- 1). Park your Astra facing a flat vertical surface, such as a garage door, 25 feet away.
- 2). Turn on the headlights and prop open the hood.
- 3). Look for the two hexagon-shaped adjustment points behind the headlight you wish to adjust.
- 4). Insert your allen wrench into an adjustment point to change the vertical or horizontal aim of the headlight. Adjust the aim so that the headlight hits the ground where the ground meets the vertical surface the Astra is facing.
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