Bosch 18034 Oxygen Sensor - Downstream

Bosch Oxygen Sensor for Downstream Control

Bosch Part Number 18034 is a specific-fit, narrow-band heated oxygen sensor built for downstream exhaust monitoring. It delivers accurate air-fuel-ratio feedback to the ECU, helping maintain stable combustion control and lower emissions in the vehicles listed below.

Compatible with 2009-2011 Chevrolet Aveo and Aveo5, 2009-2010 Pontiac G3, 2009 Pontiac G3 Wave, and 2009 Suzuki Swift+, this Bosch Engineered Oxygen Sensor is a direct replacement for the original downstream sensor location.

Key Features

• Specific-fit oxygen sensor for downstream applications
• Narrow-band heated design for faster closed-loop operation
• 4-wire configuration with square male connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Wiring harness included with 13.2 in harness length
• Metal housing and high-temperature-resistant construction
• Bosch Part Number 18034 for OE-style replacement service

Product Details

Bosch Engineered Oxygen Sensor products are developed from decades of OE oxygen sensor engineering, beginning with Bosch’s original sensor designs and later narrowband planar technology. This Bosch 18034 sensor uses advanced ceramic elements and controlled heater operation to improve response time and maintain accurate lambda measurement under heat and vibration. For drivers searching for a downstream oxygen sensor for 2009-2011 Chevrolet Aveo or 2009-2010 Pontiac G3, this part provides the correct specific-fit configuration.

This part cross-references 1821384Z60 and 96951720 for the same application.

What This Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Reduced emissions monitoring accuracy
• Slow sensor response during closed-loop operation
• Faults caused by worn heater or sensing elements

Installation Notes and Tips

Verify the downstream position and connector style before installation. This sensor uses a threaded mount, 18 mm thread size, and a square 4-pin male connector, so matching the original connector and harness routing is important. Inspect the exhaust bung threads and wiring path for heat damage before installing the new sensor.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The design reflects Bosch’s focus on accurate sensing, durable heater control, and reliable performance in demanding exhaust conditions.