Subaru 1998 Forester Owner's Manual page 93

Instruments and controls
B If the light comes on steadily:
If the light comes on steadily while driving or does not go out after the
engine starts, an emission control system malfunction has been de-
tected.
You should have your vehicle checked by an authorized SUBARU
dealer immediately.
NOTE
This light also comes on in the following cases:
D The fuel tank is completely empty.
D The fuel filler cap is not tightened until it clicks.
If the fuel tank is empty, refill the tank as soon as possiblle. If you have
recently refueled your vehicle, the cause of the CHECK ENGINE
warning light/malfunction indicator lamp coming on could be a loose
or missing fuel filler cap. Remove the cap and retighten it until it
clicks. Make sure nothing is interfering with the sealing of the cap.
Tightening the cap will not make the CHECK ENGINE warning light
turn off immediately. It may take several driving trips. If the light does
not go out, take your vehicle to your authorized SUBARU dealer
immediately.
B If the light is blinking:
If the light is blinking while driving, an engine misfire condition has
been detected which may damage the emission control system.
To prevent serious damage to the emission control system, you
should do the following:
D Reduce vehicle speed.
D Avoid hard acceleration.
D Avoid steep uphill grades.
D Reduce the amount of cargo, if possible.
D Stop towing a trailer as soon as possible.
The CHECK ENGINE warning light may stop blinking and come on
steadily after several driving trips. You should have your vehicle
checked by an authorized SUBARU dealer immediately.
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