Bosch 13773 Oxygen Sensor - Downstream Right

Bosch Validated Oxygen Sensor for Hyundai Santa Fe

Bosch Part Number 13773 is a specific-fit, narrow-band heated oxygen sensor for the downstream right position on 2003-2006 Hyundai Santa Fe models. It provides direct air-fuel-ratio feedback to the ECU for stable closed-loop fuel control and emissions monitoring.

Key Features

• Specific-fit Bosch Validated Oxygen Sensor for the downstream right location
• Narrow-band heated O2 sensor with 4-wire configuration
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Square male connector with blade terminals
• Wiring harness included for a direct replacement-style installation
• Built with high-temperature-resistant materials for demanding exhaust conditions

Product Details

Bosch 13773 is part of the Bosch Validated Oxygen Sensor line, a product line focused on OE-style replacement coverage and application-specific fitment. Bosch developed its oxygen sensor technology over decades of OE engineering, including narrowband planar designs that improve warm-up response and closed-loop switching behavior. This sensor is built with a ceramic sensing element, controlled heater operation, and durable metal housing to maintain accurate signal output under heat and vibration. For Hyundai Santa Fe oxygen sensor replacement needs, Bosch 13773 supports precise downstream monitoring on 2003, 2004, 2005, and 2006 vehicles.

This part cross-references 3921039660 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings reported to the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to downstream sensor faults
• Rough fuel control caused by a worn or contaminated sensor

Installation Notes and Tips

Verify the downstream right location before installation on your Hyundai Santa Fe. The sensor uses a threaded mount with an 18 mm thread diameter, so the exhaust bung should be clean and undamaged before threading in the replacement. Confirm connector shape, terminal count, and harness routing against the original sensor to ensure proper connection and clearance away from exhaust heat.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket application experience. The Bosch Validated Oxygen Sensor line is built to OE-proven standards for accurate signal output, stable heater performance, and durable operation in harsh exhaust environments.