NTK 21085 Oxygen Sensor - Downstream Left or Downstream Right

Direct Fit Oxygen Sensor for Corvette

NTK Direct Fit Oxygen Sensor 21085 is a specific-fit, heated oxygen sensor built for direct replacement service. It is engineered with a threaded mounting design and a 4-wire configuration for precise signal control and OE-style installation.

Fits 2017-2019 Chevrolet Corvette, downstream right and downstream left. This NTK oxygen sensor is part of the Direct Fit Oxygen Sensor line, which focuses on streamlined coverage and application-specific replacement parts.

Key Features

• Heated oxygen sensor for faster operating response.
• Specific-fit design for direct replacement service.
• Threaded mounting type for secure installation.
• 4-wire configuration for controlled sensor output.
• 18 mm thread diameter and 10.25 in. harness length.

Detailed Description

NTK part number 21085 is an emission control oxygen sensor for the Chevrolet Corvette. It is built as a direct fit replacement with a heated sensing element, threaded mounting, and application-specific wiring to match the original configuration. NTK uses ceramic technology and OE-focused manufacturing processes to produce oxygen sensors with fit, form, and function aligned to original equipment requirements. This part cross-references 12665161 for the same application.

What It Is Used For

• Replacing a failed oxygen sensor that triggers emissions-related fault codes.
• Restoring proper air-fuel feedback to the engine control system.
• Addressing drivability issues tied to inaccurate exhaust oxygen readings.
• Correcting sensor response problems caused by age, heat, or contamination.
• Supporting emissions system operation on the Corvette.

Installation Notes and Tips

Verify the downstream left or downstream right location before installation. Confirm connector routing, thread size, and harness length match the original sensor position. Use the vehicle’s service information for torque and wiring procedures, and inspect the exhaust bung threads before installing the sensor.

Quality Assurance

NTK states that its oxygen sensors are extensively tested during manufacturing and are built to meet or exceed OE specifications. Part number 21085 reflects NTK’s OE application focus and manufacturing control from raw material to finished sensor.