I wouldn't mind betting that you bought it for $20 - $40 instead of the realistic price of a couple of hundred dollars.

If the majority of customers  'don't know' what they are choosing to buy fakes, how do you propose eBay are suppose to go off and inspect said items once they are listed?

All buyers are in full control of what they buy and from whom

It's 'too late' after 30 days in any case

There are no warranties for the items you talk about

Buyers can choose not to buy from dodgy sellers in the first place

Or learn how eBay works

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@rv351 wrote:

I reported fake Bosch oxygen sensors which I confirmed with Bosch as fake. There are literally hundreds of scam seller's listing the same item.  You can't find any real ones listed. Items are good copies and majority of customers don't have a clue as give positive feedback. Products don't last but by the time it fails it's too late

eBay is well aware and take no action. Probably making half their turnover from counterfeit goods. 

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A bit like people who open up 6 year old threads,  are they fake as well