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2013 Buick Lacrosse Limp Mode

dtst4t

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lacrosse
Hi,
Sorry if this has already been answered, I've been looking at the site and I don't believe so.. Anyway, this Buick goes into sporadic limp mode; I have 2 engine codes P0411 and P0651; already changed the crankshaft positioner sensor. Now I am a loss; The tach also sometimes shows nothing?? Anyone else have this problem.
Thanks
 
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