- Ford Motor Company 1999 Mercury Villager Owner's Guide

Service engine soon

Your vehicle is equipped with a

computer that monitors the engine’s

emission control system. This

system is commonly known as the

On Board Diagnostics System (OBD

II). The OBD II system protects the

environment by ensuring that your vehicle continues to meet

government emission standards. The OBD II system also assists the

service technician in properly servicing your vehicle.

The Service Engine Soon indicator light illuminates when the ignition is

first turned to the ON position to check the bulb. If it comes on after the

engine is started, one of the engine’s emission control systems may be

malfunctioning. The light may illuminate without a driveability concern

being noted. The vehicle will usually be drivable and will not require

towing.

What you should do if the Service Engine Soon light illuminates

Light turns on solid:

This means that the OBD II system has detected a malfunction.

Temporary malfunctions may cause your Service Engine Soon light to

illuminate. Examples are:

1. The vehicle has run out of fuel. (The engine may misfire or run

poorly.)

2. Poor fuel quality or water in the fuel.

3. The fuel cap may not have been properly installed and securely

tightened.

These temporary malfunctions can be corrected by filling the fuel tank

with good quality fuel and/or properly installing and securely tightening

the gas cap. After three driving cycles without these or any other

temporary malfunctions present, the Service Engine Soon light should

turn off. (A driving cycle consists of a cold engine startup followed by

mixed city/highway driving.) No additional vehicle service is required.

If the Service Engine Soon light remains on, have your vehicle serviced

at the first available opportunity.

SERVICE

ENGINE

SOON

Instrumentation