Hi. I have a 2013 Honda Accord Sport with 115k miles. Since September, my check engine light comes on 5 minutes after I fill up or when the tank gets down to 1/4. It goes off in a couple of days and stays off until I fill up again. My fuel mileage has also gotten terrible. I got it tested and the …

the fine folks at Autozone are not mechanics. They can sell you parts and tell you what codes your vehicle has, but do not listen to them for repair advice. You did good getting the code form them and going elsewhere. Supreme gas has no relevance on this issue. Check your owners manual for warra…

Thanks! I will have him check for an exhaust leak before I buy the sensors.

Hi again! So I got the sensors replaced, but the engine light is still on. It was actually off before he replaced the sensors, then it came on again about an hour or two after I left the shop. Also, my battery died twice Any ideas/suggestions? This is really bugging me, as I am planing to drive f…

[image] ndswizz84_160797: So I got the sensors replaced, but the engine light is still on. It was actually off before he replaced the sensors, then it came on again about an hour or two after I left the shop. Assuming the light is on for the same reason as before . . . P0420 . . . that would …

Have you switched back to regular gas? If not, do that and see if the light comes on after two tankfuls. BTW, be careful not to overfill the gas tank, always stop at the first click, never add any more. But that is not what is causing your current issue. Now that the O2 sensors have been replace…

The overfill check valve does not stop someone from overfilling their gas tank. It is supposed to stop the excess fuel from getting into the vapor recovery system, but when you over fill and then go bumping down the road, the valve can bounce open and closed allowing some raw fuel to get into the c…

[image] ndswizz84_160797: This is really bugging me, as I am planing to drive from Houston to Jacksonville, FL for the holidays. You might check on the cost of a rental . It might be expensive but so would a break down during the holidays.

Thanks for such a clear explanation. I read up on an ECU reset; don’t know if I want to try that. It is all a bit upsetting, though. I’m thinking of just going to trade it in so I don’t have to deal with this anymore. :woman_facepalming:t5:

Vent/Rollover Valve It provides a method of controlled escape for gasoline vapors during the refueling process. It has a mechanism which closes the vent in the event the vehicle rolls over, to prevent spilling of VOCs or fuel in general. It also acts as a fill limiter. Tester

Check engine light comes on after I fill up my gas tank

Maintenance/Repairs

Tester December 21, 2019, 10:00pm 8

You can’t overfill your gas tank.

The Onboard Refueling Vapor Recovery system has a component called an overfill check valve that prevents that from happening.

Tester

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Check engine light comes on after I fill up my gas tank

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