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First, if it is throwing codes believed to be the timing chain issue, do not drive it. You could be one mile of driving from a ruined engine. Second, you don't say who the mechanic is. If he just pulled codes and said it's the chain I'd be leery. At a minimum he should have physically checked for chain slack with the engine warmed up (but not running). It can have slack when cold, but not when hot after the chain tensioner is filled with oil. If this person has never actually done an N20 timing chain job I'd also be leery. Even if he has, I'd maybe shop for better prices. Sometime people associated with Facebook BMW groups are aware of people who do these sorts of things on the side. My son has saved huge money this way.
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