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Eh, you might be kind of screwed on that one unfortunately. I'd maybe look on ebay or something for some take-offs or go to a junk yard and take them out of one there if you want them cheap.
 

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I just bought new o2 sensors off eBay and paid like 40 bucks for both fronts in the store it's 48 a piece so to be honest ur best bet is to just get new Bosch 15717 off of eBay they range from 15-30 bucks brand new. Also if you don't replace the rears at all you will still throw a code and when ur engine light comes on it throws ur car into "safe" mode which richens the af ratio so it would be of your best interest to just spend 60 bucks or so and just get all 4 new o2 sensors plus its am added bonus that its something you know you won't have to replace for a Long time.
 

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There is deff no way to go without the fronts you need them to monitor the air fuel ratio you can go without the rears with a tune but will still throw a code for incomplete circuit u still have to complete the circuit or you will throw a code . The only thing turning the rear o2 off does is keeps you from throwing a cat code if your running an o/r pipe.
 
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