Does the fuel cap normally click?

[sdhildebrand]

I recently bought a used 2012 A6, and a CEL appeared shortly after with code P0456 for a small EVAP leak.

In the course of checking everything that would normally cause the fault, I was checking the fuel cap and realized that although it states "Tighten Until One Click", mine never actually "clicks", it just stops turning and then sort of springs back 1/8 of a turn or so. It feels tight and I had never given it any thought until now, so the question I am wondering is, does this fuel cap normally "click" or is what I have described the normal function of this cap?

I would love if I could resolve this code with a new fuel cap, but don't to waste $60 if the cap I have is fine. Thanks!

[ENV²]

They don’t click like the old ones but the cap gasket might be an issue.


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[Audibot]

Mine clicks once I believe; agree with the gasket probably being the issue.

[VinnysS4]

Turn it until it "clicks". It kinda has a position like an ignition switch does. Closed and then CLOSED with a partial click.

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[sdhildebrand]

Turn it until it "clicks". It kinda has a position like an ignition switch does. Closed and then CLOSED with a partial click.

Thanks. That’s a perfect description of how mine is. So it seems that is it’s normal function.

[VinnysS4]

Thanks. That’s a perfect description of how mine is. So it seems that is it’s normal function.

Absolutely. Yeah it sounds normal. I would check the seal on the cap to see how it looks. Other than that, a smoke test is really the only way to narrow it down . If you have a big boy scanner you can do a purge and seal test to see if the tank holds pressure. If it doesn't, you likely have either a bad cap or a stuck open purge valve or Leak detection pump leak.

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[Valpo A7]

Clean the sealing area of the cap and filler neck and see if that makes it go away. If not then probably a new cap is needed.

You can get a cap off Amazon for under $20.