I have no CEL. Car runs perfect. Just had the coolant reservoir replaced. Any thoughts.

 

One simple thing to check is the gas cap. But the problem is more likely with the fuel filter and/or its connectors as it is mounted to the coolant reservoir. BTW, if there was no CEL, how did you realize there was a code thrown?

 

I scan my car one a week with the Duramtirc to see if there are any faults.

Thanks, I did clear the fault and tighten gas cap. It has not come back...

Thanks for your response.