NTK 22510 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor

NTK 22510 is a direct fit heated oxygen sensor built for specific applications and engineered for threaded installation. It is a fitment-based replacement for the downstream sensor on select Mazda Protege models, with the harness length and 4-wire design matched to the application.

• Heated oxygen sensor for faster operating response.
• Specific-fit design for direct replacement use.
• Threaded mounting with an 18 mm thread diameter.
• 34.75-inch wiring harness length for application matching.

Application Details

Fits 1999-2003 Mazda Protege, downstream. This NTK 22510 oxygen sensor is intended for the downstream location on compatible Mazda Protege vehicles and follows an original-equipment equivalent design. The 4-wire heated configuration supports accurate exhaust monitoring, while the threaded mount helps ensure proper installation in the designated sensor port.

This part cross-references DENSO Auto Parts (e.g., 234-4751) for the same application.

Common Replacement Issues

• Check engine light related to oxygen sensor performance.
• Faulty downstream exhaust gas monitoring.
• Incorrect air-fuel feedback from a worn sensor.
• Slow sensor response caused by aging internal elements.

Installation Notes

Verify the downstream location, connector style, thread diameter, and harness length before installation. Use the vehicle’s original routing path to keep the lead away from hot exhaust components and moving parts. Confirm the sensor seats fully in the threaded bung and that the wiring is secured after installation.

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.