NTK 21064 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Direct Fit Oxygen Sensor for OE-Style Replacement

NTK 21064 is a direct fit heated oxygen sensor built for specific downstream applications on select Chevrolet, Buick, GMC, Pontiac, and Saturn vehicles. It is engineered for the B1S2 and B2S2 positions where accurate exhaust feedback is needed for proper engine management and emissions control.

As part of NTK’s Direct Fit Oxygen Sensor line, this sensor is designed around OE application coverage and factory-style fitment. For vehicles such as the Chevrolet Malibu, Buick Regal, and Saturn Vue, NTK 21064 provides a threaded, 4-wire replacement with the correct harness length for the listed applications.

Key Features

• NTK part number 21064
• Direct Fit Oxygen Sensor for specific applications
• Heated oxygen sensor design
• 4-wire configuration with 15.0000 harness length
• 18.000 thread diameter and threaded mounting type
• Built for downstream B1S2 and B2S2 locations on listed vehicles
• OE-focused coverage for import and domestic applications

Product Details

NTK is known for oxygen sensor manufacturing and OE application support, and this Direct Fit Oxygen Sensor line is built to match the form, fit, and function expected in factory-style replacement work. NTK controls ceramic production from raw material through finished sensor, helping maintain consistency in the sensing element used in the finished part. The sensor is extensively tested during manufacturing to support quality and reliability aligned with OE specifications.

Fits 2008-2012 Chevrolet Malibu, downstream; 2011 Buick Regal, downstream; 2010 Buick Allure, downstream; 2010 Buick LaCrosse, downstream; 2008-2010 Chevrolet Captiva Sport, downstream right; and 2008-2010 Chevrolet Captiva Sport, downstream left. It also fits 2010 Chevrolet Equinox, downstream; 2010 GMC Terrain, downstream; 2008-2010 Pontiac G6, downstream; 2008-2010 Saturn Sky, downstream; and 2008-2010 Saturn Vue, downstream right or downstream left depending on the listed position.

This part cross-references DENSO Auto Parts 234-4250 for the same application.

Common Replacement Reasons

• Check engine light related to oxygen sensor performance
• Fault codes tied to downstream sensor response
• Incorrect air-fuel feedback affecting emissions monitoring
• Failed sensor heater circuit on a heated oxygen sensor
• Need for an OE-style replacement on listed Chevrolet Malibu, Buick Regal, or Saturn Vue applications

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for downstream, downstream right, and downstream left applications depending on vehicle and engine configuration. Match the connector style, wire count, thread diameter, and harness length to the original sensor before installation. Always verify the exact application by year, make, model, and position against the vehicle’s original equipment listing.

Quality Assurance

NTK manufactures oxygen sensors with OE application coverage and extensive production testing to support reliability and specification match. The brand’s background as an original equipment oxygen sensor supplier is reflected in the Direct Fit line, including NTK 21064.