RANSOTO O2 Oxygen Sensor Set of 4 — Direct-Fit Upstream & Downstream Replacements, Restores Emissions and Fuel Trim

The RANSOTO O2 Oxygen Sensor set of 4 is a direct-fit upstream and downstream replacement designed to restore accurate oxygen readings and emissions performance on compatible Ford, Lincoln, Mazda, Mercury and Jaguar vehicles.

Whether you’re repairing a check-engine light related to an O2 sensor or replacing worn sensors during routine maintenance, this four-piece kit replaces several factory part numbers and fits a wide range of models. Each sensor is built for direct replacement of the listed OEM numbers—check your vehicle’s year and engine location before ordering to confirm fitment.

Which vehicles and part numbers does this sensor kit replace?

This RANSOTO set replaces multiple factory part numbers commonly found on older Ford, Lincoln, Mazda, Mercury and some Jaguar gasoline engines. The listing covers upstream (pre-catalytic converter) and downstream (post-catalytic converter) positions and matches several OEM references so it’s easy to cross-check with your existing sensor.

• Replaces part numbers: 15717, 15716, 15718, 15719, 15664, ZZC318861, XR3Z9G444C
• Common Ford applications: F-150, F-250, F-350, Ranger, Explorer, Mustang and more
• Lincoln and Mercury models: Town Car, Navigator, Aviator, Mariner, Milan and others
• Other compatible makes: Mazda 6, Tribute, B-series trucks and Jaguar S-Type

How do these sensors improve vehicle operation after installation?

Replacing failing oxygen sensors helps the engine control unit get correct exhaust oxygen readings, which supports better fuel trim decisions and smoother engine performance. While results depend on vehicle condition, fresh sensors commonly reduce false engine codes and stabilize idle and fuel delivery.

• Restores correct oxygen measurement for ECU fuel adjustments
• Reduces likelihood of check-engine lights tied to O2 readings
• Helps maintain expected emissions control behavior

Are these sensors straightforward to install and what should I check first?

These oxygen sensors are designed as direct-fit replacements for the part numbers listed, so installation typically follows the factory sensor’s mounting and connector arrangement. Before replacing, verify the exact sensor location (upstream or downstream), confirm the vehicle year and engine code, and inspect wiring harness condition for corrosion or damage.

• Confirm OEM reference and sensor position on your vehicle
• Inspect wiring and connector for heat or corrosion damage
• Use anti-seize on threads if recommended by the vehicle service manual

What warranty and support come with the RANSOTO O2 sensors?

RANSOTO backs this sensor set with a one-year warranty and a satisfaction guarantee. If the sensors fail to meet expectations or are incompatible, contact the seller for troubleshooting, replacement, or a return per the warranty terms.

• One-year limited warranty included
• Customer support for fitment or performance questions
• Return or replacement options if compatibility issues arise

Who this is for: This RANSOTO four-pack is geared toward DIY mechanics, independent repair shops, and vehicle owners maintaining older Ford, Lincoln, Mazda, Mercury and select Jaguar models who need an economical, direct-replacement solution for failing upstream and downstream oxygen sensors. Verify your vehicle’s model year, engine, and existing sensor part number before purchasing to ensure proper fitment and fast, hassle-free installation.