There is never a particular piece that is the wrong one, but you can find out how to fix it.
There are three conditions that a solvable position must satisfy.
- The permutation parity must be even. This means that if you were to put the pieces in their correct locations by swapping pieces, the number of swaps you need must be even. If it is odd, then the position is not solvable using normal turns.
Your cube satisfies this condition. There is a 3-cycle of corners, and a 3-cycle of edges. Each 3-cycle would take 2 swaps to fix. This is 4 swaps all together, which is even.
- The corner orientations must be balanced. This means that if you were to fix the corner orientations by twisting them only clockwise, the total number of twist steps is a multiple of 3. If it is not a multiple of 3, then the position is not solvable using normal turns.
Your cube also satisfies this condition. Only two corners need to be twisted to make the last layer corners show yellow. One needs one twist step, the other two steps. This is 3 steps all together, which is a multiple of 3.
- The edge orientations must be balanced. This means that if you were to fix the edge orientations by flipping them one by one, the total number of flips is even. If it is not even, then the position is not solvable using normal turns.
Your cube fails this condition. There are three edges that need to be flipped to make the last layer edges show yellow, which is odd.
To fix your cube, you need to take out one edge piece (it does not matter which one, it may even be a currently solved one) and put it back in reversed. This will make your cube solvable again.