The 2004 Ford Freestar SEL is equipped with a V6 engine, and it typically has two heated oxygen sensors (HO2S) due to its dual exhaust system. These sensors are also commonly referred to as oxygen sensors or O2 sensors. The specific details may vary depending on the exact engine and exhaust configuration of your vehicle.
- Bank 1 Sensor 1 (B1S1): This is the upstream oxygen sensor located before the catalytic converter on the side of the engine where cylinder 1 is located. It monitors the oxygen content in the exhaust gases before they enter the catalytic converter.
- Bank 2 Sensor 1 (B2S1): This is the upstream oxygen sensor located before the catalytic converter on the side of the engine where cylinder 2 is located. Similar to B1S1, it monitors the oxygen content in the exhaust gases before they reach the catalytic converter.
These sensors play a crucial role in monitoring the air-fuel mixture and helping the engine control module (ECM) adjust fuel delivery for optimal performance and emissions.
Please note that vehicle specifications can vary, and it's always best to refer to your vehicle's owner's manual or consult with a qualified mechanic to get accurate and specific information about the number and location of oxygen sensors in your particular 2004 Ford Freestar SEL.
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