Bosch 13577 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Saab and Porsche

Bosch Actual OE Oxygen Sensor 13577 is a narrow-band heated downstream sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in vehicles that require an OE-style replacement, including select Saab 9-5, Saab 9-3, Saab 900, Saab 9000, and Porsche 911 applications.

Key Features

• Actual OE Oxygen Sensor line from Bosch
• Narrow-band heated oxygen sensor design
• Specific fit replacement with threaded mounting
• 4-wire configuration with oblong male connector
• Blade terminals and included wiring harness
• 18 mm thread size and 22 mm hex size
• Steel finish with metal housing for underbody use

Product Line Details

Bosch Actual OE Oxygen Sensor parts are based on Bosch’s long OE development history in oxygen sensing technology. This sensor uses a switching-type narrow-band design with a heated element and ceramic sensing construction to deliver fast closed-loop response and accurate lambda feedback under changing exhaust temperatures. Bosch 13577 is built for direct replacement service where the original sensor location and connector style must match the vehicle harness.

This part cross-references 4660163 and 4660502 for the same application.

Fitment

• Fits 2000 Saab 9-5, downstream; to chassis # Y3040000; Actual OE Oxygen Sensor
• Fits 1999 Saab 9-3, downstream; Actual OE Oxygen Sensor
• Fits 1999 Saab 9-5, downstream; Actual OE Oxygen Sensor
• Fits 1996-1998 Saab 900, downstream; Actual OE Oxygen Sensor
• Fits 1996-1997 Porsche 911, downstream; Actual OE Oxygen Sensor
• Fits 1996-1997 Saab 9000, downstream; with Grey Connector; Actual OE Oxygen Sensor

Common Replacement Uses

• Restores downstream oxygen sensor signal accuracy
• Addresses check engine light concerns related to O2 sensor performance
• Helps correct rich or lean fuel-control feedback issues
• Supports proper closed-loop operation after sensor aging or contamination
• Replaces a damaged connector, harness, or threaded sensor body

Installation Notes

Confirm the downstream location, connector shape, and harness routing before installation. This Bosch 13577 uses a threaded mount, 18 mm thread size, and a 4-wire heated configuration, so matching the original connector and sensor style is important for proper installation. Inspect the exhaust bung threads and wiring path for heat damage, corrosion, or contamination before installing the new sensor.

Quality Assurance

Bosch supplies this Actual OE Oxygen Sensor as an OE-proven replacement built to the same functional standards used in original vehicle development. The design emphasizes accurate signal output, fast warm-up, and durability under high exhaust heat and vibration.