NTK 24338 Air / Fuel Ratio Sensor - Upstream
OE Quality 60-Day Returns
NTK
 Direct Fit 5-Wire A/F Sensor

NTK 24338 Air / Fuel Ratio Sensor - Upstream

Brand NTK 24338
Position Upstream
Wiring Harness Length 67.0
Sensor Type Heated
Thread Length 0.38
Universal Or Specific Fit Specific
Wire Quantity 5
Thread Diameter 18.000
Mounting Bracket Included No
Product line Direct Fit 5-Wire A/F Sensor
Fits Audi · 26 vehicles

Direct-fit design. Specific application replacement for OE-style service without universal adaptation.

Heated 5-wire sensor. Built for responsive exhaust feedback and stable signal performance.

OE-focused engineering. NTK uses OE application technology and manufacturing testing for reliability.

Cross-references Bosch 17363, Carlson 17348 and Carlson 17349 for the same application. See all 13.

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Direct-fit upstream sensor

The NTK 24338 is a specific-fit air/fuel ratio sensor for import applications that require a heated 5-wire design. It is built for upstream placement and matches OE-equivalent form and function for service replacement on select Audi models.

  • Specific-fit replacement for direct application matching
  • Heated 5-wire sensor design for precise exhaust feedback
  • 18.0 mm thread diameter with 0.38 in thread length
  • 67.0 in wiring harness length for proper routing
  • OE-equivalent design for service-grade fitment

Fitment and application

Fits 2014-2015 Audi R8, upstream. Fits 2008-2012 Audi R8, upstream. Fits 2007-2010 Audi A8 Quattro, upstream. Fits 2007-2008 Audi RS4, upstream. Fits 2007 Audi A8 Quattro, upstream with chassis break notes for specific cylinder banks. Fits 2007 Audi S8, upstream with cylinder-bank-specific notes.

Use this NTK air/fuel ratio sensor when replacing a failed upstream sensor on Audi R8, Audi A8 Quattro, or Audi RS4 applications. The NTK 24338 is referenced for select OE-equivalent service needs and is identified by part number 24338 in catalog listings.

What it is used for

  • Restoring accurate air-fuel feedback to the engine control system
  • Addressing sensor fault codes related to upstream mixture monitoring
  • Replacing a worn or contaminated heated A/F sensor
  • Correcting drivability issues tied to improper exhaust signal input

Installation notes and quality

Confirm the upstream location, cylinder-bank notes, and chassis break information before installation. Verify connector routing and thread engagement against the original sensor to ensure proper service fit. Mounting bracket included: no.

NTK is part of the NGK family and is known for OE-focused sensor coverage. The 24338 is manufactured and tested to meet or exceed OE specifications for fit, form, and function. Part number 24338 is also cross-referenced to Bosch 17363 and DENSO Auto Parts 234-5114 for the same application.

Related reading

This part fits 26 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2015AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2014AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2012AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2011AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010AudiA8 Quattro4.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010AudiA8 Quattro4.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2010AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009AudiA8 Quattro4.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009AudiA8 Quattro4.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2009AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008AudiA8 Quattro4.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008AudiA8 Quattro4.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008AudiR84.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008AudiRS44.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2008AudiRS44.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro6.0LW12UpstreamCyls. 7-9; B3S1; From Chassis # 4E-7-017 625; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro6.0LW12UpstreamCyls. 10-12; B4S1; From Chassis # 4E-7-017 625; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro6.0LW12UpstreamCyls. 1-3; B1S1; From Chassis # 4E-7-017 625; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro6.0LW12UpstreamCyls. 4-6; B2S1; From Chassis # 4E-7-017 625; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro4.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiA8 Quattro4.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiRS44.2LV8UpstreamCyls. 1-4; B1S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiRS44.2LV8UpstreamCyls. 5-8; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiS85.2LV10UpstreamCyls. 9, 10; B4S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiS85.2LV10UpstreamCyls. 6-8; B3S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
2007AudiS85.2LV10UpstreamCyls. 4, 5; B2S1; OE Equivalent Design; Direct Fit 5-Wire A/F Sensor
Directly replaces or cross-references 13 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 17363Carlson — 17348Carlson — 17349DENSO Auto Parts — 234-51141K0998262AA07C906262CD07C906262CE75-383175-384075-384175-4073234-5101234-5103