You don't, you replace or rebuild the engine.
2000 Mercury sport villager with 3.3liter what does the rod caps torque at.
Unplug the sensor and unscrew it from the exhaust pipe. You'll probably need a special socket to do it without damaging the wires.
Under the dash near the fusebox.
How do you change the thermostat in 1999 Mercury Villager
Yes.
Probably around $200 for the tank, and $200 for labor.
According to the 1999 Mercury Villager Owner Guide : ( 20.0 US. gallons )
This is as complex procedure. I suggest you buy a repair manual if it is not obvious to you, and you don't have experience.
In the engine.
No, no room.
134-A