Bosch 13838 Oxygen Sensor - Downstream or Upstream Left

Bosch Oxygen Sensor for Mazda Applications

The Bosch Validated Oxygen Sensor 13838 is an emission control sensor for specific Mazda applications. It is listed for upstream left and downstream positions, including Mazda Millenia, Mazda 626, and Mazda MX-6 fitments.

Key Features

• Bosch Validated Oxygen Sensor line
• Part number 13838
• Fits 2001-2002 Mazda Millenia, upstream left
• Fits 1997 Mazda 626, downstream
• Fits 1997 Mazda MX-6, downstream
• Located after the secondary converter on listed 1997 applications

Detailed Description

Bosch 13838 is an oxygen sensor for emission control service on select Mazda vehicles. The Bosch Validated Oxygen Sensor line identifies applications that have been checked for fitment and application accuracy, making this part a direct match for the listed positions on the Mazda Millenia, Mazda 626, and Mazda MX-6. Use Bosch 13838 when replacing a sensor in the upstream left location on 2001-2002 Mazda Millenia or the downstream location on 1997 Mazda 626 and 1997 Mazda MX-6.

This part cross-references no additional part numbers in the provided data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced emissions control efficiency
• Fault codes tied to upstream left or downstream sensor circuits
• Sensor replacement for Mazda 626 and Mazda MX-6 exhaust service

Installation Notes and Tips

Confirm the sensor position before installation. The listed 1997 Mazda 626 and Mazda MX-6 applications are downstream sensors located after the secondary converter. Verify connector style, harness routing, and exhaust thread condition before installing Bosch 13838.

Quality Assurance

Bosch Validated Oxygen Sensor 13838 is cataloged for the exact Mazda fitments shown above, including 2001-2002 Mazda Millenia and 1997 Mazda 626 and Mazda MX-6 applications.