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Bosch 15555 Oxygen Sensor - Downstream
| Brand | Bosch 15555 |
|---|---|
| Position | Downstream |
| Product line | Bosch Validated Oxygen Sensor |
| Fits | Mazda · 3 vehicles |
Standard replacement. A direct-fit oxygen sensor for straightforward service replacement.
Narrow-band heated. Provides fast warm-up and stable air-fuel ratio feedback.
OE-proven design. Backed by Bosch's long history of oxygen sensor development.
Cross-references L39618861A for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Validated Oxygen Sensor for Mazda 6
Bosch Validated Oxygen Sensor 15555 is a narrow-band heated O2 sensor built for precise air-fuel ratio feedback to the ECU. It is a direct-fit replacement for select 2006-2008 Mazda 6 downstream applications with California emissions equipment, helping maintain stable closed-loop operation and emissions control.
Key Features
- Specific-fit oxygen sensor for the downstream position
- Narrow-band heated design for faster sensor response
- 4-wire configuration with included wiring harness
- Threaded mounting with 18 mm thread size and 22 mm hex
- Female rectangle connector with pin terminals
- Metal housing built for high-temperature and vibration exposure
- Bosch Validated Oxygen Sensor line backed by Bosch OE development
Product Details
Bosch part number 15555 uses advanced ceramic sensing elements and optimized heater control to deliver consistent signal output under demanding exhaust conditions. This Bosch Validated Oxygen Sensor is engineered for accurate lambda feedback, quicker closed-loop operation, and dependable performance in the exhaust stream. It is a direct replacement for the downstream sensor on the 2006-2008 Mazda 6 with California Emission System equipment. This part cross-references Monroe Shocks & Struts (e.g., L39618861A) for the same application.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Incorrect air-fuel ratio readings sent to the ECU
- Slow sensor response during closed-loop operation
- Emissions test failures tied to downstream O2 sensor faults
- Rough combustion control caused by aging narrow-band sensors
Installation Notes
Fits 2006-2008 Mazda 6, downstream, located after the primary converter, with California Emission System. Verify connector shape, thread size, and harness length before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads for damage or contamination before threading in the replacement sensor.
Quality Assurance
Bosch has more than five decades of OE oxygen sensor development and supplies aftermarket sensors built to OE-proven standards. Bosch Validated Oxygen Sensor 15555 reflects that engineering background with materials and heater control chosen for durability in harsh thermal and vibration conditions.
| Year | Make | Model | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2008 | Mazda | 6 | Automatic | 2.3L | L4 | Downstream | Located After Primary Converter; with California Emission System; Bosch Validated Oxygen Sensor |
| 2007 | Mazda | 6 | Automatic | 2.3L | L4 | Downstream | Located After Primary Converter; with California Emission System; Bosch Validated Oxygen Sensor |
| 2006 | Mazda | 6 | Automatic | 2.3L | L4 | Downstream | Located After Primary Converter; with California Emission System; Bosch Validated Oxygen Sensor |
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