Bosch 13273 Oxygen Sensor - Downstream

Bosch Actual OE Oxygen Sensor 13273

Bosch 13273 is a narrow-band heated oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management for downstream applications on select Nissan and INFINITI vehicles, including the 1997 INFINITI I30 and 1997 Nissan Maxima.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated design for faster closed-loop operation
• Specific-fit sensor with 4-wire harness and square male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Wiring harness included for direct replacement use

Product Details

Bosch 13273 uses a switching-type oxygen sensing element to measure exhaust oxygen content and send accurate feedback to the engine control unit. Bosch developed this OE sensor line from its original oxygen sensor technology and later planar narrowband designs, focusing on quicker light-off, improved lambda accuracy, and faster closed-loop response. For drivers servicing a downstream oxygen sensor on a 1997 Nissan Maxima or 1997 INFINITI I30, this part number 13273 provides the OE-style fit and signal behavior expected in standard replacement service.

This part cross-references 226A00L703 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel ratio feedback to the ECU
• Rough combustion control caused by a slow or aging sensor
• Higher exhaust emissions from degraded sensor response
• Delayed closed-loop fuel control after sensor wear

Installation Notes

Verify the connector shape, wire count, thread size, and downstream position before installation. Bosch 13273 is a specific-fit, threaded sensor with a 4-wire harness and male square connector, so matching the original sensor configuration is important for proper installation on the 1996 Nissan Maxima and 1997 Nissan Maxima, as well as the 1997 INFINITI I30. Use the correct oxygen sensor socket for the 22 mm hex and confirm the exhaust bung thread size is 18 mm.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development and aftermarket supply experience. The sensor uses ceramic elements, controlled heater operation, and heat-resistant materials to maintain consistent signal quality under thermal and vibration load.