See also:

Tire chains
CAUTION Tire chains cannot be used on any tires for your Legacy and Outback because of lack of clearance between the tires and vehicle body. ...

Trailer safety chains
Always use safety chains between your vehicle and the trailer. Towing a trailer without safety chains could create a traffic safety hazard if the trailer separates from the hitch due to ...

If the light illuminates steadily
If the light illuminates steadily while driving or does not turn off after the engine starts, an emission control system malfunction has been detected. You should have your vehicle checked by an auth ...