OK here goes I have a dumb-*** friend who put diesel in my LR3 Drained it changed the 02 sensor still cannot get my vehicle to crank please help me what can I do.

 

Engine not cranking is electrical. Check battery voltage and the big fuse on the front of battery

 

Define crank, if it wont spin then as GB says its an electrical issue. If it just wont fire then it still has diesel in the rail,injectors,filter and lines.

 

As long as there is diesel in the system it will not start. Typically you would want to put clean fuel in the tank, remove the spark plugs, and turn the key as if to start. This will purge the remaining diesel from your fuel system. Clean/replace spark plugs as needed, and reinstall. Engine should start, but may be rough at first. Consider adding some sort of fuel system cleaner to tank to finish cleaning it out.