Made easy full test solution mention that 2d parity can detect 3 bit error, and correct 1 bit error.
i don't think that is correct,
reference - http://faculty.ycp.edu/~dhovemey/fall2005/cs375/lecture/11-16-2005.html
4 bit error
yes for n dimensional parity check scheme it can correct upto (n/2) errors as minimum distance is n+1.