Welcome to the WERKZ.......pick yourself up a Bently service manual.....it has most of all you needs as far as service & repair.......
p.s. another helpful link..... BMW E46 DIY (Do It Yourself) BMW Service Manual BMW Repair Manual Bentley - 3 5 & 7 Series X5 ( E36 E30 E34 E32 E46 E39 E53)
BMW Service Manual: 3 Series & M3 (E46) 1999-2005
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Published by: Bentley
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This BMW E46 3 Series manual provides the highest level of clarity and completeness for all service and repair procedures. Enthusiasts, do-it-yourselfers, and professional technicians will appreciate the quality of photos and illustrations, theory of operation, and accurate step-by-step instructions. If you're looking for better understanding of your E46 BMW, Bentley is the recommended choice of all BMW enthusiasts.