NTK 22115 Oxygen Sensor - Upstream Front

Direct Fit Oxygen Sensor for Mazda 6

NTK 22115 is a direct fit heated oxygen sensor built for specific applications, including the 2003-2008 Mazda 6 upstream front position. It uses a threaded mounting design and a 4-wire configuration to match the original sensor layout for Bank 2, Sensor 1 service.

As part of NTK’s Direct Fit Oxygen Sensor line, this replacement follows OE-style fitment and application coverage for import and domestic vehicles. NTK 22115 is engineered for the Mazda 6 oxygen sensor location listed below and is cross-referenced to Bosch 15430 and DENSO Auto Parts 234-4398 for the same application.

Key Features

• Direct fit oxygen sensor for specific vehicle applications
• Heated sensor design for faster operating readiness
• 4-wire construction for OE-style signal and heater circuit layout
• Threaded mounting type with 18 mm thread diameter
• 48.5 in. wiring harness length
• Fits 2003-2008 Mazda 6, upstream front

Detailed Description

NTK 22115 is an oxygen sensor from NTK’s Direct Fit Oxygen Sensor line, a product family focused on OE application coverage and original-style replacement fitment. NTK manufactures oxygen sensors with ceramic-based technology and extensive production testing to support fit, form, and function that align with OE specifications. For Mazda 6 service, this sensor is listed for the upstream front position on 2003-2008 models, specifically Bank 2, Sensor 1.

Use NTK 22115 when replacing a worn or failing upstream oxygen sensor on the Mazda 6. The direct fit design helps match the factory connector and mounting style, reducing the need for application changes during replacement. This part number, 22115, is also referenced by Bosch 15430 and DENSO Auto Parts 234-4398 for the same vehicle application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from the upstream sensor
• Slow sensor response during closed-loop operation
• Fault codes tied to Bank 2, Sensor 1 oxygen sensor readings
• Emissions test failure caused by a degraded upstream sensor

Installation Notes and Tips

Confirm the vehicle year, engine configuration, and sensor position before ordering. This NTK 22115 oxygen sensor is listed for the upstream front location on the 2003-2008 Mazda 6, so verify Bank 2, Sensor 1 placement against the original part before installation. Inspect the harness routing and connector condition during replacement, and compare the threaded mounting style and wire length to the removed sensor.

Quality Assurance

NTK is a major original equipment oxygen sensor manufacturer, and this Direct Fit Oxygen Sensor line is manufactured and tested to meet or exceed OE specifications for application accuracy and reliability.