Bosch 13805 Oxygen Sensor - Downstream or Upstream

Bosch Validated Oxygen Sensor for Mitsubishi

Bosch Validated Oxygen Sensor 13805 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for select Mitsubishi Diamante and Eclipse applications, including upstream and downstream positions.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated sensor design for faster closed-loop response
• 4-wire configuration with rectangular female connector and pin terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included with 15.7 in harness length
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Bosch Validated Oxygen Sensor line backed by more than five decades of OE development

Product Details

Bosch part number 13805 uses a switching-type narrow-band design to measure oxygen content in the exhaust stream and send accurate feedback to the engine control unit. The heated sensor element helps the system reach operating temperature quickly, which supports faster sensor activity after startup and more consistent control during normal driving. Bosch Validated Oxygen Sensor 13805 is engineered with ceramic sensing elements, optimized heater control, and durable materials suited for thermal cycling and vibration.

This part cross-references Mitsubishi OE numbers MD177968 and MD319787 for the same application. It is a direct replacement choice for Mitsubishi Diamante and Mitsubishi Eclipse models where the listed fitment applies.

Fitment

• Fits 1999-2000 Mitsubishi Diamante, downstream, without California Emission System; Bosch Validated Oxygen Sensor
• Fits 2000 Mitsubishi Eclipse, downstream, without California Emission System; Bosch Validated Oxygen Sensor
• Fits 2000 Mitsubishi Eclipse, upstream, without California Emission System; Bosch Validated Oxygen Sensor
• Fits 1997-1998 Mitsubishi Diamante, downstream; Bosch Validated Oxygen Sensor
• Fits 1994 Mitsubishi Diamante, upstream, without California Emission System; Bosch Validated Oxygen Sensor
• Fits 1992-1993 Mitsubishi Diamante, upstream; Bosch Validated Oxygen Sensor

Common Issues This Sensor Can Address

• Faulty oxygen sensor readings that trigger check engine light concerns
• Unstable air-fuel mixture control during closed-loop operation
• Slow sensor response after startup or during temperature changes
• Emissions test failures related to inaccurate exhaust feedback
• Rough combustion control caused by a worn narrow-band sensor

Installation Notes

Confirm the vehicle position, emissions configuration, connector style, and thread size before installation. This Bosch 13805 uses a threaded mount, 4-wire harness, and rectangular female connector with male pin terminals. Inspect the exhaust bung and wiring route before fitting the sensor, and verify the harness length is sufficient for the intended upstream or downstream location.

Quality Assurance

Bosch Validated Oxygen Sensor 13805 is part of Bosch’s OE-focused oxygen sensor program, developed from decades of original-equipment engineering and aftermarket validation. The design emphasizes accurate lambda feedback, fast light-off, and durable operation under heat and vibration.