NTK 21048 Oxygen Sensor

NTK Direct Fit Oxygen Sensor 21048

NTK Direct Fit Oxygen Sensor 21048 is a heated, specific-fit replacement built for downstream and upstream-left applications on select GM, Pontiac, Saturn, Saab, and Isuzu vehicles. It is engineered for direct replacement service on models such as the Chevrolet Impala, Buick LaCrosse, and Pontiac Grand Prix, with OE-style fitment and connector layout.

Key Features

• Heated oxygen sensor design for faster operating temperature
• Specific-fit replacement for direct installation on listed applications
• 4-wire configuration with a 13.0000 wiring harness length
• 18.000 thread diameter and threaded mounting type
• Built to meet or exceed OE specifications through manufacturing testing
• NTK direct fit line focuses on superior fit, form, and function

Product Details

NTK 21048 is part of the Direct Fit Oxygen Sensor line, a product family focused on OE-style replacement coverage for import and domestic vehicles. NTK, part of the NGK family of products, manufactures oxygen sensors with ceramic technology control from raw material through finished sensor. As an original equipment oxygen sensor supplier, NTK applies that manufacturing experience to replacement sensors for downstream control and air/fuel monitoring on vehicles including the Chevrolet Corvette, Buick Lucerne, and Pontiac G6.

This part cross-references Bosch 15280 and DENSO Auto Parts 234-4647 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect downstream exhaust feedback readings
• Reduced fuel control accuracy from a worn heated sensor
• Fault codes tied to sensor response or heater circuit issues
• Replacement needs for Bank 1 Sensor 1 or Bank 2 Sensor 2 locations on listed vehicles

Installation Notes

Verify the sensor position before installation, since this part is listed for downstream, downstream right, downstream left, and upstream left locations depending on vehicle application. Confirm thread diameter, wire count, and harness length against the original sensor before replacement. For fitment-specific service, use the vehicle listing for the exact year, make, model, and sensor position, such as Fits 2006-2008 Buick Lucerne, Downstream or Fits 2005-2007 Chevrolet Corvette, Downstream Right.

Compatible applications include 2004-2007 Chevrolet Impala downstream, 2004-2007 Pontiac Grand Prix downstream, and 2005-2007 Saturn Relay downstream. Additional coverage includes 2005-2007 Buick LaCrosse downstream and 2006-2007 Pontiac G6 downstream right.

Quality Assurance

NTK manufactures oxygen sensors with extensive testing during production to help ensure quality and reliability that meet or exceed OE specifications. The brand’s OE-supplier background and ceramic sensor expertise support consistent performance across the listed applications.