O2 sensors are always located on the exhaust system.
on my 1999 ford mercury villager its on top of transmission under the van
remove and reinstall
In a 1998 Mercury Villager, the mass air flow sensor is located in the air intake tube. The air intake tube goes from the air box to the intake.
The speed sensor is not expensive and is easy to replace.
You don't as it does not have a cable. You replace the speed sensor instead.
i asked the question how would i know the answer
In the dashboard behind the small grill to the right of the steering column.
It should be the same.
According to the 1998 Mercury Villager Owner Guide ( 5W-30 ) is the preferred oil
10w30
The 3.0 litre V6 engine in a 1998 Mercury Villager has a timing BELT
R134