vintagejoe Posted July 22, 2005 Share Posted July 22, 2005 This CEL and same code has been re-apearing for 3-4 months. I've had it looked at 4 times. A few days after it's been reset, it's back! Periodically, my car has run roughly----but the light appears even when it's running okay. 1. What should I do? 2. Is there a way to test the gas cap before I buy a new one? 3. Has anyone else had this problem? Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted July 24, 2005 Share Posted July 24, 2005 what car is this on? also, I haven't really heard of code 400. Is it just a generic evaporative emissions code? Quote Link to comment Share on other sites More sharing options...
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