Oxygen Sensor Upstream Downstream 4Pcs - Reliable Fit for Ford Trucks

In this review of the Oxygen Sensor Upstream Downstream 4Pcs kit, the bottom line is straightforward: it is best for owners of older Ford, Lincoln, Mazda and Mercury vehicles who need an affordable, genuine-style replacement for worn O2 sensors. The reviewer found the sensors offer good build quality and a clear performance benefit when they match the original connector and fit. If the plug differs from the original part, however, the sensor will not fit, so careful comparison with your existing sensor is essential before purchase.

Key Features

• Replacement numbers: Covers a wide range of factory part numbers so buyers can match their original sensor for compatibility.
• Premium materials: Double laser-welded stainless steel construction and high temperature resistant materials increase durability and response time.
• Upstream and downstream coverage: The 4-piece kit replaces both front and rear sensors on many models to restore proper air/fuel monitoring.
• Performance focus: Designed to accurately detect air and fuel mixture to help maintain engine efficiency and performance.
• Warranty support: Includes a 12-month warranty for replacement or refund if the product is defective.

Who It's For

The kit is aimed at DIY mechanics and independent shops servicing older Ford E-Series, F-Series, Explorer, Expedition, Crown Victoria, Taurus and related Lincoln, Mazda and Mercury models that list the covered replacement numbers. It is a practical choice for drivers experiencing sluggish engine response or check engine codes tied to oxygen sensors who want a cost-effective repair.

It is not for buyers who cannot confirm connector type visually or by part number; the listing warns that if the plug differs from the original, the part will not fit. Owners of newer or less common models should verify fitment or choose a sensor explicitly matched to their vehicle to avoid returns.

Pros & Cons

Pros

• Well-built construction using stainless steel and high temperature materials for longer service life.
• Good value when replacing multiple sensors at once, restoring both upstream and downstream monitoring.
• Easy to install for most experienced DIYers and comes with a 12-month warranty for peace of mind.

Cons

• Compatibility is mixed in user reports; incorrect plug type will prevent installation and requires careful comparison to the original part.

Specifications

Brand	Gledewen
Included pieces	4 oxygen sensors (upstream and downstream)
Replacement numbers	15716, 15717, 15718, 15719, 15664, ZZC318861, XR3Z9G444CA, 234-4401, 234-4046
Material	Laser-welded stainless steel body, high temperature resistant components
Warranty	12-month replacement or refund
Intended vehicles	Selected Ford, Lincoln, Mazda, Mercury models (see fitment)

Our Verdict

The Oxygen Sensor 4-piece kit is a sensible, budget-friendly solution for owners of older Ford and related vehicles who can confirm the original connector type and part number. It offers durable construction, improved sensor response and a warranty, making it good value when fitment matches. Buyers who cannot verify plug compatibility should look for a factory-specific sensor to avoid installation issues.

Frequently Asked Questions

Will these sensors fit my vehicle?
Compare the original sensor plug and listed replacement numbers to the photos; if the plug differs, the sensors will not fit.

Do these replace both upstream and downstream sensors?
Yes, this 4-piece kit is intended to replace upstream and downstream sensors on compatible models.

What if a sensor fails after purchase?
The kit includes a 12-month warranty that covers replacement or refund if the sensor is defective.