CEL for gas cap

[k3tsurui]

When it comes to Honda's, there are two main reason for throwing that code. The gas cap is the easiest and cheapest fix, so I would change that out first just to eliminate it. The next time you fill up... listen carefully for the pshhhhhh (purge noise) from the gas tank when you first open the cap. If present, then it was the cap, if not, then it is the bypass solenoid valve under the car next to the gas tank. There are ways of testing this, but it is very involved and would be easier to show instead of described. I use to work at the Acura dealership and 9 times out of 10 ...changing out the solenoid will fix the problem. The thing is....it cost like 250 (not including installation cost).........for this much i could get a chipped p28, dup the map, and turn the ck light off for less....the 2 evap codes apply to the emissions system only and is independent to the car's electronic/fuel sys....it will not have an effect on the car's overall operation