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An ecommerce site I work on has around 16,000 URLs that are 404s in Webmaster Tools. The vast majority are for products that are no longer stocked by the site, which is a natural occurrence in ecommerce.

But my question is, could these possibly be harming rankings?

On an ecommerce site we have unique content on the product pages (i.e. descriptions), as well as the usual delivery and returns tabs for customer convenience. From this we haven't had any duplicate content issues or warnings, which seems to be the case industry-wide.

However, we're looking to add a more lengthy FAQs tab which is still highly relevant to the customer but contains a lot more text than the other tabs. The product descriptions are also relatively small. Do you think this will cause potential duplicate content issues or should it be treated the same as a delivery tab, for instance?

An ecommerce site I work on has around 16,000 URLs that are 404s in Webmaster Tools. The vast majority are for products that are no longer stocked by the site, which is a natural occurrence in ecommerce.

But my question is, could these possibly be harming rankings?