The knock sensor is in the engine V under the intake manifolds and coolant crossover pipe. As it requires considerable disassembly and an expensive new gasket set to reach it, I suggest you make very sure there is something wrong with it first. You will have to remove the upper and lower intake manifolds and coolant crossover pipe assembly to reach it. Just because you are receiving a trouble code for it does not mean there is anything wrong with it. This sensor shares a circuit with other components that often will set a "ghost" trouble code.
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.
i have been working on one lately myself i have been trying to figure out. i cannot help on were the crank is yet, but, i do know the knock sensor is under the intake about dead center, you do have to take off the upper and lower both off totaly. I do also know that the knock sensor is not cheap either.
The speed sensor is not expensive and is easy to replace.
O2 sensors are always located on the exhaust system.
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.
No, because it probably wouldn't work in any other location. Just because you are receiving a trouble code for it does not mean there is anything wrong with it. This sensor shares a circuit with other components that often will set a "ghost" trouble code.
It should be the same.
that the knock sensor does