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2006 Volkswagen Passat -CEL on and off

Why does the check engine light on my 2006 VW Passat come on for weeks then go off for months.

You’ll need to have someone with a code reader pull the stored codes from the computer for us. They will be in the form “Pxxxx”. If it’s more convenient, you can buy a code reader for about $20.00.

I,ve seen better.

See better WHAT?

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You’re not giving us much to work with

I can think of any number of components which could fail to operate properly, yet generate a code which commands the mil on, yet doesn’t seem to affect drivability