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Bosch 13523 Oxygen Sensor - Upstream
| Brand | Bosch 13523 |
|---|---|
| Position | Upstream |
| Product line | Actual OE Oxygen Sensor |
| Fits | BMW · 6 vehicles |
Actual OE design. Bosch brings OE-proven oxygen sensor engineering to the aftermarket.
Narrow-band heated sensor. Provides precise air-fuel measurements and quicker closed-loop operation.
Threaded metal housing. Built with high-temperature-resistant materials for harsh conditions.
Cross-references 11781742023 for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch OE Oxygen Sensor for BMW Upstream Applications
Bosch 13523 is a specific-fit, narrow-band heated oxygen sensor built for upstream air-fuel monitoring on select BMW applications. It provides the ECU with precise exhaust oxygen feedback to support stable combustion control and lower emissions.
Key Features
- Actual OE Oxygen Sensor from Bosch Actual OE Oxygen Sensor line
- Narrow-band heated design for faster closed-loop operation
- Specific fit with threaded mounting and round female connector
- 4-wire configuration with included wiring harness
- 18 mm thread diameter and 22 mm hex size
- Steel finish with metal housing for high-temperature service
- Wiring harness length: 15.2 in; overall length: 18.9 in
Product Details
Bosch 13523 uses advanced ceramic sensing elements and heater control to deliver accurate lambda feedback under changing load and temperature conditions. Bosch developed its oxygen sensor technology from the original thimble design introduced in 1976 and later refined planar narrowband construction for quicker light-off and faster closed-loop response. This part cross-references 11781742023 for the same application. It is a direct-fit oxygen sensor for BMW 530i, BMW 540i, and BMW 840Ci upstream positions, including the 1994 BMW 530i from 06/1994 and the 1994-1995 BMW 540i and 840Ci applications.
What This Sensor Helps Address
- Check engine light related to oxygen sensor performance
- Rough idle caused by inaccurate air-fuel feedback
- Rich or lean running conditions from delayed sensor response
- Higher exhaust emissions from poor closed-loop control
- Slow warm-up behavior in heated sensor circuits
Installation Notes
Install Bosch 13523 in the threaded upstream location specified for the vehicle. Verify connector shape, terminal count, and harness routing before installation. Use the 18 mm thread size and 22 mm hex specification when selecting removal and installation tools. Confirm the BMW 530i, BMW 540i, or BMW 840Ci application by year and position before replacing the sensor.
Quality Assurance
Bosch backs this oxygen sensor with more than five decades of OE development and supplies aftermarket parts built to OE-proven standards. The design uses durable materials intended to withstand heat and vibration in demanding exhaust environments.
| Year | Make | Model | Transmission | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1995 | BMW | 530i | Automatic | 3.0L | V8 | Upstream | Actual OE Oxygen Sensor |
| 1995 | BMW | 540i | — | 4.0L | V8 | Upstream | Actual OE Oxygen Sensor |
| 1995 | BMW | 840Ci | — | 4.0L | V8 | Upstream | Actual OE Oxygen Sensor |
| 1994 | BMW | 530i | Automatic | 3.0L | V8 | Upstream | From 06/1994; Actual OE Oxygen Sensor |
| 1994 | BMW | 540i | — | 4.0L | V8 | Upstream | Actual OE Oxygen Sensor |
| 1994 | BMW | 840Ci | — | 4.0L | V8 | Upstream | Actual OE Oxygen Sensor |
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