Originally Posted by
manlaw38
I bought a new gas cap in summer has been fine but now it is cold gas icon flashing when I start car to keep battery charged. Perhaps the seal on the new gas cap is not seating like original. I didn't have to replace cap just did it to keep up on maintenance on an old car.
Flashing means problems with the EVAP system. In time, the condition will set a DTC code and the "CHECK ENGINE" light will light. At that point, you can read the code - it will be one of these, which will point you in a direction to look. A 442 or 445 can be the gas cap. If you bought an off-brand cap with a seal that is not as thick or soft as the OEM one, you won't get the seal the system expects and a leak will be the result.
