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There are two sensors on a 1999 Villager. The upstream sensor is located in the exhaust manifold at the front of the engine. It could be right on top mounted straight up or further down mounted sideways. The downstream sensor is located in the exhaust pipe right behind the catalytic converter. If you have a check engine light that comes on due to an indicated O2 sensor fault, the problem may not be the sensor itself. (Keep in mind that the upstream sensor actively monitors the air/fuel ratio and sends a variable feedback signal to the PCM. The PCM uses the downstream sensor for the catalyst monitor system and does not affect the air/fuel ratio). Check the wiring from the O2 sensor to the PCM for shorts or open wires. Check for proper voltage from the sensor by back probing the connector with a straight pin. Turn the ignition ON but do not start the engine. Connect a DIGITAL voltmeter TO a good ground and the positive lead (usually the center wire) of the O2 sensor SIGNAL wire at the connector. It should give a reading between 400 and 450 millivolts (.40 to .45. volts). If not, trace and repair the circuit. CAUTION: DO not probe the wires of the O2 sensor or the harness as the circuit is very sensitive to excessive circuit loads or circuit damage of any kind.
What else can I help you with?
How many oxygen sensors are there on a 1999 Mercury Villager?
There are two.
Where is the oxygen sensor in 1999 mercury villager?
The oxygen sensors are in the exhaust pipes on most models.
Where is the oxygen heater sensor located on a 1999 Mercury Villager sport?
Both oxygen sensors are in the exhaust pipe, one under the front of the engine, one roughly under the passenger seat are.
How many oxygen sensors on 1999 Mercury Sable?
Four
Would like to find Location of speedometer cable on 1996 Mercury villager?
would like to know where the speedometer sensors are on a 1999 villager
Where thermostat 1999 villager?
How do you change the thermostat in 1999 Mercury Villager
Will a 2001 mercury villager 3.3 fit in a 1999 mercury villager?
Yes.
Where is the O2 sensor located on 1999 mercury villager?
There are two oxygen sensors, one in the exhaust near the engine, one in the exhaust pipe after the second converter, roughly under the passenger seat on OBD-II vehicles.
How many gallons does the gas tank on a 1999 Mercury Villager Hold?
According to the 1999 Mercury Villager Owner Guide : ( 20.0 US. gallons )
Where is the crankshaft on a 1999 mercury villager 3.3?
In the engine.
What refrigerant is used in a 1999 Mercury Villager?
134-A
Can you put headers on a 1999 mercury villager?
No, no room.
