My bmw x5 diesel 2002 not starting when engine has run for 30 or more minutes, and also sometime it does not start in the morning the battery is nearly dead. i have realised that even if i took the ignition of the er con will still work as you can hear the sound of the ventilator.

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: diyobd2.fr

what type of are you running in your car. it could be thick and hard for your cold engine to start.

If your fuel consumption is normal I don't think you have any worries.

no. I'd suggest to disconnect a battery for 15 mins, reconnect, wait for 5 mins and try to restart. If it doesn't help (sometimes there's a program block to prevent stealing equipment) call a dealer

Every car needs a heating engine time specially when its cold, I recomend like about 5 to 10 minutes after you start engine and before you change from P to D. If you try to start the engine first time in the morning, it's cold outside and you immediately go on run you are going to have this trouble every time. Every engine has it's operational standard temperature a 5 to 10 minutes working engine, car stopped, may guaranty this standard temperature and optimal function conditions, and also keeps a longer life of your car.

Good luck

If its a diesel?? I'd check the Positive crankcase Ventilator or PCV. These things oil up and the filter blocks. This can give the airflow meter some dodgy readings. Its good practice to eliminate these as a cause anyway and they should be changed every 3-4 oil changes anyway. You can buy the complete assembly from the UK for about $100 AuD but thats generally not necessary,just buy the filter only for $50 AuD and clean the body of the unit with degreaser. The actual filter is quite small and they are held in an an odd shaped plastic box at the rear of the engine, alongside the fuel injectors, held with four small hex headed bolts. You have to remove the engine top cover to see it. Fiddly but not a mental strain to achieve.

On the other hand, if its a petrol unit I'd try the fuel filter first, oh, and check that the car isn't running hot before you switch it off, excess engine bay heat maaaay be causing you some grief?

Happy Motoring.
Good luck

Hi we have a similar fault on a 2002 X5 diesel with 140k.km
scan test on 'Autologic' says > low fuel pressure in rail under starting< we have done leak off test at diesel specialist and they say it needs #4 and #2 injector renewing, the low pressure from tank is at spec at approx.3.4bar whereas the rail press at crank is only between 102bar to 140bar on 6 diff scans, where i believe it should be at around 390bar, hope this helps, we still have not fixed this yet,

check the map sensor and the idle speed sensor. check the fuel pressure at the engine. check all fuse and relay for proper operation

How long did you charge the battery? If was completely dead a five minute jump won't do it. Let battery JUMP charge for at least 20 minutes and have other person helping you do the jump rev his engine while you start the beamer.

the battery needs to be replaced or use heavy duty jumb leads and be carefull if you conect the leads the doors lock so have one open