Why my BMW e46 320d cranks but wont start?

If Your BMW E46 320D cranks but don't start, You've likely got one of a few different things happening. The most common failure on this model that displays those symptoms is the fuel pump, so that's worth considering. Some other possible causes are a damaged ignition module, a bad crank position sensor, bad spark plugs, or another electrical failure. If You haven't already done so, You ought to try to see if there are any diagnostic fault codes (DTCs) that Your car's giving You. Sometimes, that'll tell You Your problem quite simply. Occasionally, You'll also find that Your vehicle is just out of fuel; this seems rather obvious, but if that's Your issue, it's a cheap fixAnd it'll save You from a ton of work that just leads to a face palm.