Bosch 16378 Oxygen Sensor - Downstream or Upstream

Reliable Oxygen Sensor for Cadillac, Pontiac, and Saturn Vehicles

The Bosch Actual OE Oxygen Sensor 16378 is designed specifically for select Cadillac CTS, Pontiac G8, and Saturn Vue models. This narrow-band heated oxygen sensor ensures accurate emissions control and optimal engine performance by providing precise air-fuel mixture data to the vehicle’s engine management system.

• Brand: Bosch
• Brand Line: Actual OE Oxygen Sensor
• Part Number: 16378
• Wiring Harness Length: 13.6 inches
• Overall Length: 16.9 inches
• Terminal Type and Quantity: 4-pin female terminals
• Connector Shape: Oblong, female connector
• Mounting Type: Threaded with 18 mm thread diameter
• Sensor Type: Narrow-band heated oxygen sensor
• Housing Material: Metal with steel finish
• Hex Size: 22 mm for installation
• Wiring Harness Included

About the Bosch Actual OE Oxygen Sensor Line

The Actual OE Oxygen Sensor line from Bosch is engineered to meet original equipment specifications for precise fit and function. This product line focuses on delivering reliable sensor performance with standard replacement grade quality, ensuring compatibility and durability for specific vehicle applications such as the Cadillac CTS, Pontiac G8, and Saturn Vue. The 16378 sensor maintains factory-level emissions control and engine efficiency.

Product Details and Specifications

This Bosch oxygen sensor features a 4-wire heated design that allows for faster sensor warm-up and improved accuracy in measuring exhaust oxygen levels. The threaded mounting type with an 18 mm thread diameter and 22 mm hex size facilitates straightforward installation. The oblong female connector with four terminals ensures secure electrical connections. The sensor’s metal housing with a steel finish provides durability under high-temperature exhaust conditions. The included wiring harness measures 13.6 inches, with an overall length of 16.9 inches from sealing surface to connector end, designed for specific fitment in compatible vehicles.

Common Applications and Issues Addressed

• Restores accurate air-fuel ratio readings for engine control
• Helps resolve check engine light codes related to oxygen sensor failure
• Improves fuel efficiency by ensuring proper combustion
• Reduces harmful emissions by maintaining correct sensor feedback
• Prevents rough idling and engine performance issues caused by faulty sensors

Installation Notes and Tips

When installing the Bosch 16378 oxygen sensor, ensure the vehicle is cool to avoid burns. Use a 22 mm oxygen sensor socket for removal and installation. Verify the sensor’s wiring harness routing matches the original to prevent damage or disconnection. Thread the sensor carefully to avoid cross-threading and tighten to manufacturer torque specifications. The included wiring harness and connector are designed for a specific fit on Cadillac CTS, Pontiac G8, and Saturn Vue models, so confirm compatibility before installation.

Quality Assurance and Warranty

Bosch oxygen sensors are manufactured to meet strict quality standards for durability and performance. The Actual OE Oxygen Sensor 16378 is a standard replacement grade part that undergoes rigorous testing to ensure reliable operation. While specific warranty details may vary, Bosch typically offers coverage against defects in materials and workmanship, providing confidence in the sensor’s long-term functionality.