The NTK Switching Oxygen Sensor (part number 21539) is a direct-fit replacement for 1996-2003 Buick, Cadillac, Chevrolet, and GMC vehicles with 3.1L, 3.8L, and 4.6L engines.
Features:
- OEM QUALITY: NTK is the world's largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
- OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
- EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
- EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
- ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
Specifications:
| Sensor Type | Narrow-Band |
| Number of Wires | 4 |
| Number of Terminals | 4 |
| Connector Type | Pin |
| Connector Shape | Square |
| Connector Gender | Female |
| Terminal Gender | Female |
| Mounting Style | Threaded |
| Thread Size | M18 - 1.5 |
| Hex Size (mm) | 7/8" (22mm) |
| Heated | Yes |
| Fit Type | Direct Fit |
| Product Grade | Standard Replacement |
| Thread Type Standard | Metric |
Fits: 1996-2003 Buick, Cadillac, Chevrolet, GMC, and Oldsmobile models including Century, LeSabre, Park Avenue, Regal, Riviera, Skylark, DeVille, Eldorado and more - 3.1L, 3.8L, and 4.6L engines. Confirm your year, make, model, and engine before ordering.
WARNING: WARNING/Precaución: Cancer and Reproductive Harm - Cáncer y daño al sistema reproductivo - www.P65Warnings.ca.gov
