Bosch 13752 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor for BMW Z3

Bosch 13752 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit replacement for the downstream position on 1996-1998 BMW Z3 models, including BMW Z3 downstream applications that require OE-style sensor response and connector layout.

Key Features

• Specific-fit oxygen sensor for the downstream position on 1996-1998 BMW Z3
• Narrow-band heated 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; harness length measures 14 in
• Metal housing with high-temperature-resistant construction
• Bosch part number 13752 for direct catalog lookup

Product Details

Bosch’s Actual OE Oxygen Sensor line draws on decades of original-equipment development, including narrowband sensor designs that improve signal response and lambda accuracy during normal engine operation. This Bosch 13752 sensor uses a heated narrow-band design to help the engine control module maintain stable combustion control after warm-up, while the threaded steel-bodied construction is built for the thermal and vibration demands common in exhaust service. For BMW Z3 owners searching for a downstream oxygen sensor replacement, Bosch 13752 provides the OE-style fit and electrical configuration needed for proper sensor communication.

This part cross-references BMW 11781743996 for the same application.

Common Problems This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate oxygen sensor signal feedback
• Rough fuel control after the engine reaches operating temperature
• Emissions test failures tied to sensor response issues
• Connector or harness mismatch during oxygen sensor replacement

Installation Notes and Tips

Verify the downstream location before installation and confirm the connector style matches the vehicle harness. Use the 18 mm thread size and 22 mm hex specification to select the correct removal and installation tools. Inspect the exhaust bung threads and wiring routing before tightening the sensor, and make sure the harness is positioned away from heat sources and moving components. For BMW Z3 applications, confirm the part number Bosch 13752 against the original sensor before final installation.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development experience. The sensor is engineered with ceramic sensing elements, controlled heater operation, and heat-resistant materials to support consistent performance in demanding exhaust conditions.