NTK 21502 Oxygen Sensor - Upstream

Direct Fit Oxygen Sensor for Saturn

NTK 21502 is a direct fit oxygen sensor built for specific upstream applications on Saturn models. It uses a threaded, non-heated design with a 5.5-inch wiring harness for a precise replacement path.

Key Features

• Direct fit oxygen sensor for specific applications
• Non-heated sensor design
• Threaded mounting type with 14 mm thread diameter
• 5.5-inch wiring harness length
• Single-wire configuration

Detailed Description

NTK 21502 is engineered for upstream air-fuel ratio monitoring on Saturn SC, SC1, SC2, SL, SL1, SL2, SW1, and SW2 applications listed in the fitment data. This oxygen sensor follows OE-style fitment and function, making it a practical replacement for vehicles that require a specific threaded sensor with the same connector and harness layout. The part number 21502 is also referenced by cross-application numbers such as Bosch 13043 and Delphi ES10628 for the same application.

NTK is part of the NGK family and focuses on oxygen sensor coverage for import and domestic vehicles. As a major OE oxygen sensor supplier, NTK uses controlled ceramic technology and manufacturing testing to support fit, form, and function that align with OE specifications. For Saturn SC and Saturn SL service work, this sensor supports accurate upstream exhaust feedback in the original application range.

What It Is Used For

• Replacing a failed upstream oxygen sensor
• Restoring air-fuel ratio feedback to the engine control system
• Addressing sensor-related check engine light concerns
• Correcting drivability issues tied to inaccurate exhaust readings
• Servicing OE-style emissions control hardware on listed Saturn models

Installation Notes and Tips

Verify the vehicle’s year, model, and upstream sensor location before ordering. Confirm the 14 mm threaded mounting style, single-wire configuration, and harness length against the original part. Use the fitment notes for Bank 1 Sensor 1 and federal emissions references where applicable.

Quality Assurance

NTK tests oxygen sensors during manufacturing to meet or exceed OE specifications for quality and reliability. The brand’s OE supplier background and controlled ceramic manufacturing process support consistent performance in the specified application.