The US Attorney's office and the DOJ did investigate the IRS for this practice, but keep in mind Yates was confirmed in 2015 as this investigation was wrapping up - and she was initially appointed by Bush. They didn't find enough evidence to charge anyone with any crimes though.
http://www.cnn.com/2014/07/18/politics/irs-scandal-fast-facts/
Fast and Furious? Uh, yes, they did.
http://www.cnn.com/2013/08/27/world/americas/operation-fast-and-furious-fast-facts/
Yes, Holder was guilty as hell for lying about his knowledge of the operation, but in the end, nobody is brought up on charges. What's odd about this is how after three years of DOJ stalling on turning over documents to Congress, nothing has ever come of turning those documents over, and it's been 3 years. And again, Yates had nothing to do with that either - she was confirmed as Deputy AG in 2015 after being US Attorney in GA since 2010.