So long as you haven't modified your Ford Superduty's engine in anyway,
you'll have no trouble passing the California smog test. It's true, there is a difference with California legal and Federal legal emission requirements.
And, for the most part California is stricter. However, a USED vehicle which
has all the Federal required emission components (diesel or gasoline powered), can pass the California smog inspection process and be registered in California.
posted by SmogTips Support