Follow the exhaust from the cylinder head down the front of the engine. The O2 sensor should be near the bottom of the pipe just before it bends under the engine. It has three wires. The computer designates this as the heated or bank 1 sensor. The other sensor is further back the exhaust pipe under the car screwed into the intermediate or flex pipe. It may have three or four wires.
O2 sensors are always located on the exhaust system.
can you tell me where the knock sensor is located on a 3.3l mercury villager
The oxygen sensors are in the exhaust pipes on most models.
on my 1999 ford mercury villager its on top of transmission under the van
In the engine compartment
It is located in the distributor unit.
Your Villager has only one O2 sensor located on the front catalytic pipe before the converter. You should be able to look down between the engine and radiator and see it.
It is mounted to the rear of the throttle body.
On the EGR valve assembly.
There is no such part that I am aware of.
Both oxygen sensors are in the exhaust pipe, one under the front of the engine, one roughly under the passenger seat are.
Mass air flow sensor is mounted after the air filter.