Vauxhall ASTRA Owner's Manual page 274

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Dipped beam
1. Replace bulb through opening the front
wheel arch: turn relevant wheel to gain
access, release catch and remove
cover – see page 268.
2. Remove headlight protective cover.
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3. Rotate left bulb holder and disengage.
Self-help
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4. Remove the bulb holder with bulb from
the reflector.
269