Bosch 15250 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Porsche 911

Bosch Actual OE Oxygen Sensor 15250 is a narrow-band heated replacement built for precise air-fuel-ratio feedback to the ECU. It is a direct-fit sensor for select Porsche 911 applications, including downstream service on 2000-2001 models, where accurate closed-loop control matters for emissions and drivability.

Key Features

• Specific-fit Bosch oxygen sensor for select Porsche 911 applications
• Narrow-band heated design for faster sensor activity and stable closed-loop operation
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 4-wire harness with oblong male connector and blade terminals
• Wiring harness included for direct replacement service
• Steel-finish metal housing built for high-temperature and vibration exposure

Product Details

Bosch part number 15250 is part of the Actual OE Oxygen Sensor line, which draws on Bosch’s long OE development history in oxygen sensing technology. This sensor uses a switching-type narrow-band design to report exhaust oxygen content to the engine control unit, helping maintain stable combustion control and emissions performance. For Porsche 911 owners searching for a downstream oxygen sensor replacement, Bosch 15250 provides the OE-style configuration expected for 2000-2001 Porsche 911 service.

The sensor’s heated construction supports quicker closed-loop operation after startup, while the ceramic sensing element and high-temperature materials are selected for durability under thermal cycling and vibration. Bosch 15250 is also referenced by interchange part number 99660611800 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle caused by inaccurate exhaust feedback
• Excess fuel consumption from poor air-fuel correction
• Slow closed-loop response after engine start
• Emissions test failures tied to sensor degradation

Installation Notes

Verify the downstream location before installation on 2000-2001 Porsche 911 models. Confirm connector shape, wire count, and thread size match the original sensor, and inspect the exhaust bung threads before tightening the new sensor. Use proper oxygen sensor service tools to avoid damaging the hex or harness during removal and installation.

Quality Assurance

Bosch supplies OE-developed oxygen sensor technology to the aftermarket, with designs based on decades of original equipment engineering. Bosch 15250 is built to OE-style specifications for accurate signal response and dependable operation in demanding exhaust conditions.