July 22, 200520 yr 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?
July 24, 200520 yr what car is this on? also, I haven't really heard of code 400. Is it just a generic evaporative emissions code?
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