See also:

AT OIL TEMP warning light (AT models)
If this light illuminates when the engine is running, it may indicate that the automatic transmission fluid temperature is too hot. If the light illuminates while driving, immediately stop ...

Brake booster
The brake booster uses engine manifold vacuum to assist braking force. Do not turn off the engine while driving because that will turn off the brake booster, resulting in poor braking power. The brak ...

Tire chains
Tire chains cannot be used on your Impreza, WRX and STI because of the lack of clearance between the tires and vehicle body. ...