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In the past 2 weeks, my 2005 9-3 2.0t Sedan has experienced intermittent power shut downs while driving. Twice while crusing at 75-80 mph on the highway and once while pulling out of retail center at 5 mph. All of the electrical system continues to work, but the check engine light comes on. If it sits for ~20 minutes it starts right back up. The mechanic had no tangible answers after the computer diagnostics were done. Any thoughts or ideas? I love this car and have never experienced any problems, but now I'm terrified to drive it!
 

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The CEL is on anytime the key is on and the engine is not running, so it is not necessarily indicative of any stored codes. It sounds like the best time to diagnose this problem is during the brief period of time that the engine will not restart after shutting down. Assuming that the engine cranks over OK after shutdown, that leaves us with either fuel or ignition issues. Unless you have a fuel pressure gage available with the correct fitting for our fuel rails, it's probably easier to first check for spark. Are you up to a little roadside wrenching? (also assuming that she will quit where it is safe to do so!)
 

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Fuel pump failures have been known to begin intermittently.

Try to listen for the fuel pump when you turn the engine to ignition, right before you crank it over.
 
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