Ford OEM – (Front) O₂ Sensor – 2016-2018 Focus RS

Ford OEM – (Front) O₂ Sensor – 2016-2018 Focus RS

If you’ve got a 2016–2018 Focus RS and you’ve gone with a performance exhaust or catless downpipe, the front (upstream) O2 sensor becomes one of those parts you almost always end up replacing. This oxygen sensor sits before the catalytic converter and constantly monitors the oxygen content in your exhaust gases, feeding that data straight into the ECU. When the stock sensor starts giving bad readings or is mismatched from exhaust mods, it can lead to faulty AFR data, erratic RPMs, unstable tuning, and annoying check engine lights.

The Ford OEM Front Upstream O2 Sensor FV4Z-9F472-A is the genuine factory-original sensor designed for your RS’s 2.3L EcoBoost engine. It’s a direct plug-and-play replacement that restores accurate pre-cat oxygen monitoring so your ECU can dial in correct air-fuel mixtures and help keep your engine running cleanly whether you’re stock or tuned.

Key Features

• Factory-spec replacement: Genuine Ford part engineered to fit 2016–2018 Focus RS with exact OE connector, wiring, and calibration.

• Accurate AFR feedback: Measures exhaust oxygen content before the catalytic converter to ensure reliable air-fuel ratio inputs to the ECU for proper fueling and tuning.

• Prevents false CELs: Helps eliminate check engine lights and false diagnostic trouble codes linked to oxygen sensor misreads after exhaust mods.

• Durable OEM quality: Built to Ford’s standards for thermal and environmental performance in the harsh exhaust environment.

Application

Designed specifically for the Front / Upper upstream oxygen sensor position on FORD Focus RS 2016, 2017, and 2018 2.3L EcoBoost models.

Application

Fits Ford Focus RS 2016-2018 2.3L EcoBoost vehicles as the upstream (primary) O2 sensor (before the catalytic converter).

Why EMS?:
We source this part directly from Ford OEM channels—no aftermarket knockoffs. You get factory specs, reliable performance, and total fitment confidence

Need help with installation?
If you’d like to schedule an O2 sensor install, give us a call at (423) 500-4901 or email sales@emsinc-tn.com and we’ll get you set up.

Call us (423) 500-4901 or

Email us at sales@emsinc-tn.com

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