Bosch 15327 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Mazda 626

Bosch Engineered Oxygen Sensor 15327 is a direct-fit emission control sensor for select Mazda 626 applications. It supports upstream exhaust monitoring for 2000-2002 Mazda 626 models, including California-emissions coverage on the 2000 application.

Key Features

• Bosch Engineered Oxygen Sensor line for emission control service
• Upstream oxygen sensor position
• Fits 2001-2002 Mazda 626, upstream
• Fits 2000 Mazda 626, upstream, with California Emission System
• Part number 15327 for application matching

Application Details

This Bosch oxygen sensor 15327 is used to monitor exhaust oxygen content before the catalytic converter, helping the engine control module manage fuel delivery and emissions performance. It fits 2000-2002 Mazda 626, upstream, with the 2000 Mazda 626 listing specifically noted for California Emission System coverage. This part cross-references Bosch Engineered Oxygen Sensor 15327 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor faults
• Incorrect air-fuel mixture readings
• Reduced fuel control from a failing upstream sensor
• Emission test failures tied to sensor performance
• Slow or inaccurate exhaust oxygen feedback

Installation Notes

Verify the upstream sensor location before ordering and match the vehicle year, make, model, and emission package exactly. For Mazda 626 oxygen sensor replacement, confirm connector style and exhaust placement against the original part. Use the part number 15327 to confirm application fitment before installation.

Quality Assurance

Bosch Engineered Oxygen Sensor parts are built for emission control service and application-specific fitment. Bosch 15327 is listed for the Mazda 626 upstream position across the confirmed model years shown above.