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Wednesday while driving to work the gas cap light came on, after work it was off. Then the next day my check engine light came on and has been on since. I got the codes from the auto parts store and they said it had two codes: 1) P0455 & 2) P0442. VW wants $140 bucks to check everything but I was wondering if I should just try replacing the gas cap first and see if that fixes it before I shell out Dealership prices. Oh and when putting the cap back on it doesn't click anymore. Anyone have this happen before? (my car is a 2010 Beetle) Does the check engine light automatically go off if the problem is fixed or does a mechanic need to reset it? Any advice would be greatly appreciated!
 

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http://wiki.ross-tech.com/wiki/index.php/16839/P0455/001109

http://wiki.ross-tech.com/wiki/index.php/16826/P0442/001090

Most common problems are the gas cap or purge valve. Both of those parts are not expensive; see if they fix the issue and if not, have a shop diagnose it or try to troubleshoot it yourself.

Fuel cap. Fuel Tank Cap. . Exc.Tether; Incl.Tether
2.5 liter; COUPE,; COUPE, 2.5 liter; Exc.Tether; Incl.Tether.
1C0201550AD
$36.05

CHECK VALVE. DIVERTER VALVE. PURGE CONTROL VALVE. PURGE SOLENOID. SOLENOID. VACUUM REGULATOR. Vapor Canister Purge Solenoid.
06E906517A
$30.00


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I know this is an old post, but we are having the exact same issue. First the gas light and then the check engine the next day, went to O'Reilly and got the same codes. No other issues, running fine. Not sure whether to try the gas cap first or the purge solenoid. Would rather not replace both. Which part fixed the problem for you?

Editing to add that it's a 2009 Beetle...
 

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What year (2009), model, engine and trans, does your New Beetle have?

What scan tool are you using; a factory level scanner, like VCDS, can do output testing, to confirm things, like the purge valve is working (clicking during the out put test mode) or check out the below video, for testing tips? VCDS, can also; force the readiness testing and testing the evap system, confirm, it is working and whether or not, there are leaks in the system.


 

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As noted above; both of the typical failure parts, are not expensive (N80 purge valve; gas cap) and so, you could throw the parts cannon at it and buy new parts, hope for the best or diagnose the issue.

However, if you have a VW scan tool; you could try to diagnose the problem intelligently, following tips shown in the Humble Mechanics video above.

For the gas cap; it is common, for the gas cap seal to get old, rubber cracks and starts leaking. You could test the cap but the tool, is more expensive, then buying a new cap or you could just replace the seal, sold by RKXTech.

 
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