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NTK 21503 Oxygen Sensor - Upstream
| Brand | NTK 21503 |
|---|---|
| Position | Upstream |
| Wiring Harness Length | 5.5000 |
| Sensor Type | Non heated |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 1 |
| Thread Diameter | 14.000 |
| Mounting Type | Threaded |
| Product line | Direct Fit Oxygen Sensor |
| Fits | Saturn · 3 vehicles |
Direct-fit design. Application-specific replacement for straightforward installation and OE-style fit.
Non-heated sensor. Built with a single-wire layout and threaded mounting for the listed application.
OE-tested quality. Manufactured and tested to meet or exceed original equipment specifications.
Cross-references Delphi ES10950, OSC 13050 and 75-1838 for the same application. See all 9.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Direct-Fit Oxygen Sensor
NTK Oxygen Sensor 21503 is a specific-fit, threaded oxygen sensor built for direct replacement applications. It uses a non-heated design with a 5.5-inch wiring harness and a 14 mm thread diameter for a precise OE-style installation.
Compatible with 1994 Saturn SC2, upstream; 1994 Saturn SL2, upstream; and 1994 Saturn SW2, upstream. This NTK oxygen sensor is engineered for California emissions applications and OE equivalent design requirements.
Key Features
- Specific-fit oxygen sensor for direct replacement use
- Non-heated sensor design
- Threaded mounting type with 14 mm thread diameter
- 5.5-inch wiring harness length
- OE equivalent design for the listed Saturn applications
Detailed Description
NTK 21503 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style fit, form, and function. As an oxygen sensor from NTK, The Sensor Specialist, it reflects the brand’s background in ceramic technology and original equipment sensor manufacturing. For 1994 Saturn SC2, SL2, and SW2 upstream applications, this sensor is built to match the required configuration without universal adaptation.
This part cross-references Delphi ES10950 and OSC 13050 for the same application.
What It Is Used For
- Replacing a worn or inaccurate upstream oxygen sensor
- Addressing emissions-related fault codes tied to sensor performance
- Restoring proper air-fuel feedback to the engine control system
- Supporting California emissions-equipped Saturn applications
Installation Notes and Tips
Verify the upstream location, threaded mounting style, and harness length before installation. Confirm the vehicle’s emissions configuration and connector routing against the original sensor. Use the part number 21503 to match the correct application before ordering.
Quality Assurance
NTK tests oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. Part number 21503 is built as a direct-fit replacement for the listed applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1994 | Saturn | SC2 | 1.9L | L4 | Upstream | B1S1; Calif. Emissions; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1994 | Saturn | SL2 | 1.9L | L4 | Upstream | B1S1; Calif. Emissions; OE Equivalent Design; Direct Fit Oxygen Sensor |
| 1994 | Saturn | SW2 | 1.9L | L4 | Upstream | B1S1; Calif. Emissions; OE Equivalent Design; Direct Fit Oxygen Sensor |
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