Bosch 16488 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor for Volvo

Bosch 16488 is a narrow-band heated oxygen sensor built for downstream monitoring on select Volvo applications. It delivers precise air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions in normal driving conditions.

Compatible With 2003-2004 Volvo S60, downstream; 2004 Volvo S80, downstream; 2003-2004 Volvo V70, downstream; 2003-2004 Volvo XC70, downstream; and 2003-2004 Volvo XC90, downstream.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated oxygen sensor design
• Specific fit for direct application matching
• 4-wire layout with rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for a cleaner replacement setup
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Part number 16488 for accurate ordering and catalog lookup

Product Details

Bosch 16488 uses advanced ceramic sensing elements and controlled heater operation to reach operating temperature quickly and maintain accurate lambda feedback once the engine is in closed-loop operation. As part of Bosch’s Actual OE Oxygen Sensor line, this replacement follows the same OE-focused engineering approach used in original equipment development, with attention to response speed, durability, and signal consistency under heat and vibration. This part cross-references Monroe Shocks & Struts (e.g., 8677894) for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings at the ECU
• Delayed closed-loop fuel control after startup
• Rough idle or drivability concerns tied to exhaust feedback
• Emissions test failures caused by a worn downstream sensor

Installation Notes and Tips

Verify downstream placement before installation and confirm the connector, thread size, and harness length match the original sensor. Use the 18 mm thread and threaded mounting specification to compare against the removed unit, and inspect the exhaust bung threads for damage or corrosion before tightening. On Volvo S60, S80, V70, XC70, and XC90 applications, routing the harness away from hot exhaust surfaces helps preserve sensor life.

Quality Assurance

Bosch has more than five decades of OE oxygen sensor development and supplies OE-proven sensor technology to the aftermarket. Bosch 16488 is built to the same standard-replacement expectations as the brand’s original equipment-focused sensor line.