Bosch 15388 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch Part Number 15388 is an actual OE wideband air-fuel oxygen sensor built for precise mixture feedback and stable engine management. It is a specific-fit, heated upstream sensor with a 5-wire harness and 6-terminal blade connection for direct replacement service on select Chevrolet, Saturn, and Pontiac applications.

The Bosch Actual OE Oxygen Sensor line focuses on OE-style accuracy and durable construction. This wideband design measures air-fuel ratio across the full lambda range, giving the ECU detailed input for fuel control, drivability, and emissions management. Bosch Part Number 15388 is built for vehicles that require a wideband upstream sensor with threaded mounting and integrated wiring harness.

Key Features

• Wideband oxygen sensor for continuous air-fuel ratio measurement
• Heated design for faster sensor activity after startup
• Specific-fit replacement with threaded mounting
• 5-wire harness with oblong male connector and blade terminals
• 18 mm thread diameter and 22 mm hex size
• Steel finish with metal housing for OE-style durability
• Overall length: 15.9 in; sealing surface to connector end: 14.7 in

Detailed Description

Bosch 15388 uses wideband sensor technology to provide the engine control module with more detailed feedback than a traditional switching oxygen sensor. That level of signal detail supports accurate fuel trim control during idle, cruise, acceleration, and load changes. For drivers searching for a 2008-2010 Chevrolet Cobalt upstream oxygen sensor, a 2008-2010 Chevrolet HHR upstream oxygen sensor, or a 2007-2010 Saturn Sky upstream oxygen sensor, this Bosch replacement matches the confirmed application data.

This part cross-references GM 12589380 for the same application. It is also a direct-fit option for 2007-2009 Pontiac Solstice upstream service. Bosch’s OE development background and planar pump-cell wideband design are reflected in the sensor’s fast response, controlled heater operation, and robust ceramic construction.

Common Issues This Sensor Can Help Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle or hesitation caused by poor mixture feedback
• Reduced fuel economy from inaccurate exhaust oxygen measurement
• Emissions test failure tied to sensor response or signal faults

Installation Notes and Tips

• Confirm the upstream location before installation; this part is listed for upstream use only.
• Match the connector shape, terminal count, and wire count to the original sensor.
• Inspect the exhaust bung threads and sensor sealing surface before threading in the new unit.
• Route the harness away from hot exhaust components and moving parts.
• Clear diagnostic trouble codes after installation and verify live data response.

Quality Assurance

Bosch supplies OE-developed oxygen sensors to the aftermarket with the same engineering focus used in original equipment applications. Bosch Part Number 15388 is built as a standard replacement sensor for confirmed fitment on select Chevrolet Cobalt, Chevrolet HHR, Saturn Sky, and Pontiac Solstice models.