The upstream 02 sensor in your 2.5 liter Ford Fusion is a vital part of your engine system. Your primary Fusion Oxygen Sensor is mounted in your exhaust header. It’s designed to analyze your exhaust fumes and report just how rich ( too much fuel ) or lean ( not enough fuel ) your engine is running. This four wire oxygen sensor is comprised of 2 heater wires, a ground wire and a signal wire.
When your Ford Fusion Oxygen Sensor is fouled or begins to fail, your engine computer won’t be able to properly correct your fuel trims. This can cause your engine to idle poorly, run rough or even cause your transmission to shift harshly.
Today I will be showing you how to replace your Fusion Oxygen Sensor in a 2014 2.5 liter equipped Fusion. This vehicle has a fouled front or primary 02 sensor, and you can replace this unit easily using hand tools.
Because the 2.5 liter engine in your Ford Fusion has the exhaust facing towards the rear, it’s a good idea to work on your car when it’s cold.
Symptoms of a failed Ford Fusion Oxygen Sensor
- Bad gas mileage
- Check Engine Light ON
- Harsh shifting transmission
- Black smoke from tailpipe
How to Replace your Ford Fusion 02 sensor
To begin replacing your Fusion primary 02 sensor, you will need a 22mm open end wrench or a 02 socket. You can rent an 02 socket from your local auto parts store or simply purchase a 22mm open end wrench.
Open your hood and locate the white four pin primary upstream 02 sensor harness. Pull up on the harness to free the Fusion oxygen sensor connector.
Depress the oxygen sensor and disconnect the upstream 02 sensor for your vehicle. Once you have the 02 sensor unplugged you can begin unscrewing the primary oxygen sensor.
Now that your primary Fusion Oxygen Sensor is unplugged, you can proceed to unscrew the 02 sensor. Take your 22mm open wrench and unscrew the upstream 02 sensor next.
Once you have the 02 sensor removed you can install your replacement Fusion oxygen sensor. Make sure to lightly apply a layer of anti-seize to the threads of the primary 02 sensor. Screw in the 02 sensor carefully so you don’t cross thread your exhaust piping.
And after you’ve installed your upstream 02 sensor replacement, you must use a OBDII scan tool to erase any stored DTC codes. This tool can help you remove any check engine light codes from your Ford Fusion dashboard.
Have any questions about our How To DIY guide to your 2014 Ford Fusion upstream 02 sensor? Leave them for us below and let us know!
Is the bank 1 sensor 1 on the driver or passenger side of my 2014 Ford fusion with 1.6L turbocharged direct injection engine?
Hi Angela, thanks for reading and commenting.
If you have the 1.6 Ecoboost engine, this 02 sensor will in fact be located at the back of your firewall. To see this better, open your Ford Fusion engine bay and take off the plastic engine cover to see your intake ( located at the front of your Fusion ) and the exhaust ( towards the rear of your Fusion )
Hope that helps!
Hi, I have a 2015 Ford Fusion that is giving a bank 1 sensor 2 error code. I believe this is indicating the sensor after the catalytic converter. Any ideas on where this is located? I have a fusion SE with 2.0L engine. Any help would be greatly appreciated.
Alex, the downstream Fusion 02 sensor is located in your catalytic converter, easily reached from underneath the vehicle
Good afternoon I have a 2014 Ford Fusion Titanium 2.0 Eco-boost.The location for the upstream O2 sensor
Michael, your upstream 02 sensor is located in your Fusion exhaust manifold sir.
The O2 sensor at the very top is not the down stream O2 sensor according to what you are saying and do these go bad as well.
Changing the 02 sensor on a 2012 Ford Fusion SEL. The sensor was very difficult to loosen and it took a very significant effort and some penetrating oil to get it loose. It is important to note that loosening the sensor was difficult/strenuous the entire loosening process. I fear that it was cross-threaded, possibly at the factory or by the previous owner. I did manage to get the sensor fully loosened BUT now it just spins and won’t come out of the the exhaust manifold. I can see most of the O2 sensor threads above the exhaust manifold, so it has come out almost the entire way. Thank you for any ideas on how to resolve this.
Sorry Adam, yeah the 02 sensor can be hard to remove. For BEST results, make as much clearance under your Fusion and use a really big breaker bar. It’s important to use as much impact and force to initially break it loose. To fix your Fusion 02 sensor issue, you should take your Ford to an exhaust shop. Buy a replacement 02 sensor, and have the exhaust shop drill a hole into the exhaust piping just a few inches before your existing location. Weld the 02 bung there, and install your new sensor and you are good to go.
Leave your old oxygen sensor in place and just cut the harness off.
Hope that helps!
I have a 2014 Ford Fusion SE with a 1.5 economist where is the upstream on it located?
Hi David,
The upstream Ford Fusion oxygen sensor is the one before the catalytic converter. Hope that helps!
Where is the upstream oxygen sensor at on a 2017 Ford Fusion eco boost with the 1.5
Hi Amanda, check your 02 housing that exits from the hot side of your turbocharger.
I have a 2008 ford fusion 4 cylinder. Where are the bank 1 oxygen sensors located?
Your upstream 02 sensors are located in your headers, should be very easy to find.
Where is the 2008 Ford Fusion SE V6 AWD upstream sensors located and where should I approach from the Change them both?
Hi there Patrick.
The Ford Fusion 02 sensors are installed into the exhaust manifolds of your engine. You will need to remove heatshields and engine covers in order to reach these. Hope that helps!