Take out the words <em>you</em> <em>should.</em><em> </em>Rewrite to say <em>Check</em><em> </em><em>the </em><em>air </em><em>pressure</em><em> </em><em>in</em><em> </em><em>your</em><em> </em><em>tires.</em>
Explanation:
Any other changes are much less obvious. Possibly, <em>Test </em><em>the </em><em>lights </em><em>and </em><em>turn</em><em> </em><em>signals </em><em>before</em><em> </em><em>you</em><em> </em><em>drive</em><em>.</em>
Technically, in imperative mood, the subject <em>you</em> is always understood, and could be eliminated. So the first two sentences could become; Take responsibility for making sure the car is safe to drive. Look at all of the following items: