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Bosch 13431 Oxygen Sensor - Downstream
| Brand | Bosch 13431 |
|---|---|
| Position | Downstream |
| Product line | Actual OE Oxygen Sensor |
| Fits | Mercedes-Benz · 2 vehicles |
Actual OE design. Built as a standard replacement oxygen sensor for straightforward service.
Narrow-band heated sensor. Provides precise air-fuel measurements and quicker closed-loop operation.
Durable construction. Uses advanced ceramic elements and high-temperature-resistant materials.
Cross-references 0005405017 for the same application. See all 1.
Bosch OE Oxygen Sensor for Mercedes-Benz S320
Bosch Actual OE Oxygen Sensor 13431 is a narrow-band heated replacement built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit sensor for the downstream position on 1994-1995 Mercedes-Benz S320 models, helping maintain stable combustion control and emissions performance.
Key Features
- Actual OE Oxygen Sensor from Bosch
- Specific-fit downstream application for 1994-1995 Mercedes-Benz S320
- Narrow-band heated sensor design for closed-loop fuel control
- 4-wire configuration with round male connector and blade terminals
- Threaded mounting with 18 mm thread diameter and 22 mm hex size
- Wiring harness included for direct replacement use
- Steel-finish metal housing for high-temperature service
Product Details
Bosch 13431 is part of the Bosch Actual OE Oxygen Sensor line, a product family developed from Bosch’s long history in oxygen-sensor engineering. This line focuses on OE-style fit, accurate lambda measurement, and reliable heater control for faster sensor response and consistent operation under heat and vibration. For Mercedes-Benz S320 owners, Bosch 13431 provides a direct replacement solution for the downstream sensor location on 1994-1995 vehicles. This part cross-references Mercedes-Benz 0005405017 for the same application.
What This Sensor Helps Address
- Check engine light caused by oxygen sensor signal faults
- Rich or lean fuel trim conditions from inaccurate exhaust feedback
- Slow closed-loop response after warm-up
- Emissions test failures related to sensor performance
- Rough idle or unstable combustion control tied to aging O2 sensor output
Installation Notes and Tips
Verify the downstream location, connector style, thread size, and harness length before installation. The sensor uses a threaded mount with an 18 mm thread diameter and a 22 mm hex, so proper oxygen-sensor tools are recommended. Confirm the vehicle application as 1994-1995 Mercedes-Benz S320, downstream, and compare the original connector and wire routing to ensure correct routing and secure fitment.
Quality Assurance
Bosch backs this oxygen sensor with OE development experience and materials selected for high-temperature durability, accurate signal output, and dependable heater performance in demanding exhaust conditions.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1995 | Mercedes-Benz | S320 | 3.2L | L6 | Downstream | Actual OE Oxygen Sensor |
| 1994 | Mercedes-Benz | S320 | 3.2L | L6 | Downstream | Actual OE Oxygen Sensor |
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