RANSOTO O2 Oxygen Sensor Set - 4-Pack for Ford F150/F250/F350 & More, Upstream/Downstream Replacement

These RANSOTO oxygen sensors are aftermarket replacements designed to match factory fit and electrical connections for a broad range of Ford-platform vehicles plus select Lincoln, Mazda, Mercury and Jaguar models. Sold as a set of four, the kit includes items that correspond to common part numbers (15717, 15716, 15718 and 15719) so you can replace upstream and downstream sensors together and reduce diagnosis time. Each sensor is built to plug into the existing harness and provide the feedback your engine control unit expects for fuel trim and emissions monitoring.

How do these sensors affect engine performance and diagnostics?

Oxygen sensors report exhaust oxygen levels to the vehicle’s computer, which adjusts fuel delivery and ignition timing accordingly. Replacing worn or failing sensors can improve drivability, reduce rough idling and clear fault codes tied to fuel mixture. While these sensors help the ECU make better decisions, outcomes depend on overall engine condition and proper installation.

• Direct replacement for common OEM part numbers to ensure correct signals.
• Tighter voltage response helps the ECU maintain proper air–fuel ratio.
• Replacing all related sensors reduces the chance of residual fault codes.

Which vehicles and part numbers are supported by this set?

This four-pack covers many Ford models including F-150/F-250/F-350, Explorer, Ranger and Escape, plus multiple Lincoln, Mazda, Mercury and select Jaguar/Aston Martin applications. It is intended to substitute listed OEM numbers, but you should confirm compatibility by checking your vehicle’s year, engine and existing sensor part number before buying.

• Replaces OEM numbers: 15717, 15716, 15718, 15719, 15664, ZZC318861, XR3Z9G444C.
• Fits Ford, Lincoln, Mazda, Mercury, Jaguar and some Aston Martin models — verify model year first.
• Sold as a set of four for upstream and downstream positions.

What should I expect during installation and maintenance?

Installation typically requires standard hand tools and possibly penetrating lubricant for older exhaust fittings. Each sensor is made to match the vehicle’s connector, but wire routing and heat shielding vary by model — follow a repair manual or OEM torque specs when fitting. After installation, clear any stored codes and perform a short drive cycle to let the ECU re-learn sensor characteristics.

• Check connector match and sensor thread size before tightening.
• Use anti-seize only if manufacturer guidance allows; some pre-coated designs are ready to install.
• Clear engine fault codes and drive to verify proper operation and emissions readiness.

Who is this for: technicians, DIY mechanics and owners of compatible Ford, Lincoln, Mazda, Mercury or Jaguar vehicles who need an economical, full set replacement of both upstream and downstream oxygen sensors. This kit is especially useful when multiple sensors show age-related performance loss or when replacing one sensor reveals others close to end-of-life. If you are unsure about fitment, compare the vehicle’s current sensor part number and connector to the product listing before purchase. RANSOTO backs the kit with a one-year warranty and direct customer support for fitment or quality concerns.