2008 Saab 9-3 Questions

All 2008 Saab 9-3 Questions

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Hi, we had a terrible storm and now my check engine light is on after driving through puddle. What do I need to check. Thank you very much.
The other day the light was on but it rode ok. The mechanic thought it was just a loose gas cap and reset the sensor.
my husband has heard it on several occasion but i have not..i always preheat my car for at least 10 minutes whereas he will get in it ice cold and take off...he thinks its something with the throw bearing or something...
p300 codes....302,303,305,306..multiple cylinder misfires..believe bad gas problem cause began a day after i filled up...vibrating and shaking upon accelerating but drives smooth when speed is maintained...idles rough...