How many O2 sensors does a Ford Fusion have?
In most Ford Fusion models, you’ll find two O2 sensors on four-cylinder engines and four on V6 engines. The exact number depends on the engine and exhaust layout.
Oxygen sensors monitor exhaust emissions and engine performance by measuring oxygen levels before and after the catalytic converter. The Fusion's sensor count reflects whether it has a single bank (inline-4) or two banks (V6). We'll break down the typical configurations by engine type and model year.
Two-sensor setup on inline-four engines
For four-cylinder Fusions, the standard setup includes two O2 sensors: one before the catalytic converter (upstream) and one after it (downstream).
- Upstream (pre-cat) O2 sensor
- Downstream (post-cat) O2 sensor
In four-cylinder models, two sensors monitor exhaust before and after the catalytic converter, which is common in many modern cars.
Four-sensor setup on V6 engines
For Fusion models equipped with a V6 engine, expect four O2 sensors: two upstream and two downstream, one on each exhaust bank.
- Bank 1 upstream
- Bank 1 downstream
- Bank 2 upstream
- Bank 2 downstream
This arrangement allows emissions control and engine management systems to monitor both exhaust streams independently.
Variations by model year and market
Most North American Fusions from the mid-2000s through the 2010s follow the two- or four-sensor pattern described above, but some model years, trims, or regional variants may differ with specific exhaust configurations or sensor layouts. When in doubt, consult the vehicle’s service manual or locate the sensors physically near the exhaust manifolds and catalytic converters for confirmation.
Summary
In short, a Ford Fusion typically has two O2 sensors for four-cylinder engines and four for V6 engines. Always verify with your specific model year and engine code to be certain.
