NTK 22090 Oxygen Sensor - Upstream

NTK Direct Fit Oxygen Sensor for Mazda 626

Restore accurate exhaust feedback with the NTK Direct Fit Oxygen Sensor, part number 22090. This heated, specific-fit sensor is built for the 1998-2000 Mazda 626 upstream location in the front manifold, including Federal Emissions applications for the 2000 model year.

NTK Direct Fit Oxygen Sensors are part of NTK’s OE-focused product line, with application coverage and fitment engineered for import and domestic vehicles. The sensor uses a 4-wire, threaded design with an 18 mm thread diameter and a 19.75-inch wiring harness length for direct replacement service.

Key Features

• Direct fit oxygen sensor for specific applications
• Heated sensor design for faster operating response
• 4-wire configuration
• Threaded mounting type with 18 mm thread diameter
• 19.75-inch wiring harness length
• Upstream placement for front manifold installation
• OE-style fit, form, and function for Mazda 626 service

Fitment Details

Fits 2000 Mazda 626, upstream, located in front manifold; B2S1; Federal Emissions; OE MFR: NTK.

Fits 1998-1999 Mazda 626, upstream, located in front manifold; B2S1; OE MFR: NTK.

This part cross-references Bosch 15323 and DENSO Auto Parts 234-4041 for the same application.

What It Helps Solve

• Check engine light caused by a failing upstream oxygen sensor
• Incorrect air-fuel ratio feedback to the engine control module
• Reduced fuel control from a slow or inaccurate sensor signal
• Emissions test failure related to oxygen sensor performance
• Rough idle or drivability issues tied to exhaust sensor faults

Installation Notes

Install in the upstream position at the front manifold on the listed Mazda 626 applications. Verify connector routing, harness length, thread size, and emissions configuration before installation. Use the vehicle’s exact year, engine setup, and emissions equipment to confirm the correct replacement.

Quality Assurance

NTK is a major original equipment oxygen sensor supplier, and its sensors are manufactured with ceramic technology control from raw material through finished product. Each sensor is extensively tested during production to help ensure quality and reliability that meet or exceed OE specifications.