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Old 11-10-2012, 08:22 AM
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floydarogers floydarogers is offline
Pedant and Curmudgeon
Location: Renton, WA
 
Join Date: Oct 2010
Posts: 3,305
Mein Auto: 335d
The VANOS is an actuator on the front of the head, which drives the camshaft. The actuator can be changed easily (relatively - look for the DIY in the E46 section), but the parts connected to the camshaft/chain is harder.

The Valvetronic is integral with the head and valves. The eccentric drive motor is easy, but nothing else is - you have to dissamble the valvetrain.

Neither requires the head to be removed, but it's not easy; unless you're going to DIY it's probably better to buy a head.

What is broken?
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