Bosch 15437 Oxygen Sensor - Downstream

Bosch OE Oxygen Sensor for Infiniti G20

Bosch 15437 is a specific-fit, narrow-band heated oxygen sensor for downstream use on select Infiniti G20 applications. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate lambda monitoring, and lower emissions under changing operating conditions.

Built as part of Bosch’s Actual OE Oxygen Sensor line, this replacement follows OE-style design and materials for dependable signal response and consistent operation in demanding exhaust temperatures. It is a direct-fit option for 2000 Infiniti G20 and 2001 Infiniti G20, downstream, including 2001 Infiniti G20, downstream, to 12/2000.

Key Features

• Bosch Actual OE Oxygen Sensor line for OE-style replacement
• Part number 15437 for downstream Infiniti G20 applications
• Narrow-band heated oxygen sensor with 4-wire configuration
• Threaded mounting with 18 mm thread size and 22 mm hex
• Square male connector with blade terminals
• Specific-fit design with wiring harness included
• Metal housing and high-temperature-resistant construction

How Bosch OE Sensors Perform

Bosch developed its oxygen sensor technology from early thimble-style designs to later planar narrowband sensors that respond faster and reach operating temperature sooner. Bosch 15437 uses that OE development background to deliver stable sensor output, quicker closed-loop operation, and reliable exhaust feedback for the ECU. For buyers searching for a downstream oxygen sensor for 2000-2001 Infiniti G20, Bosch 15437 offers a direct replacement built around the original application requirements.

This part cross-references 226A07J402 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the engine control unit
• Slow sensor response during closed-loop operation
• Emissions test failures tied to oxygen sensor readings
• Rough combustion control caused by degraded sensor output

Installation Notes and Tips

Confirm the downstream location before installation and verify the connector shape, terminal count, and thread size against the original sensor. The threaded 18 mm design and 22 mm hex support standard oxygen sensor service procedures, and the included wiring harness helps match the OE-style connection layout. Always inspect the exhaust bung threads and wiring routing before final tightening.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience. The Actual OE Oxygen Sensor line is built to the same type of engineering standards used by vehicle manufacturers, with ceramic sensing elements, controlled heater operation, and durable materials for consistent performance in harsh exhaust conditions.