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Re: Oxygen Sensors
Which engine does your Taurus have? If it's not a SHO, you will have either a 3.0L 12V V6, 3.0L 12V V6 FFV, or a 3.0L 24V V6. If the 24V, there will likely be badges on the front fenders that say "24V DOHC." If the FFV, there will be FFV badges on the fenders and or trunk lid.
According to the factory service manual, it looks like both regular gasoline engines have 4 oxygen sensors. It would appear the FFV engine only has 2 HO2 sensors (no post-catalyst sensors), but that seems odd.
-Rod
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