NTK 21504 Oxygen Sensor - Upstream
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NTK
 Direct Fit Oxygen Sensor

NTK 21504 Oxygen Sensor - Upstream

Brand NTK 21504
Position Upstream
Wiring Harness Length 12.5000
Sensor Type Non heated
Universal Or Specific Fit Specific
Wire Quantity 2
Thread Diameter 18.000
Mounting Type Threaded
Product line Direct Fit Oxygen Sensor
Fits Chevrolet and Pontiac · 12 vehicles

Direct-fit design. Specific application coverage for a factory-style oxygen sensor replacement.

Non-heated sensor. 2-wire construction with threaded mounting for the correct application.

OE-level testing. Manufacturing checks support quality and reliability to OE specifications.

Cross-references Delphi ES10953, DENSO Auto Parts 234-2013 and Spectra Premium OS5203 for the same application. See all 7.

$56.09Free shipping
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Direct-Fit Oxygen Sensor

The NTK 21504 is a direct-fit oxygen sensor built for specific applications that require a threaded, non-heated design. It uses a 2-wire layout and a 12.5-inch harness length for a factory-style replacement on select Chevrolet Camaro and Pontiac Firebird applications.

Key Features

  • Direct Fit Oxygen Sensor line for specific applications
  • Non-heated sensor design with 2-wire construction
  • Threaded mounting type with 18 mm thread diameter
  • 12.5-inch wiring harness length
  • OE-equivalent design for factory-style replacement

Detailed Description

NTK 21504 is part of the Direct Fit Oxygen Sensor product line, which focuses on application-specific coverage and streamlined replacement selection. As an oxygen sensor from NTK, a major OE supplier, this part is engineered for fit, form, and function that align with original equipment requirements. It is a threaded, non-heated sensor with a specific-fit design, making it a direct replacement for select upstream locations on the Chevrolet Camaro and Pontiac Firebird. This part cross-references Delphi ES10953 and DENSO Auto Parts 234-2013 for the same application.

What It Is Used For

  • Replacing a worn or slow-responding oxygen sensor
  • Addressing check engine light concerns related to air-fuel feedback
  • Restoring proper exhaust oxygen measurement for engine management
  • Correcting drivability issues tied to inaccurate sensor readings

Installation Notes and Tips

Verify the upstream location, manifold side, connector style, and thread size before installation. Confirm the vehicle uses a 2-lead, non-heated sensor with an 18 mm threaded mount and a 12.5-inch harness. Match the application exactly to the listed Chevrolet Camaro and Pontiac Firebird fitments for proper installation.

Quality Assurance

NTK tests these oxygen sensors during manufacturing to support quality and reliability that meet or exceed OE specifications.

Related reading

This part fits 12 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2000ChevroletCamaro3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
2000ChevroletCamaro3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
2000PontiacFirebird3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
2000PontiacFirebird3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1999ChevroletCamaro3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1999ChevroletCamaro3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1999PontiacFirebird3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1999PontiacFirebird3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1998ChevroletCamaro3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1998ChevroletCamaro3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1998PontiacFirebird3.8LV6UpstreamLocated in RH Manifold; B2S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
1998PontiacFirebird3.8LV6UpstreamLocated in LH Manifold; B1S1; 2 Lead Sensor; OE Equivalent Design; Direct Fit Oxygen Sensor
Directly replaces or cross-references 7 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Delphi — ES10953DENSO Auto Parts — 234-2013Spectra Premium — OS520319211436AFS87OS2438SG1601