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I replaced all of mind due to older index, if you got Index 5 index 8 or index 9 you should replace them all with index 11 or 12.
Old rule of thumb, once one goes the others will follow at some point. Just my 2 cents worth.
But yes you can just change the one injector if thats your only option.
I am not sure about yours, but mine new OEM from BMW were about $350 each, I ended up getting new/used ones for $75 each
Last edited by The Geezer; 07-08-2018 at 09:42 PM..
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