OE Quality
60-Day Returns

Spectra OS5201 Oxygen Sensor - Downstream, Downstream Left or Downstream Right
Reliable Oxygen Sensor for Buick, Chevrolet, GMC, and Isuzu Vehicles
The Spectra OS5201 oxygen sensor is designed to provide accurate emissions monitoring for select Buick, Chevrolet, GMC, and Isuzu models. This sensor helps maintain optimal engine performance and emissions control by delivering precise oxygen level readings to the vehicle's engine control unit.
- Compatible with Buick Lucerne and Chevrolet SSR
- Fits GMC Envoy XL, Envoy XUV, Rainier, and Trailblazer EXT
- Also compatible with Isuzu Ascender
- Part number OS5201 ensures exact replacement fit
- Designed for emission control sensor applications
Product Details and Compatibility
The Spectra OS5201 oxygen sensor is engineered to meet the specifications required for emission control systems in various GM and Isuzu vehicles. It is compatible with models such as the Buick Lucerne, Chevrolet SSR, GMC Envoy XL, Envoy XUV, Rainier, Trailblazer EXT, and the Isuzu Ascender. This sensor plays a critical role in monitoring the oxygen content in the exhaust gases, allowing the engine control module to adjust fuel injection and maintain efficient combustion.
Common Applications and Issues Addressed
- Helps reduce vehicle emissions by providing accurate oxygen level data
- Prevents engine performance issues related to incorrect air-fuel mixture
- Addresses check engine light triggers related to oxygen sensor faults
- Improves fuel economy by enabling precise fuel management
- Supports smooth engine idling and acceleration
Installation Notes and Tips
When installing the Spectra OS5201 oxygen sensor, ensure the vehicle is cooled down to avoid burns. Use an oxygen sensor socket for removal and installation to prevent damage. Verify the sensor connector matches the vehicle harness before installation. It is recommended to check for any exhaust leaks and clean the sensor mounting area prior to installation for optimal performance.
Quality Assurance and Warranty
Manufactured by Spectra, the OS5201 oxygen sensor adheres to industry standards for emission control components. While specific warranty details are not provided, Spectra products typically undergo rigorous testing to ensure durability and reliable operation within the specified vehicle applications.
This part fits 21 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2008 | Buick | Lucerne | 3.8L | V6 | Downstream | Compatible with Bank 1 Sensor 2 Oxygen Sensor. |
| 2004 | Buick | Rainier | 5.3L | V8 | Downstream Right | |
| 2004 | Buick | Rainier | 5.3L | V8 | Downstream Left | |
| 2004 | Chevrolet | SSR | 5.3L | V8 | Downstream Right | |
| 2004 | Chevrolet | SSR | 5.3L | V8 | Downstream Left | |
| 2004 | Chevrolet | Trailblazer EXT | 5.3L | V8 | Downstream Right | |
| 2004 | Chevrolet | Trailblazer EXT | 5.3L | V8 | Downstream Left | |
| 2004 | GMC | Envoy XL | 5.3L | V8 | Downstream Right | |
| 2004 | GMC | Envoy XL | 5.3L | V8 | Downstream Left | |
| 2004 | GMC | Envoy XUV | 5.3L | V8 | Downstream Right | |
| 2004 | GMC | Envoy XUV | 5.3L | V8 | Downstream Left | |
| 2004 | Isuzu | Ascender | 5.3L | V8 | Downstream Right | |
| 2004 | Isuzu | Ascender | 5.3L | V8 | Downstream Left | |
| 2003 | Chevrolet | SSR | 5.3L | V8 | Downstream Right | |
| 2003 | Chevrolet | SSR | 5.3L | V8 | Downstream Left | |
| 2003 | Chevrolet | Trailblazer EXT | 5.3L | V8 | Downstream Right | |
| 2003 | Chevrolet | Trailblazer EXT | 5.3L | V8 | Downstream Left | |
| 2003 | GMC | Envoy XL | 5.3L | V8 | Downstream Right | |
| 2003 | GMC | Envoy XL | 5.3L | V8 | Downstream Left | |
| 2003 | Isuzu | Ascender | 5.3L | V8 | Downstream Right | |
| 2003 | Isuzu | Ascender | 5.3L | V8 | Downstream Left |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.