NTK 22523 Oxygen Sensor - Downstream, Upstream or Upstream Front

Direct-Fit Oxygen Sensor

NTK Oxygen Sensor 22523 is a specific-fit, heated oxygen sensor built for direct replacement applications. It uses a threaded mounting type, a 4-wire design, and a 9.7500 wiring harness length for a precise installation profile.

Compatible with Mazda MPV, Mazda Protege, and Mazda MX-3 applications listed below, this NTK oxygen sensor is engineered for accurate exhaust feedback and OE-style fitment. The 18.000 thread diameter and heated sensor design support stable operation in emissions control systems.

Key Features

• Specific-fit oxygen sensor for direct replacement use
• Heated sensor design for faster operating response
• 4-wire configuration for the listed applications
• Threaded mounting type with 18.000 thread diameter
• 9.7500 wiring harness length

Fitment Details

• Fits 2000-2001 Mazda MPV, downstream. Located after catalyst; B1S3; Federal emissions; OE equivalent design; direct fit oxygen sensor.
• Fits 1999-2000 Mazda Protege, upstream. OE design oxygen sensor fits Bank 1 Sensor 1 for air/fuel ratio; direct fit oxygen sensor.
• Fits 1992-1995 Mazda MX-3, upstream front. Equivalent OE design oxygen sensor; direct fit oxygen sensor.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel ratio feedback in the exhaust system
• Emissions system faults tied to a worn sensor
• Slow or inconsistent sensor response
• Fitment issues from using a non-specific replacement part

Installation Notes

Use the listed year, make, model, and position details to confirm application before installation. This sensor installs with a threaded mount and is intended for the exact applications shown in the fitment table. Verify connector and harness routing against the original part before final assembly.

Quality Assurance

NTK is part of the NGK family of products and is a major original equipment oxygen sensor supplier. Each sensor is extensively tested during manufacturing to meet or exceed OE specifications for fit, form, and function. Part number 22523 is supported by NTK's OE application technology and market coverage.