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I have a 2005 9-3 linear sports sedan. I recently bought the car and he told me it wasn’t running right and showed me that if you disconnect the battery and hook it back up it will run good. So I paid for the car and literally five minutes down the road the check engine light came on and after I shifted into 3rd it stopped making full boost and didn’t have much power I can’t complain because I got a great deal on the car but I’m stumped on what the problem could be
 

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Discussion Starter #2
Also the cruise control doesn’t work. I know that some vehicles including my truck use vacuum for the cruise control so is it maybe a vacuum leak is that even how it works?
 

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Cars don’t go into limp without codes.
 

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Check engine light = codes .. simple
and sometimes u have codes even without it lit, but not the other way around!
 

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Half boost, provided u dont have codes, check boost leaks, check PCV valve, check bypass valve ..
 
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