HTMXJA Oxygen O2 Sensor Kit 4-Pack for Ford/Mazda 3.0L–3.7L (Upstream & Downstream) — OE Fit, Plug-and-Play

HTMXJA 4Pcs upstream and downstream oxygen sensors are direct-fit replacements designed to restore accurate air-fuel monitoring for compatible Ford and Mercury V6 engines.

These four oxygen (O2) sensors—two upstream and two downstream—match OEM specifications for a range of 3.0L–3.7L Ford and Mazda vehicles from model years 2010–2016. Built to the OE reference numbers 234-5038 and 234-4490, the set provides the sensing elements and connectors needed to return your vehicle's emissions feedback to factory-like performance. Whether you’re addressing a check-engine light, poor fuel economy, or an emissions test failure, this kit is made for technicians and DIYers who want a straightforward installation without modifying wiring or harnesses.

Which vehicles will these oxygen sensors fit?

The HTMXJA sensors are engineered to fit various Ford, Mercury and Mazda models equipped with 3.0L–3.7L V6 engines. Fitment covers Edge, F-150, Mustang, Explorer, Escape, Fusion, Flex, Taurus, Transit series, Lincoln MK models, Mercury Milan/Mariner, Mazda CX-9 and others listed by year and displacement. Always confirm your vehicle’s OE number and engine size before ordering.

• Edge (3.7L, 3.5L) model years 2011–2014
• F-150 (3.7L) 2011–2014; Explorer (3.5L) 2011–2015
• Escape/Fusion (3.0L) 2010–2012; CX-9 (3.7L) 2011–2015
• Lincoln/Mercury/Transit/other compatible V6 applications specified in product details

How do these sensors affect engine performance and fuel economy?

Oxygen sensors provide the engine control unit with exhaust oxygen data so fuel trim can be adjusted for efficient combustion. Replacing failing or aged sensors helps the ECU make correct fueling decisions, which can improve throttle response and reduce wasted fuel. These HTMXJA sensors are built to deliver consistent voltage response and reliable readings comparable to OEM parts.

• High-precision sensing element for stable oxygen readings
• Restores accurate closed-loop fuel control to reduce fuel waste
• Helps avoid downstream catalytic converter damage from incorrect air-fuel ratios

Are these sensors easy to install, and what comes in the kit?

The set includes four pre-wired sensors matched to upstream and downstream positions with OE-style connectors for a plug-and-play replacement. Installation generally requires basic hand tools and an oxygen sensor socket; no splice or adapter is needed when matched to the listed vehicles. Follow common safety steps: let the exhaust cool, disconnect the battery, and torque to manufacturer specifications.

• Four sensors (upstream and downstream) with OE-compatible plugs
• No cutting or wiring splices required for listed models
• Recommended tools: O2 sensor socket, ratchet, anti-seize for threads if needed

What warranty and part information should I check before buying?

HTMXJA provides a six-month limited warranty on these sensors; confirm fitment by matching your vehicle’s existing OE part numbers 234-5038 or 234-4490. Inspect connectors and sensor thread size against your current parts to ensure compatibility, and contact the seller with your VIN if in doubt.

• Reference OE numbers: 234-5038 / 234-4490
• Six-month warranty from purchase date
• Verify vehicle model, year, and engine displacement before ordering

Who is this for: This 4-piece HTMXJA oxygen sensor kit is intended for owners and mechanics of compatible Ford, Lincoln, Mercury and Mazda V6 vehicles who need a complete upstream and downstream replacement. It's ideal for drivers troubleshooting emissions faults, restoring fuel efficiency, or preparing a vehicle for inspection—anyone seeking OE-style fitment and straightforward installation without custom wiring work.