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I get a check engine light when I accelerate hard or after the fan comes on. Any thoughts
 

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Signature says they have a 535xi and I'm unaware of any of those for E60's having an N55. You need to scan for codes and tell us what you've got. I'm guessing a 30FF underboost code since it seems so common under acceleration, but we really have no clue until you scan it and get us a real code.
 

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I get a check engine light when I accelerate hard or after the fan comes on. Any thoughts
I have many thoughts, mostly sexual.
CEL indicates error codes stored. Use a BMW-specific code reader to obtain the codes and go from there.
 
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