Vehicle Compatibility
Compatible with select:
Ford Fusion
- 2016
- 2017
- 2018
- 2019
- 2020
Engine Compatibility:
- 1.5L L4 Turbocharged
Includes:
- Upstream Oxygen Sensor
- Downstream Oxygen Sensor
Reference Part Numbers:
- 234-8039
- 234-5172
Always confirm engine size and VIN compatibility before ordering because Ford enjoys changing sensor configurations with absolutely no concern for human happiness.
Interchange Part Number: 234-5172, DS7Z9F472B (Upstream) / 234-8039, FB5Z9G444A, GK4Z9G444D, HS7Z9G444A, FB5Z9G444C, GK4Z9G444E (Downstream)
What Do Oxygen Sensors Do?
Oxygen sensors monitor exhaust gases and provide feedback to the ECU so it can adjust:
- Air/fuel ratio
- Fuel trims
- Emissions output
- Catalytic converter efficiency
Upstream Sensor
Located before the catalytic converter and responsible for fuel mixture control.
Downstream Sensor
Located after the catalytic converter to monitor emissions system performance.
When either fails, your ECU basically starts improvising.
And ECUs are surprisingly dramatic under pressure.
Fitment For: 2016-2020 Ford Fusion 1.5L L4 Turbocharged
[Easy Installation]:Plug and Play design for direct replacement and simplicity of installation,Performs in addition to or better than OE
Common Symptoms of Bad O2 Sensors
Failing oxygen sensors can cause:
- Check engine light
- Poor fuel economy
- Rough idle
- Sluggish acceleration
- Turbo hesitation
- Failed emissions testing
- Rich fuel smell
- Increased exhaust emissions
And occasionally your Fusion starts driving like it personally resents being turbocharged.
[Service Guaranteed]:one hundred% satisfaction aftersale services and products and technical assistance.You probably have any questions, contact with us, we will be able to reply you in 24 hours and be offering the solve approach for you.
[Warranty]:1 Years. (Make stronger fuel potency & Stable performance & Durable)
Key Features
Complete 2-Sensor Kit
Replacing both sensors together helps:
- Restore balanced exhaust monitoring
- Improve ECU response
- Reduce future sensor-related issues
- Simplify maintenance
OEM-Style Direct Replacement
Designed for plug-and-play style installation on compatible Ford Fusion applications.
Heated Sensor Design
Integrated heating elements help sensors reach operating temperature faster for:
- Better cold-start efficiency
- Faster ECU feedback
- Reduced startup emissions
- Improved drivability
Because emissions systems now have approximately the same complexity as early space programs.
Benefits of Replacing Your O2 Sensors
Installing new upstream and downstream sensors may help:
- Restore fuel economy
- Improve throttle response
- Reduce turbo hesitation
- Eliminate CEL codes
- Improve idle smoothness
- Reduce emissions output
And maybe stop your dashboard from glowing like a disappointed Christmas tree.
Installation Notes
Typical installation process:
- Disconnect battery
- Remove old oxygen sensors
- Install replacements
- Reconnect wiring harnesses
- Clear fault codes
Using an oxygen sensor socket is highly recommended unless your preferred repair strategy includes rounded-off hardware and creative profanity. Need a DIY article on how to replace your Fusion oxygen sensor? Check it out here.
Final Thoughts
The 234-8039 & 234-5172 O2 Oxygen Sensor Kit is a smart maintenance upgrade for aging Ford Fusion 1.5L EcoBoost models experiencing check engine lights, poor fuel economy, or emissions-related issues.
Replacing both sensors together helps restore proper ECU operation and keeps your turbocharged Fusion running smoother, cleaner, and more efficiently.
Because nothing says “modern turbo ownership” quite like replacing sensors before they begin negotiating with the ECU.
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