If you own a 2004-2006 Saturn Ion Redline with a 2.0-liter engine and are experiencing a fluctuating idle or low idle the trouble might be due to a software glitch. With this condition a technician may not find any diagnostic trouble codes in the engine control module and the check engine light may or may not illuminate on the dash.
Despite the lack of evidence in the engine management system, updating the software might be the fix.
Ask your favorite technician to consider this the next time you take the car to his shop.
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