NTK 25695 Oxygen Sensor - Downstream Left

Brand NTK 25695
Position Downstream Left
Wiring Harness Length 38.5000
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 · 2 vehicles

Direct-fit design. Specific-fit replacement for streamlined installation and OE-style application matching.

Heated sensor. 4-wire construction with threaded mounting for accurate exhaust feedback.

OE-focused engineering. NTK uses ceramic manufacturing expertise and extensive testing for quality control.

Cross-references Bosch 16986, DENSO Auto Parts 234-4829 and 234-4836 for the same application. See all 5.

$103.07Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $103.07
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Direct-Fit Oxygen Sensor

NTK Oxygen Sensor 25695 is a specific-fit, heated sensor built for emission control service where accurate exhaust feedback matters. It is engineered with a threaded mounting design and a 4-wire configuration for a direct-fit replacement approach.

  • Heated oxygen sensor for responsive exhaust monitoring.
  • Specific-fit design for straightforward application matching.
  • Threaded mounting with 18 mm thread diameter.
  • 38.5 in. wiring harness length for proper routing.
  • NTK 25695 for emission control repair and replacement.

Product Details

As part of NTK’s Direct Fit Oxygen Sensor line, this unit is built around application-specific coverage and OE-style fit, form, and function. NTK is known for oxygen sensor manufacturing and uses ceramic-focused production technology to control the sensor from raw material through finished product. For 2008-2009 Audi TT Quattro downstream left service, this sensor is listed for B2S2 placement and is intended to match the original configuration closely. This part cross-references Bosch 16986 and DENSO Auto Parts 234-4829 for the same application.

What It Helps Address

  • Check engine light concerns related to oxygen sensor performance.
  • Incorrect exhaust oxygen readings affecting fuel control.
  • Emissions system faults tied to a worn or failed sensor.
  • Driveability issues caused by inaccurate air-fuel feedback.

Installation Notes

Use the threaded mounting style and harness length to confirm routing and sensor placement before installation. Verify the connector, wire count, and downstream left B2S2 application details against the original part number 25695 and the vehicle’s service information before replacement.

Quality Assurance

NTK tests these oxygen sensors during manufacturing to meet or exceed OE specifications. The brand’s OE-supplier background and ceramic manufacturing expertise support consistent fit and reliable operation for emission control service.

Related reading

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2009AudiTT Quattro3.2LV6Downstream LeftOxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor
2008AudiTT Quattro3.2LV6Downstream LeftOxygen Sensor B2S2 placement designed to OE specifications.; Direct Fit Oxygen Sensor
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 16986DENSO Auto Parts — 234-4829234-483616865022906262BT