NTK 21041 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Saturn Vue and Ion

NTK 21041 is a direct fit heated oxygen sensor built for specific downstream applications on select Saturn models. It is engineered for accurate OE-style fit, form, and function, with a 4-wire design and threaded mounting for a straightforward replacement.

Compatible with 2004-2005 Saturn Vue, downstream, and 2003-2004 Saturn Ion, downstream, this NTK oxygen sensor supports emissions system performance and proper engine management. The NTK Direct Fit Oxygen Sensor line is built for import and domestic coverage with application-specific design.

Key Features

• Direct fit, specific application oxygen sensor
• Heated sensor design for faster operating temperature
• 4-wire configuration
• 18 mm thread diameter
• 36.25 in. wiring harness length
• Threaded mounting type
• OE-style fit, form, and function

Product Details

NTK 21041 is part of the Direct Fit Oxygen Sensor line, which focuses on application-matched replacement sensors for import and domestic vehicles. NTK uses ceramic manufacturing expertise and controlled production processes to build oxygen sensors that meet or exceed OE specifications through extensive manufacturing testing. This part cross-references Bosch 15044 for the same application.

For buyers searching for a downstream oxygen sensor for 2004-2005 Saturn Vue or 2003-2004 Saturn Ion, NTK 21041 provides a direct replacement option with the correct connector style, wire count, and threaded installation format. It is a practical choice when replacing a worn sensor that affects emissions feedback and fuel control.

Common Issues This Part May Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect oxygen sensor voltage or response readings
• Emissions test failure caused by sensor degradation
• Rough fuel control from inaccurate exhaust feedback
• Replacement needs after sensor contamination or age-related wear

Installation Notes and Tips

Verify the downstream position before ordering and match the connector, wire count, and thread size to the original sensor. Use the vehicle’s existing harness routing and confirm the sensor seats properly in the threaded bung before final tightening. For Saturn Vue and Saturn Ion applications, confirm the B1S2 downstream location matches the original equipment layout.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this part is manufactured and tested to meet or exceed OE specifications for fit and reliability. The Direct Fit Oxygen Sensor line is supported by NTK’s application coverage and OE-focused engineering.