Bosch 18193 Oxygen Sensor - Downstream Left

Bosch Oxygen Sensor for Transit-150, Transit-250, Transit-350

Bosch Engineered Oxygen Sensor 18193 is a direct-fit, heated narrow-band O2 sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit replacement for downstream left applications on select Ford Transit vans, including Ford Transit-150, Ford Transit-250, Ford Transit-350, and Transit-350 HD.

Key Features

• Direct fit oxygen sensor for specific applications
• Heated narrow-band design for faster closed-loop operation
• 4-wire configuration with square female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with high-temperature-resistant construction
• Wiring harness included for the listed application
• Fits downstream left position on select Ford Transit models

Product Details

Bosch 18193 is part of the Bosch Engineered Oxygen Sensor line, a product family developed from Bosch OE oxygen sensor technology and refined through decades of emissions-control engineering. This sensor uses a switching-type narrow-band design to report exhaust oxygen content to the engine control unit, helping maintain stable combustion control and emissions performance across changing operating conditions. For drivers and repair shops servicing Ford Transit-150, Transit-250, Transit-350, or Transit-350 HD models, Bosch 18193 provides a direct replacement for the downstream left location with the correct connector, harness length, and threaded mount.

This part cross-references GK4Z9G444A for the same application.

What This Oxygen Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Slow closed-loop response after sensor aging or contamination
• Emissions test failures tied to downstream sensor faults
• Rough combustion control caused by inaccurate exhaust readings

Installation Notes and Tips

Compatible With 2016-2019 Ford Transit-150, downstream left; 2016-2019 Ford Transit-250, downstream left; 2016-2019 Ford Transit-350, downstream left; and 2016-2019 Ford Transit-350 HD, downstream left. Verify the connector shape, 4-wire layout, and threaded sensor location before installation. The sensor uses an 18 mm thread size and a 22 mm hex, so the correct oxygen sensor socket or wrench is recommended. Confirm the downstream left position on the vehicle before replacement.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emissions and engine management systems. The Bosch Engineered Oxygen Sensor line is built to OE-style standards using advanced ceramic elements, optimized heater control, and durable materials for consistent operation under heat and vibration.